THE MICROPLANKTON OF PLYMOUTH SOUND. 173 
when it becomes common again. Streptotheca following it in much the 
same abundance, Thalassiothric common at the end of the month. 
Peridiniales practically absent. One specimen of Muggica atlantica at 
the end of the month, one Aurelia ephyra on the 24th. Sagitta very 
common. Copepods rare except Pseudocalanus, nauplius stages increz se 
and are very common at the end of the month, zoea stage of Carcinus 
manas and Cancer pagurus begins in the middle of the month. Galathea 
larva begins at the end. Young fish and fish eggs present. 
Chief forms—Brddulphia mobiliensis and regia, Coscinodiscus excentri- 
cus, Paralia sulcata, Sagitta bipunctata, Pseudocalanus elongatus, cope- 
pod nauplii, Brachyura zoe and Galathea larve in the second half of the 
month. 
February. 
S. and 8.W. winds at the beginning, N.E. at the end. Stormy weather 
mostly till the end of the month. 
Biddulphia mobiliensis and regia common, sinensis more frequent. 
Chetoceras begins again at the end of the month, C. curvisetum, con- 
volutum and teres common. Coscinodiscuvs excentricus common, radiatus 
fairly common. Paralia common, Skeletonema and Streptotheca very 
common, Thalassiothrix common at the end of the month. Practically 
no Peridiniales. Single specimens of Phialidiwm and Obelia. Rathkea 
octopunctata becomes common at the end of the month. Ephyre of 
Aurelia present on the 10th and increase at the end of the month. 
Pleurobrachia and Muggiea present. Sagitta not so.common, Terebellid, 
larvee fairly common, Cyphonautes larve fairly common on the LOth. 
Copepods common up to the 17th, then scarce, probably owing to the 
N.E. winds coming on. Calanus rare, Temora and Oithona similis very 
common on the 17th, Pseudocalanus common all the month. Para- 
pontella brevicornis at the latter end, Carcinus manas zoea very common. 
Galathea larva common, Crangon vulgaris larva fairly frequent. Corystes 
zoea begins and Levander. Copepod naupli fairly common and Balanus 
nauplii very common, beginning on the 5th. Ovkopleura dioica fairly 
common. 
Chief forms——Biddulphia mobiliensis and regia, Coscinodiscus excentricus 
and radiatus, Paralia sulcata, Skeletonema costatum, Streptotheca 
thamensis, Temora longicornis, Oithona similis, Carcinus menas zoea, 
Galathea larva, Balanus nauplius and Orkopleura dioica. 
Here we find a rush of larval Crustacea especially towards the end of 
the month. 
