New York State Museum. 27 



Colurabella lunata, Say. 



Found clinging to a tubularian ^Parypha crocea, Ag.) growing in 

 a hollow in the top of a short pile on the ocean front, between 

 tides. 

 Crepidula unguiforrais, Lam. 



Adhering to dead shells rolling on the beach, between tides. 

 Crepidula fornicata, Linn. 



From surface of dead shells, and living crabs on the ocean-front; 

 and from the surface of king-crabs on the shore of Delaware 

 Bay. 

 Pholas truncata, Say. 



Very young specimens, measuring less than a centimeter in length. 

 Associated with the next species. 

 Petricola pholadiformis, Lam. 



Found burrowing in mud-beds on the ocean front, exposed between 



tides. 

 Also pieces of hard clay with holes bored by Pholas and Petri- 

 cola. 

 Modiola plicatula, Lam. 



Found imbedded in mud on a marsh at the side of a small inlet 

 which becomes diy as the tide recedes. 

 Mytilus edulis. Linn. Edible mussel. 



Found attached to mudbeds and piles on the ocean front, exposed 

 between tides. 

 Mytilus edulis, var. pellucidus, Penn. 



Associated with the preceding but not so plentiful. 

 Masses of broken shells, pebbles and clay, bound together with 

 byssal threads of Mytilus edulis. 

 Hydractinia echinata. 



Coating shells inhabited by Eupagurus longicarpus. 

 Parypha crocea, Ag. (A Tubularian.) 



From a h llow in the top of a short pile, on the ocean-front, 

 exposed between tides. 



GEOLOGY. 



By Donation. 

 G. E. Van Guysling, Albany, N. Y. 

 Coquina, Fort Marion, St. Augustine, Fla. 

 Coquina, City Gates, St. Augustine, Fla. 



Z. W. Vanderolf. 

 Granite, Quarry of M. Mallen, Mount Adam, Orange Co. N. Y , 



