300 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
(3 
York. There is a decided difference in size between northern and 
southern specimens, those from the Gulf of Maine being much the 
larger. This seems to be the general rule with this wide ranging spe- 
cies. And probably it is separable into distinct races, a northern and 
a southern. 
nnd Cad 
yD} p§H i 
} S 
Fas 
iy aa 
: ge 
nr, ae 
a i 
Wii ee 
S a E 
Fic. 71.— Distribution of Sagittae, July-August, 1913. 
o, Sagitta elegans; H, S. enflata; u, S. hexaptera; 1, S. lyra; s,S. serrato- 
dentata; u, Eukrohnia hamata. 
Northern limit to S. serratodentata,----, northern limit to S. enflata; 
. ., southern limit to S. elegans. 
The occurrence of Sagitta enflata, S. hexaptera, and Pterosagitta draco — 
has been noted; they were all confined to southern stations. And — 
this was also true of Sagitta bipunctata. The captures of the latter 
deserve emphasis because it is only recently that this species has bee 
