308 L. E. CRAWSHAY. 



At Position 1, one. Greatest measurement 20 mm. 



of small Gastropod. 



Depth, 40-49 fath. 



In all of three specimens closely examined, namely those from 

 Positions 7, 43, and 60, the centrotylote microsclera are abundant but 

 extremely variable in size and form. 



Much confusion has arisen about the identity of this species, which 

 has frequently been referred to as Sulerites dormmcula, a species 

 which apparently does not occur in the British fauna. For a dis- 

 cussion of the species with full synonymy, see Topsent's valuable 

 account (41, p. 203). The extremely large growth often attained by 

 the species on the inner grounds inside the breakwater seems never to 

 occur in the deeper water, the difference being apparently due to food- 

 supply. 



Suberites carnosus (Johnston). 



At Position 9. One small detached specimen. Greatest measure- 

 ment 5 mm. 

 „ 32 or 33 (?). One small specimen of ovoid form grow- 

 ing on the basal portion of Polymastia agglutinans. 

 Greatest measurement 10 mm. 

 Depth, 42 fath. 



Rhizaxinella elongata (R. and D.), Topsent. 



A single specimen, evidently belonging to this species, was obtained 

 at Position 38, in 44 fathoms. Some uncertainty was felt as to its 

 identity owing to the presence of an important internal character to 

 which no allusion has been made in records of the species. This is the 

 possession of a series of longitudinal belts of spicules in the form of a 

 broken hollow cylinder surrounding and distinct from the axial core. 

 It is difficult to understand that no mention should be made of a char- 



