274 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
larvae of the red fish (Sebastes marinus). And the assemblage over — 
the western basin was the same, with the addition of the schizopod, 
Meganyctiphanes norvegica. Off Penobscot Bay (Stations 10091 and 
Zs # a 
Ps 7 
10100) there were swarms of Limacina balea, a pteropod represented 
at most of the other Gulf Stations by small numbers only; at several 
stations the nets brought back numerous specimens of Staurophora 
(p. 273), and at Stations 10091 and 10092 the surface waters were 
swarming with young amphipods (Euthemisto), as well as with young 
stages of Calanus finmarchicus, in the proportion of about one of the 
former to four of the latter. The accompanying table showing the 
occurrence of fifteen of the more characteristic and faunistically 
important species, illustrates the extreme uniformity of the plankton 
of the Gulf. At fourteen of the nineteen stations in the Gulf ten or 
more of these fifteen species are represented; and at only three stations 
were less than eight found; the poorest even (Stations 10098, 10099, 
10105) had half of the species. Two forms, Calanus finmarchicus, and 
Sagitta elegans were taken at every station; and a third, Pseudocalanus 
elongatus was probably also universal (p. 291). Euthemisto compressa, 
Anomalocera pattersoni, Limacina balea and Phialidium languidum 
occurred at 80-90% of the stations and Euchaeta norvegica at every 
station where the haul was deeper than forty fathoms. And no sub- 
division of the Gulf into faunal regions is possible for any of the spe- 
cies, except that in a general way neritic forms, e. g., Tomopteris 
helgolandica, Staurophora, and Phialidium, and the various metazoan 
larvae which are always more or less in evidence in the tows near 
shore, occurred less regularly at the stations in the centre of the Gulf. 
The only region which showed a decided variation from the general 
plankton type just described was German Bank (Station 10095) where 
the copepods were largely replaced by a swarm of Plewrobrachia pileus. 
But this was an impoverishment, rather than a different plankton 
type, for Pleurobrachia is widely though irregularly distributed over 
the Gulf in summer; and when it swarms, seems to obliterate or devour 
almost everything else in the water. 
In 1913, as in 1912, we found a few pelagic organisms of unmis- 
takably oceanic and warm water origin in the Gulf, e. g., Salpa, two 
copepods, Euchirella rostrata, and Pleuromamma robusta, and a chae- 
tognath, Sagitta serratodentata; but the Gulf Stream component was 
smaller than in the previous year; while on the other hand, three cold 
water species, which, though not truly. polar, are at least at home in low 
temperatures, 7. €., Calanus hyperboreus, Euchaeta norvegica and 
Eukrohnia hamata, were more abundant than in 1912, and a fourth, 
