The order, Polyzoa infundibulata, is divided into three suborders, coinciding very nearly with the Tubuliporina, Celleporina, and Vesicularina of the work above referred to, but as the characters of these suborders are derived from the conformation of the opening of the cell, I have thought it more convenient to name them accordingly. The first suborder, having a round, simple opening to the cell, is here termed the Cyclostomata; the second, with the opening of the cell filled up by a usually thin, membranous or calcareous velum, and with a crescentic mouth provided with a movable lip, the Cheilostomata; and the third suborder, which might perhaps include the Halcyonellea of Ehrenberg, as well as the Vesiculariadae, distinguished by the existence of a more or less well-marked fringe of setae (sometimes only rudimentary) around the opening of the cell when the animal is protruded, the Ctenostomata.
The following synoptical arrangement--which it must be remarked, includes only the genera occurring in the Rattlesnake collection--will serve to indicate the subsequent divisions.
SYNOPTICAL ARRANGEMENT OF THE POLYZOA INCLUDED IN THE RATTLESNAKE COLLECTION.
Suborder 1. CYCLOSTOMATA (Tubuliporina).
Fam. 1. TUBULIPORIDAE.
Gen. 1. Tubulipora.
Sp. 1. T. phalangea ?
2. Pustulipora.
2. P. australis, n. sp.
3. Idmonea.
3. I. radians.
Fam. 2. CRISIADAE.
4. Crisia.
4. C. denticulata.
5. C. acropora, n. sp.
Suborder 2. CHEILOSTOMATA (Celleporina).
§. 1. UNISERIALARIA.
Fam. 1. CATENICELLIDAE.
5. Catenicella.
a. fenestratae.
6. C. hastata, n. sp. ?
7. C. amphora, n. sp.
8. C. margaritacea, n. sp.
9. C. ventricosa, n. sp.
10. C. plagiostoma, n. sp.
11. C. lorica, n. sp.
12. C. cribaria, n. sp.
b. vittatae.
13. C. formosa, n. sp.
14. C. gibbosa, n. sp.
15. C. elegans, n. sp.
16. C. cornuta, n. sp.
17. C. umbonata, n. sp.
c. inermes.
18. C. carinata, n. sp.
6. Calpidium, n. g.
19. C. ornatum, n. sp.
Fam. 2. EUCRATIADAE.
7. Eucratea.
20. E. chelata.
8. Anguinaria.
21. A. spatulata.