to 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).

Sec.. 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.

Sec. 2. MULTISERIALARIA.
1. Articulata.
a. internodes elongated, multicellular.

Fam. 1. SALICORNARIADAE.
9. Salicornaria.
22. S. punctata, n. sp. ?
23. S. bicornis, n. sp.
24. S. dichotoma, n. sp.
25. S. marginata, n. sp.

Fam. 2. CELLULARIADAE.
10. Cellularia.
26. C. monotrypa, n. sp.
11. Scrupocellaria.
27. S. cervicornis, n. sp.
28. S. diadema, n. sp.
29. S. cyclostoma, n. sp.
30. S. ferox, n. sp.
12. Canda.
31. C. arachnoides.
b. internodes s