318 WEST AFRICAN M0LLU8KS STEARNS. 



At the latter place the naturalists did not land, owing to qnarantine 

 restrictions. The expedition arrived home at New York on the 23d 

 of May, 1890. 



As far as Cape Town the collections were made conjointly by the 

 acting- and assistant naturalists; at Cape Town Mr. Arthur H. Brown 

 was detached from the expedition to go into the interior. 



Class PELECYPODA. 



Order PRIONODESMACEA. 



Suborder OSTRACEA. 



Genus OSTREA ].inn6. 

 1. Ostrea niordax Gould. 



One specimen. Ascension Island (Mus. No. 125410). 

 A single characteristic example. 



2. Ostrea frons Linn^. 



Odd valves, beach. Porto (Grande (Mus. No. 125318). 

 Also occurs at various ])laees in east and west Florida, Florida 

 Keys, West Indies, and Barbados, 



Suborder PECTINACEA. 



Family SPONDYLID^. 



Genus SPONDYLUS I.inn^. 



3. Spondylus gaederopus Lian^. 



Three valves, beach. Porto Crande (Mus. No. 125583). 

 4. Spondylus imbutus Reeve. 



One example, dredged. Ascension Island (Mus. No. 125411) 

 A small, fresh specimen of the above was obtained from a depth of 

 40 fathoms. 



Family PECTINID.E. 



Genus PECTEN Miiller. 

 5. Pecten miniaceus Reeve. 



Three crdd valves. Fayal (Mus. No. 125284). 

 A very iiretty species. 



Suborder MYTILACEA. 



Family AVICIJLID^. 



Genus PERNA Brufjuiere. 



6. Perna perna Linnd. 

 f = P. deniiferuf), var. Krauss. 



