116 CLASS III. 
Polyps numerous, sessile, prehensile organs with simply spiral 
nettle-nodes. Bracts claviform with special prehensile organs small, 
knotted. At regular distances below the swimming column a 
collection of polyps with all these appendages surround the stem. 
Note.—In no other genus of Physsophoride are feelers met with on the 
part of the stem which supports the swimming bells. 
Stephanomia uvaria LESSON belongs to this genus: KOELLIKER, Die 
Schwimmpolypen, s. 18. See GEGENBAUER’S description of a complete 
specimen of it, and figure, Zeitschrift fiir wissensch. Zool. V. 8. 319—324. 
Pl. xvuii. fig. 1. 
Family II. Mippopodide. Colonies of swimming Polyps, 
without swimming bladder, with short common stem, the swim- 
ming column not formed of bells. 
Hippopodius Quoy and Gaim. Escuscu. The swimming 
column formed of bracts in two rows, and covering one another 
imbricately, with filiform short stem, to which the polyps with 
their prehensive and sexual organs are attached. 
Sp. Hippop. luteus, Ann. des Sc. nat. K. 1827, 8. 172, 173, Pl. Iv. A. 
GurERINn Iconogr., Zooph. Pl. xix. fig. 4.—Hippopod. neapolitanus Konun. 
Die Siphon. pp. 28—31. Tab. vi. figs. 1—5. 
Vogtia KOELL. 
Sp. Vogtia pentacantha Konut. Die Siph. von Messina, s. 31, 32. Tab. 
Vill. 
Family IV. Diphyide. Locomotive apparatus of the colony 
two distinct cartilagineo-gelatinous transparent pieces affixed to the 
upper part of a thin cylindrical common stem. The stem begin- 
ning in the substance of the anterior piece passes in a groove of the 
posterior between the two, and then gives attachment to groups 
consisting of a single polyp and its appendages. | 
This family includes certain marine animals, transparent as glass, 
which swim by means of the contraction of hollow organs filled 
with water ; it has the genus Diphyes for its type, which was first 
formed by Cuvisr in the first edition of his Régne Animal, rv. p. 61. 
This genus rested on a species discovered by Bory DE Sarnt- 
Vincent at the beginning of this century (1801), in the South 
Atlantic Ocean, and described under the name of Salpa bipartita ; 
see his Voyage dans les quatre principales tles des Mers d’ Afrique, 
