270 Mr. H. J. Carter on some West-Indian 



into the interior, which thns forms a " cloaca." I use the 

 words " of course " advisedly, because the vents in all cases 

 must open in these ways respectively. 



Family 2. Aplysinida. 



Aj)l7/sina aeroj}hoba, Nardo. 



Several specimens (see Schmidt, in Spong, Adriatisch. 

 Meeres, p. 25, and type specimens in the British Museum). 

 Loc. Antigua. 



AjjJf/sina compressa, n. sp. 



(Fragment.) Compressed, curved, flat, flabelliform, thinning 

 out towards the upper or unbroken margin. Firm in the 

 dried state, black and shining, like "satin." Surface wrinkled 

 by irregular polygonal divisions, in which the ridges are 

 much more elevated on one (?the outer) side than on the other 

 (? the inner) one, where the vents are. Fibre concealed by 

 the black sarcode, except at the broken edges and waterworn 

 parts, where it presents an opaque yellow colour, contrasting 

 strongly with the rest of the sponge. Size of the fragment 

 4 X 2 X ^ inch in its greatest dimensions. 



Hah. Marine. 



Loc. Long Key Island, Nassau. 



Ohs. This looks like a fragment ^f a once flabelliform or 

 vase-like structure. As I have before stated, the chief ditfe- 

 rence between this kind of Apli/sina and Lvjfaria is more or 

 less empirical, being one of degree in which the core of the 

 fibre of the former exceeds in thickness the wall of the trans- 

 parent kerasine cylinder which surrounds it, while in the 

 latter it is the opposite. Generally too, perhaps, the growth 

 of this kind of Aphjshia is more massive, sessile, and s])read- 

 ing, while that of Lvffaria is more cauliform and ascendant. 

 In the two species, viz. A. carnosa and A. corneosfel/ata, 

 however, and in the mixed form, A. capensis (' Annals/ 1881, 

 vol. viii. p. 110), the surface is covered with minute hair-like 

 filaments, which are the terminations of the internal fibrous 

 structure. There is a quadrilateral compressed specimen of 

 this kind (apparently a fragment too) in the British Museum 

 (no. 177, "5 c"), where the vents, which are large and on 

 the margin, represent a Pandean-pipe arrangement. 



Ajjlijsina cauJiformisj n. sp. 



Cauliform, cylindrical, round, solid, long ,• simple or 

 branched irregularly 5 erect, straggling, or repent, rising 



