THE MICROPLANKTON OF PLYMOUTH SOUND. 167 
TSOPODA. 
** Nordisches Plankton,” Vol. 14. 
(1) Idotea viridis (Slabber). Ra1e in November and March. 
(2) Gnathia mazillaris (Mont.). Young larva, free, rare, December. 
Praniza larva once in the middle of May. 
(3) Microniscus sp. On Copepeds, chiefly Calanus, Acartia and Pseudo- 
calanus, from September to December, rare in March, most frequent 
in September. 
(4) Bopyrina sp. Rare, January and February. 
CUMACEA. 
Sars, G. O., “‘ Crustacea of Norway, Cumacea.”’ 
(1) Pseudocuma cercaria (P. G. van Ben). Very rare, September and 
February. 
SCHIZOPODA. 
‘* Nordisches Plankton.”’ Vol. 12. 
(1) Nyctiphanes Couchi T. Bell. Not common, in the beginning of May 
only, immature. 
(2) Macropsis Slabberia Van Ben. Rare, December only. 
Siriella Clausii G. O. Sars. Once only in October. 
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5 
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ee 
(4) Leptomysis mediterranea G. O. Sars. Not common, November to 
January. 
Kuphausicde larve. Not common, October, November, 
March to May and August. 
STOMATOPODA. 
Squilla Desmaresti Risso, larva. Once only in October, 1915. 
MacrurRa. 
These are all larval forms; starting with Carcinus me@nas early in 
January they gradually increase and are very common through the 
spring and early summer, and although plentiful through August and 
September, fall off considerably in October, being only represented by 
stray stragglers through the winter. 
(1) Leander sp. larva. On and off from May to November. Single 
specimens at the end of February. Commonest in Julv. 
