Botany and Zoology. 443 
depth beyond the reach of the dredge and are only exposed by the erod- 
ing action of the breakers during heavy storms. In following these 
aches we observed a decided increase of the tropical character in the 
d th 
explorations I have given below a catalogue of the Mollusca and higher 
i ich seems to be the 
most concise and satisfactory method. A few prefatory remarks of a 
Geologists will be interested 
th 
which would doubtless have been found alive upon further search. 
occurrence of Myalina subovata is interesting, although our specimens of 
agascarensis, Of this we obtained several fine specimens on the 
beaches, none living however. he ee 
In the following catalogues all species of which the identifications is at 
all doubtful are indicated by the mark of interrogation. 
Mollusca. : 
en Vittata, Pinna squamosissima. Mercenaria violacea. 
Sula 8p. “ — carolinensis. “s Mortoni. 
Ascidia sp. Avicula atlantica. _* — notata, 
__ Tingula pyramidata, Modiolaria lateralis. Trigona sp. 
— Anomia ephippium, Modiola plicatula. Venus rugosa ? 
| Ostrea virginiana, “ “americana. Chione cancellata, 
“ _ equestris « — tulipa? « — pygmiea 
Plicatula depressa, Mytilus edulis, Callista gigantea, 
Soa SP « ~ eubitus. « maculata, 
_ scabra ? Chama arcinella. pacer’ discus, 
: hylla. cinopsis sp. 
Pasion distoeatus Cardium magnum. egy ee 
“ concentricus. i dia. Petricola pholadiformis. 
‘ “ nodosus. «  muricatum. Raéta canaliculata, 
ina charlestonensis,  Liocardium serratum. = 
iy * Mortoni Mactra oblonga. 
Atea Holmesii, : Lucina crenulata. * ilis. 
ameri « — eribraria? « — lateralis. 
“ celata, « — edentula, Donax variabilis. 
hi rigil Cumingia tellin 
sit a Felania s Semele orbiculata. 
we i m reticulata? 
~@ Ponderosa, Dipiooone) Biome nee 
Nucula pidum. : 
ro: 
Yoldia oor age ees ee ta? Tellina alternata. 
a Cardita ‘tridentata. faus 
