PROCEEDINGS OF THE NATIONAL MUSEUM. 



ACMAEA PELTA Eachscholtz. 



Not overbundant. 



ACMAEA PERSONA Eschsholtz. 



Common. 



ACMAEA MITRA Eschscholtz. 



Common dead, living specimens not rare. 



ACMAEA INSESSA Hinds. 



A few fro m seaweeds. 



ACMAEA INSTABILIS Gould. 



Dead on beach, but no living specimens found. 



ACMAEA PALEACEA Gould. 



One specimen from corallines. 



CALLIOSTOMA CANALICULATUM Marlyn. 



Dead juveniles. 



CALLIOSTOMA COSTATUM Martyn. 



Fairly common. 



MARGARITES PUPILLA Gould. 



Common under stones and among corallines. 



MARGARITES LIRULATA Carpenter. 



Common. 



TEOULA FUNEBRALIS A. Adams. 



Not rare but not nearly as common as further to the south. 



HALIOTIS RUFESCENS, (probably subspecies WALLALENSIS Stearns.) 



Not found at Trinidad, but said to be common at Patrick Point 

 some miles to the north, where the lava rock gives way to 

 granite. 



FISSURroEA ASPERA Eschscholtz. 



Quite common under shelving rocks ; large specimens much more 

 frequently found here than further south. 



TONICELLA LINEATA Wood. 



Young specimens not rare but no large ones found. 

 POLYPLACOPHORA. 



ISCHNOCHITON MERTENSI Middendorff. 



A few about the base of eel-grass. 



ISCHNOCHITON COOPERI Carpenter. 



Frequent. 



ISCHNOCHITON, species. 



Too young to determine (/. marmoratus. Dall ?) . 



ISCHNOCHITON. species. 



Too young to determine. 



MOPALIA LIGNOSA Gould. 



On the under side of rocks embedded in sand. 



MOPALIA CILIATA Sowerby. 



Not very common. 



