436 



MR. C. F. JENKIN ON 



[May 12, 



Description of the Specimens. 

 Clathrina primordialis. 



Ascetta primordiaUs H. 



Two specimens of this sponge wei^e dredged in 6 to 8 fathoms 

 at Wasin. The dimensions of the spicules agree with those given 

 by Haeckel of specimens from Avistralia. Most of the spicules 

 have rays from 160-180// longx 16-20 jj. thick. 



Clathrina darwinii. (Text-figs. 81, 82.) 

 Ascaltis darioinii H, 



Three specimens of this sponge were di-edged in 3 fathoms in 

 Ohwaka Bay, Zanzibar. The largest specimen is shown, twice 



Text-fiff. 81. 



Clathrina darwinii (H.). X 2. 



Text-fig. 82. 



Clathrina darioinii (H.), spicules. X 130. 

 ap., apical ray. 



natural size, in text-fig. 81. They were bright lemon-yellow 

 colour when alive, and are buif- white in spirits. All three 



