ON THE OCCURRENCE OF APHROCERAS (LEUCANDRA) CLIARENSIS. 259 



of the Calcareous Sponges, etc." {Proc. Zool. Soc. Lond., Sept., 1913) 

 Mr. Kow and I have placed the species in the genus Aphroceras Gray, 

 which is distinguished from Leucandra by the presence of a dermal 

 layer of gigantic longitudinal oxea. This genus cannot, however, be 

 very sharply separated from Leucandra, and in A. cliarensis a great many 

 of the large oxea lie obliquely in the deeper parts of the sponge, as in 

 many Leucandras. Nevertheless, there are sufficient of the large oxea 

 in the dermal layer to give the surface of the sponge the longitudinally 

 striated (and not obviously hispid) character of Aphroceras. 



The discovery of this interesting species at Plymouth contributes an 

 interesting addition to the marine fauna, not only of the district, but 

 also of Great Britain ; while the fact that it should have turned up there 

 so shortly before the appearance of Miss Stephens' memoir is one of 

 those curious coincidences which so frequently surprise the systematic 

 zoologist. 



JTEW SERIES. — VOL. X. NO. 2. JUNE, 1914. 



