Hygrocrocis intestinalis, Val. Cyanophyceæ.
Filaments of a very minute Alga abound in the rectum of the Cockroach, where this species is said by Valentin to occur. The intestine of the Crayfish is given as another habitat. Leidy observes that the filaments which he found in the rectum of the Cockroach are inarticulate, and do not agree with Valentin’s description of the species.
Ref.—Valentin, Repert. f. Anat. u. Phys., Bd. I., p. 110 (1836); Robin, Végét. qui croissent sur l’Homme, p. 82 (1847); Leidy, Smithsonian Contr., Vol. V., p. 41 (1853); Bütschli, Zeits. f. wiss. Zool., Bd. XXI., p. 254 (1871).
Endamœba (Amœba) Blattæ, Bütschli. Rhizopoda.
Rectum.
Ref.—Siebold, Naturg. wirbelloser Thiere (1839) fide Stein; Stein, Organismus d. Infusions-thiere, Bd. II., p. 345 (1867); Bütschli, Zeits. f. wiss. Zool., Bd. XXX., p. 273, pl. xv. (1878); Leidy, Proc. Acad. N. S. Phil., Oct. 7th, 1879, and Freshwater Rhizopods of N. America, p. 300 (1879).
Gregarina (Clepsidrina) Blattarum, Sieb. Gregarinida.
Encysted in chylific stomach and gizzard; free in large intestine.
Ref.—Siebold, Naturg. wirbelloser Thiere, pp. 56, 71 (1839); Stein, Müll. Arch., 1848, p. 182, pl. ix., figs. 38, 39; Leidy, Trans. Amer. Phil. Soc., Vol. X., p. 239 (1852); Bütschli, Zeits. f. wiss. Zool., Bd. XXI., p. 254 (1871), and Bd. XXXV., p. 384 (1881); Schneider, Grégarines des Invertébrés, p. 92, pl. xvii., figs. 11, 12 (1876).