220 ON COPEPODA AND OTHER CRUSTACEA 



organs of the male like those of the female. Antennules of 

 the female six-jointed, with a long middle joint. Antennae 

 three-jointed. Anterior maxilliped with plumose segments. 

 Posterior maxillipeds four-jointed, margin of the hand fringed 

 with setae. Outer branches of the swimming feet armed with 

 lancet-shaped spines, the edges of which are finely denticulated. 

 Abdomen of the male five-segmented, the median segment 

 very short, genital segment voluminous, with produced lateral 

 angles. Posterior maxilliped more movably jointed than in 

 the female, its claw more strongly bent : the three short 

 terminal joints of the antennules anchylosed : other sexual 

 characters unimportant. 



The foregoing generic definition is taken — with some 

 abbreviation — from Giesbrecht's work on the Neapolitan 

 Copepoda. Some of the characters I have had no oppor- 

 tunity of verifying — the specimen here described and figured 

 being the only one known to me. 



Oncaea anglica, n. sp. (Plate VI., figs. 1-9). 



Female. — General appearance much like Corycaeus. Last 

 thoracic segment short and small (fig. 9), first abdominal 

 segment very large, more than twice as long as the combined 

 length of the four following segments (fig. 9), caudal stylets 

 nearly thrice as long as broad, quite equal in length to the 

 united fourth and fifth abdominal segments, bearing on the 

 outer margin a single rather long seta near the base, and at 

 the apex five setae of various length, the longest about equal 

 in length to the whole abdomen. Antennules six-jointed 

 (fig. i), the third and sixth joints bearing numerous long setae. 

 Antennae four-jointed (?), the last joint bearing at the proximal 

 end four strong curved setae, and at the distal end five similar 

 but larger setae (fig. 2). Anterior maxilliped (fig. 3) divided 

 apically into two digitiform processes which bear numerous 

 marginal setae : posterior maxilliped ending in a powerfully 

 clawed hand (fig. 4), the inner margin of which is armed with 

 two spine-like sets; the claw nearly as long as the hand itself, 



