ACALEPH 2. 119 
the upper part of the stem, undergo remarkable metamorphoses after their 
first appearance as buds until they attain the cubical form, when the group 
of which it forms a part exactly resembles a young Budoxia cuboides, Quoy 
and Gaim. See also GHGENBAUER Zeitsch. fur wiss. Zool. V. 8. 292—295. 
Praya Lesson. The two swimming pieces of the colony nearly 
similar and equal, the covers of the developed groups bounded by 
round surfaces above and concave beneath. 
Sp. Praya diphyes Luss., KoELLiKer Die Siphon. von Mess. s. 33—36, Taf. 
1x.—Praya maxima GEGENB. Zeitsch. f. wissensch. Zool. V. 8. 301—309, Taf. 
Xvu. fig. 1—6. 
The genera Mudowxia, Hrsea, Aglaisma Escuscu., which have 
only a single polyp, have been termed monogastric diphyide by 
Huxtey ; but it is almost certain that they are not independent 
genera. It has been noted above, when treating of Abyla penta- 
gona, that a single group of this compound diphyes exactly resem- 
bles Hudoxia cuboides; and here the groups have been seen to 
detach themselves from the colony both by Lruckarr and by GEcEn- 
BAUER—as indeed the same fact had previously been observed by 
Sars in his Diphyes truncata. Hudoxia campanulata is believed by 
Leuckart to be a group of Diph. acuminata, a new species observed 
by him at Nice ; whilst he has found that Aglaisma pentagonum is 
not a monogastric diphyes, but an imperfectly developed Abyla pen- 
tagona, see Zoologisch. Untersuch. s. 54. Ersea is suspected by 
Lruckart to be a detached group of Diphyes Koch. Witt. 
Eudoxia (&c.) consists of a cover or bract, a polyp with its pre- 
hensile organs, a swimming bell (sexual capsule), and usually a 
smaller bell sprouting from the base of the polyp, which is destined 
to replace the larger when this has been detached. These parts 
are all connected by their canals to a portion of common stem. } 
Sp. Lrsea pyramidalis Wi, i. 1. fig. 27, &e. ;—Comp. Levcxart Zool. 
Untersuch. 1. 8. 43—61, GEGENBAUER Zeitsch. f. wiss. Zool. v. 285—2096. 
Orver II. Ctenophore, or Beroécea. 
Mouth simple, stomach situated in the axis of the body. Vibra- 
tile cilia disposed in rows on the surface of the body. Swimming 
bladders none. 
The Beroécious animals are Acalephs of very different form, 
which, however, are distinguished from the former order by the 
absence of swimming bladders [bells] and cartilaginous laminze, as 
