452 Mr. H. J. Carter on the 



6. A smaller kind, in wliich the rays are straight, smooth, 

 and capitate (PI. XIII. fig. 19). This, which has also been 

 figured by Mr. Kent (Month. Microscop. Joum. 1870, no. 33, 

 pi. Ixv. fig. 20), is analogous to no. 6 in A, Bocaget, and thus 

 becomes a transitionary form of the rosette in the latter to the 

 large, spined shaft no. 5 (just described) peculiar to^. beairix, 

 in which sponge there is no rosette ; that is, the globular 

 rosette in A. Bocagei first presents itself in that sponge with 

 elongated shaft-like axis and pointed or capitate spines, which 

 form is again found, toithout the globular rosette, mA. heatrix 

 apparently leading to the large spined shaft that is as charac- 

 teristic of this species as the globular rosette is of 4. Bocagei. 



Ohs. About the bunch of dead Lophohelia prolifera dredged 

 up by Mr. Kent there are, as before stated, in addition to the 

 larger specimens of Ajyhrocallistes Bucagei and Aulodictyon 

 Woodwardn, several embryo sponges ; and two of these (viz. 

 one -2^ and the other about -j\ of an inch in diameter) I 

 mounted in Canada balsam, when it was observed that they 

 both belonged to AphrocalUstes Bocagei] but while the vitrified 

 fibre had not begun to appear in the former, it had in tlie 

 latter, where several sexradiate and linear spicules had become 

 cemented together, involving also some of the sexradiates of 

 Ajyhrocallistes Bocagei with feather-like spined arm (PI. XY. 

 figs.9 &11 ,a,b,c). At first I took these embryos foxAskonema ; 

 but the sexradiate spicule with feather-like spined arm, together 

 with the vitrification (both of which are absent in Askonema)^ 

 decided this point. Then I remembered that the feather- 

 like spined arm-spicule abounded also in Symimgella nux ; but 

 the ladder-like forms of the vitreous fibre here, together with 

 the presence of the pappiform rosette with flexed rays, presented 

 a decided difference. Lastly, it was observed that their spicules 

 accorded with those of LanugineUa pupa, Schmidt. But when 

 it is remembered that Schmidt's specimen of Aphrocallistes 

 Bocagei bore on its surface many specimens of his LanugineUa 

 in an embryo state, that their spicules are identical with those 

 of the embryos of Ajyhrocallistes Bocagei on the specimen of 

 Lophohelia mentioned, in company also with a fully developed 

 living specimen of A. Bocagei, there seems to be very good 

 reason for assuming that LanugineUa pupa is neither more nor 

 less than A. Bocagei in an embryonic condition. 



Aulodictyon Woodwardii, Kent. 



In the tube net of Aulodictyon, like that of Aphrocallistes, 



there are several other spicules besides the staple sexradiate 



which forms the basis of the vitreous fibre ; and these are also 



more or less enclosed together with the sexradiates. According 



