226 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



Diatoms. The collections gave three species, Coscino- 

 discus, Biddidphia and Chcetoceros. The latter was only 

 found in October. The two former species were extremely 

 abundant on the first visit, but less numerous on the 

 second, and Coscinodiscus was then the prevailing form. 

 Protozoa. Ceratium trijios, C. fusus and C. furca were 

 represented by a small number of specimens in October. 

 Ccelenterata. Many small Pleurobrachia were taken 

 during the two visits. 



Yermes were represented by Sagitta, Tomopteris and 

 Autolytus. The former was plentiful in October, but less 

 numerous in November. The other two were present 

 during both visits, one or two being taken in every tow- 

 netting. 



Gopepoda. The Copepoda noted, were Calanus, Pseudo- 

 calanus, Paracalanns, Temora, Acavtia, Oithona, Labido- 

 cera, Anomalocera, and MonstriUa. Pseudocalanus, Para- 

 calanus and MonstriUa were found in November, Labido- 

 cera and Anomalocera in October. The whole of the collec- 

 tions contained a large number of Copepoda, but with the 

 exception of Acavtia the species given above were only 

 represented by one or two specimens. The Copepoda 

 practically consisted of Acartia discandata. A few A. 

 clausia were present amongst them. One female and 

 several males of a MonstriUa taken in November appear 

 to be distinct from any of the described species. The 

 female resembles M. gracilicauda in general features, but 

 differs in the structure of the fifth feet. These are long 

 and narrow and have only two setae on each branch. The 

 branches are ciliated along the inner margin near the 

 apical end. The males are easily recognised by the serrate 

 appearance on the upper margin of the last joint of the 

 antennules. The species will be described more fully in 

 a later report should it turn out to be a new species. 



