96 TBANSACTIONS LIVEBPOOL BIOLOGICAL SOCIETY. 



Mr. Andrew Scott, " Fisheries " Assistant at University 

 College, has worked through a large amount of material 

 collected at low water and on various marine expeditions, 

 with excellent results, the majority of those here mentioned 

 having been found by him. To his kindness and skill in 

 delineation I am also indebted for the drawings from 

 which the plates accompanying this paper are engraved. 



Description of Species. 



COPEPODA. 

 Family Pseudocyclopiim;. 



Pseudocyclopia stephoides, n. sp. (Pis. VI and VII, 

 figs. 1 to 14). 



Length, exclusive of caudal setae, 12 mm. Cephalo- 

 thorax robust, four-jointed, the first segment being two- 

 thirds the combined length of the other three. Abdomen 

 five-jointed in the male (fig. 14), four-jointed in the female 

 (fig. 13) ; the lower portion of the first joint in the male 

 abdomen (fig. 14) is covered with fine very short hairs or 

 spines ; the first joint in the female abdomen is about 

 equal in length to that of the combined succeeding three - 

 joints. Bostrum short. 



Anterior antennae (fig. 2) of moderate length, twenty 

 jointed. Basal joint large, almost equal in length to the 

 succeeding six joints, and bearing three plumose setae and 

 one shorter seta; the seventh, ninth, thirteenth, and 

 twentieth joints have long sensory filaments ; the nine- 

 teenth joint has one plumose seta ; each joint bears one 

 or more ordinary setae. The proportional lengths of the 

 joints are about as follows : — 



24 5334563433333333 334 

 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 



Primary branch of posterior antennae (fig. 3) two-jointed, 

 in this respect and no other differing from the generic 



