86 GENERAL DIRECTIONS. 



the southern faunas by a line of demarcation of the most 

 rigid character. The coast of Maine and Massachusetts 

 bay is bathed by a cold Arctic ocean current which is re- 

 placed south of Cape Cod by warmer water. Although 

 several genera straggle from one zone into the other, 

 the majority are limited to their homes by this powerful 

 climatic influence. Hence it is that one may expect to 

 find a great difference in the marine life of Narragansett 

 Bay and that of the Bay of Fundy, and while I have at- 

 tempted to consider both in this article even the best of 

 collecting places will not yield more than a small propor- 

 tion of the genera considered. That part of my work 

 which deals with floating life and with larval forms is nec- 

 essarily very incomplete. 



LIST OF C03LENTERATA AND ECHINODERMATA FOUND IN 

 NEW ENGLAND. 



In the accompanying list I have mentioned the majority of the genera 

 and species of Ccelenterates and Echinoderms which occur in New 

 England waters. It is believed that this list includes the more com- 

 mon species of these animals which the teacher is liable to coilect on 

 his excursions. The identification of the majority of the animals of 

 the list will, it is hoped, be facilitated by a knowledge of the generic 

 and specific differentiation indicated by the diagnosis which is given of 

 the more common types. 



HYDROZOA. 

 Hydroidea. 

 Acaulis primarius Stimpson. Antennularia Kirsch. 



Aglaophenia arborea (Desor) Blastothela rosea Verrill. 



Verrill. Bougainvillea superciliaris Ag. 



Note.— The figures of Modeeria ( Tarritopsis), Zandea and Cunina. in the preced- 

 ing pages were originally published in works by the author from drawings loaned 

 him by Dr. A. Agassiz; that of Acaulis from drawings by Prof. A.Hyatt. To 

 these naturalists and to all others to whom the writer is indebted, in the prepa- 

 ration of ihis Aid, the writer takes t'ds cccasion to express his appreciations of 

 his obligation, and his sincere thanks. 



