PLANKTON OF THE GULF OF MAINE 



23 



mon copepods, notably to Calanus finmarchicus, Pseudocalanus elongatus, Metridia 

 lucens, Euchfeta, and to sundry others (see the chapter on copepods, p. 167); like- 

 wise to Sagitta elegans (p. 308), both the local species of Euthemisto (E. compressa 



Fig. 22. — Distribution of the more characteristic types of animal plankton in the odshore waters of the Gulf of Maine, 

 July and August, 1914. O, calanoid copepods dominant; #, glass worms (Sagittfe) dominant; X, amphipods (Euthe- 

 misto) dominant; A, euphausiid shrimps dominant; A, cteuophores (Pleurobrachia) dominant; Q, hydromedusse 

 (Phialidium) dominant; P, swarm of pteropods {Limacina retrovasa) 



and E. bispinosa, p. 156), the euphausiid shrimps Meganyctiphanes and probably 

 Thysancessa inermis (p. 139), and the pteropod Limacina retroversa (p. 124), to men- 

 tion only a few. It also applies to a whole category of animals of coastwise nativity 



