PLANKTON OF THE GULF OF MAINE 
23 
mon copepods, notably to Calanus finmarchicus , Pseudocalanus elongatus, Metridia 
lucens, Euchseta, 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. com/pressa 
Fig. 22 .— Distribution of the more characteristic types of animal plankton in the offshore waters of the Gulf of Maine, 
July and August, 1914. O. calanoid copepods dominant; Q, glass worms (Sagittae) dominant; X, amphipods (Euthe- 
misto) dominant; A, euphausiid shrimps dominant; A, ctenophores (Pleurobrachia) dominant; ©, hydromedusse 
(Phialidium) dominant; P, swarm of pteropods ( Limacina retroversa ) 
and E. bispinosa, p. 156), the euphausiid shrimps Meganyctiphanes and probably 
Thysanoessa 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 
