4 PREFACE. 



part original, but in the main they are culled from 

 the works of DeKay, Gould, Morse, A. Agassiz, 

 Tryon, Smith, Verrill, and Emerton, to whom, 

 consequently, I am placed under obligation. To 

 the last-named gentleman, author of a handy little 

 volume designed for the New England coast, " Life 

 on the Sea-Shore," do I particularly wish to ex- 

 press my acknowledgment. The student who de- 

 sires to enter somewhat more fully into the study 

 of our sea-shore fauna than is possible from the 

 following pages will do well to consult Dr. Leidy's 

 paper, " Contributions towards a Knowledge of 

 the Marine Invertebrate Fauna of the Coasts of 

 Rhode Island and New Jersey" (published in the 

 Journal of the Academy of Natural Sciences of Phila- 

 delphia, vol. iii.), and Prof. Verrill's report on the 

 " Invertebrate Animals of Vineyard Sound," pre- 

 pared for the United States Commission of Fish 

 and Fisheries (1873). 



ANGELO HEILPRIN. 



Academy of Natural Sciences op Philadelphia, 

 June 18, 1888. 



