10 Goal. 
CCELENTEEATA. 
short characteristic of the “zooids of both groups, derived from the 
preliminary reports. Millepora has two kinds of zooids, the one short 
and stout, occupying the larger central calicles, and provided with gastric 
cells, with a mouth, and 4-6 short knobbed tentacles ; the other, occupy- 
ing the smaller calicles, longer and more slender, without mouth, but 
with 5-20 tentacles, which are larger than in the mouthed zooids, have 
spheroidal heads composed of masses of thread-cells, and are disposed at 
irregular intervals along the body. Reproduction unknown. [Accord- 
ing to drawings by Gen. Nelson, made years ago, and now published 
(16), of M. alcicornis (Bermudas) the tentacles are placed in whorls of 
4, 2-6, above each other at regular intervals ; no mention is made here of 
zooids of two kinds. Moseley’s description, however, agrees with that of 
L. Agassiz.] In all Stylasteridce, there are likewise two kinds of “ zooids,” 
the larger and less numerous are short and cylindrical, or flask-shaped, 
have mouths and a special layer of digestive cells lining their body cavity ; 
in some genera they have 8, 12, 6, 4 clavate tentacles, forming a single 
whorl at the base of the hypostome, in others none. The more numerous 
smaller or tentacular zooids are long and tapering, have no mouth, no 
gastric cells and no tentacles ; in some genera they are dispersed irregu- 
larly among the alimentary zooids, in others {Allopora, Stylaster, Crypto- 
helid) they are arranged in a circlet around the centrally placed alimen- 
tary zooid in each so-called “ calicle ” of the corallum ; the “ pseudosepta,” 
therefore, in these genera are not true septa, but intersept imperfectly 
the tentacular zooids from each other and from the central alimentary 
polypite, which is placed on the columella, if present. Nematophores are 
disposed irregularly among the zooids, or regularly in the intervals be- 
tween the tentacular zooids at the margins of the “ calicles.” The repro- 
duction in all these deep water Hydrocorallia takes place by means of 
“ adelocodonic gonophores,” developed from the ccenosarcal network of 
the “ pseudocorallium,” in the interior of the so-termed “ ampullos'* All 
Stylasteridce are dioecious. The planulae are probably set free through 
the mouth, or through resorption of the thin external walls of the 
“ ampulla;*' The specimens (six genera and seven species) on which 
these investigations were made were mostly brought up by the trawl from 
a depth of 600 fathoms, off the mouth of the Rio de la Plata. The pos- 
sibility that Cystiphyllum and Cyathoxonia might be palaeozoic “ Hydro- 
corallia ” is suggested. 
Phanerocarpa (Steganophthalma). 
The monograph by Grenacher & Noll (9) contains an anatomical 
description of Hackel's Crambessa tagi (1869) and of Rhizostoma (^Stylo- 
nectes) luteum^ Q. G. The characters attributed to Cramhetisa by Hackel 
are shown to be partly erroneous ; Cephea (^Catostylus) mosaica is a nearly 
allied type, perhaps also Cephea octostyla^ Forsk., and Rhacopilus cruciatus, 
Less. The true characters of Crambessa piay be learned from the follow- 
ing abstract of the synopsis of the Rhizostomida: given by the author : — 
I. Rh.pervice. Arms attached to the umbrella through four isolated 
