Mollitscan Fauna of St. Helena. 131 



TelUmya similUma. (PI. XII. fig. 1.) 



Testa T. hidentake similis, sed umbonibus leviter prominentioribus, 

 magis ccntralibus, dentibus duobus valvae sinistroe brevioribus et 

 fortioribus. 



Longit. 3| millim., alt. 2|. 



This small species is very thin and fragile, pellucid, and 

 agrees in general aspect with 2\ hidentata of Montagu. It 

 is not, however, quite of the same form, having the beaks a 

 little less anterior in position and a trifle more prominent. 

 The two teeth in the left valve are also less divergent^ 

 shorter, and stronger. 



Montacuta ferruginosa ( ]\Iontagu) . 



Hah. North Sea, Atlantic to the Mediterranean. 



The two valves from St. Helena evidently belong to this 

 species, which has not, I believe, been previously recorded 

 from so southern a locality. 



Pecten pes-felis^ var. 



Two small valves of this species are rather flatter than 

 usual. They certainly belong, however, to this well-known 

 Mediterranean species. 



II. Species found on Floating Tangle and to be 



EEGARDED AS SOUTH AFRICAN. 



Rissoa fenestrata, Krauss. 



Hah. Mouth of the Knysna {Krauss) ; Port Elizabeth 

 [Sower h^/). 



Trochus {Gihhula) cicer^ Menke, 



Hah. Cape of Good Hope [Philippi) ; Simon's Bay 

 {Gould); Table Bay {Krauss) ; Port Elizabeth {Sowerhy). 



Phasianella hicarinata, Dunker. 



Hah. Cape of Good Hope {Dkr.). 



The bicarination of this pretty little species is accurately 

 described by Dunker as obsolete. Therefore, judging from 

 specimens in the Museum which I identify with this s])ecies, 

 1 am inclined to suppose that this angulation is exaggerated 

 in the figure given by Prlsbry in Tryon's ' Manual of 

 Conchology,' vol. x. pi. xxxix. a. flg. 10. 



