PLANKTON OF THE WOODS HOLE REGION 155 
been extremely abundant. It is difficult to see how such large numbers could have 
remained together in the long journey from the West Indies (where they never 
form a very considerable part of the plankton) to our coast and then not be scattered 
by the strong winds, which were necessary to blow them in. It is more probable 
that they are the young of an unknown species of the genus Odontodactylus inhabit- 
ing the deeper waters off the New England coast, possibly beyond the range of 
e e o e e e e 
er VE uEe Wis awe oie takes 
a az) =) << m (o) a A 
Vohe 
Ae 
Se 
VeS 
Fic. 55.—Occurrence of larval Macrura in surface collections of 1922. 
, Pagurus; ee eee, Crago 
Septemspinosus; ——« —=_ Palzmonetes vulgaris; —-coe—, Naushonia crangonoides; ——e—= Hippolyte 
zostericola; eeeeeee, Callianassa stimpsont 
Lysiosquilla armata. Two unidentified species of Erichthus larve were taken by 
Verrill off Marthas Vineyard in August. One he suggests to be the larva of Pseudo- 
squilla ciliata Miers. Both species were no doubt southern forms. 
r MACRURA 
The Macrura form a very important part of the summer plankton. None of 
the members of this group are pelagic in adult life except some of the Caridea during 
the breeding season, but in all the larve are planktonic. 
