| (a) General. |
|---|
| 1743. | Baker,
"An attempt towards a natural history of the Polyp"* (London). |
| 1744. | Trembley, "Mémoires pour servir à l'histoire d'un
genre de polypes d'eau douce"* (Paris). |
| 1755. | Rösel Von
Rosenhof, "Insecten-Belustigung: iii, Hist. Polyporum." |
| 1766. | Pallas,
"Elenchus Zoophytorum." |
| 1844. | Laurent,
"Rech. sur l'Hydre et l'Eponge d'eau douce" ("Voy. de la Bonite,
Zoophytologie"). |
| 1847. | Johnston, "A History of the British Zoophytes" (2nd
edition). |
| 1868. | Hincks,
"History of British Hydroid Zoophytes." |
| 1872. | Kleinenberg, "Hydra. Eine Anatomisch
Entwicklungsgeschichtliche Untersuchung." |
| 1882. | Jickeli,
"Der Bau der Hydroidpolypen," Morph. Jahrb. viii, p. 373. |
| 1887. | Nussbaum, "Ueber die Theilbarkeit der lebendigen
Materie. II. Mittheilung. Beiträge zur Naturgeschichte des Genus Hydra,"
Arch. mikr. Anat. Bonn, xxix, p. 265. |
| 1891. | Brauer,
"Über die Entwicklung von Hydra," Zeitschr. wiss. Zool. Leipzig, lii, p.
169. |
| 1892. | Chun,
"Cœlenterata (Hohlthiere)," in Bronn's Thier-Reichs II
(2). |
| 1905. | Downing,
"The spermatogenesis of Hydra," Zool. Jahrb. (Anat.) xxi, p.
379. |
| 1908. | Brauer,
"Die Benennung und Unterscheidung der Hydra-Arten," Zool. Ann. xxxiii,
p. 790. |
| 1909. | Frischholz, "Biologie und Systematik im Genus
Hydra," Braun's Annal. Zool. (Würzburg) iii, p. 105. |
| 1910. | Berninger, "Über Einwirkung des Hungers auf Hydra,"
Zool. Anz. xxxvi, p. 271. |
| (b) Asiatic References. |
| 1894. | Richard,
"Sur quelques Animaux inférieurs des eaux douces du Tonkin
(Protozoaires, Rotifères, Entomostracés)," Mém. Soc. zool. France, vii,
p. 237. |
| 1904. | Von
Daday, "Mikroskopische Süsswasserthiere aus Turkestan," Zool.
Jahrb. (Syst.) xix, p. 469. |
| 1906. | Annandale, "Notes on the Freshwater Fauna of India.
No. IV. Hydra orientalis and its bionomical relations with other
Invertebrates," J. Asiat. Soc. Bengal (new series), ii, p. 109. |
| 1906. | Annandale, "The Common Hydra of Bengal: its
Systematic Position and Life History," Mem. As. Soc. Bengal, i, p.
339. |
| 1907. | Annandale, "Notes on the Freshwater Fauna of India.
No. X. Hydra orientalis during the Rains," J. Asiat. Soc. Bengal
(new series), iii, p. 27. |
| 1907. | Annandale, "Notes on the Freshwater Fauna of India.
No. XI. Preliminary Note on the occurrence of a Medusa (Irene
ceylonensis, Browne) in a brackish pool in the Ganges Delta and on
the Hydroid Stage of the species," J. Asiat. Soc. Bengal (new series),
iii, p. 79. |
| 1907. | Willey,
"Freshwater Sponge and Hydra in Ceylon," Spolia Zeylan. Colombo, iv, p.
184. |
| 1908. | Annandale, "Observations on specimens of
Hydra from Tibet, with notes on the distribution of the genus in
Asia," Rec. Ind. Mus. ii, p. 311. |
| 1910. | Powell,
"Lessons in Practical Biology for Indian Students" (Bombay). |
| 1910. | Lloyd,
"An Introduction to Biology for Students in India" (London). |
| Aboral
(or basal disk) | The disk by means
of which a free polyp attaches itself to external objects. |
| Cnidoblast | The
living cell of the nematocyst or nettle-cell (q. v.). |
| Cnidocil | A minute
bristle that projects on the surface in connection with a nettle-cell
(q. v.). |
| Column | The upright
or potentially upright part of a polyp (q. v.). |
| Ectoderm | The
external cell-layer of the body-wall. |
| Endoderm | The
internal cell-layer of the body-wall. |
| Green
(chlorophyll) corpuscles | Minute green
bodies contained in cells of polyps or other animals and representing a
stage in the life-history of an alga (Chlorella). |
| Mesoglœa | The
intermediate, gelatinous layer of the body-wall. |
| Nettle-cell
(nematocyst) | A cell capsule full of
liquid in which an eversible thread is coiled up. |
| Oral disk | The
eminence that surrounds the mouth and is surrounded by
tentacles. |
| Peristome | See "oral
disk." |
| Polyp | An individual
cœlenterate of simple structure that is fixed temporarily or
permanently by one end of a more or less cylindrical body and possesses
a mouth at the other end. |
| Tentacles | Filamentous outgrowths (in Hydra hollow) of the
body-wall round the mouth. |
Class HYDROZOA.