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. ii.), 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 OF PHILADELPHIA, 
June 18, 1888. 
