28 Mr. Lubbock on 



The abdomen is four-jointed in the male, and two-jointed in 

 the female, and in both the candal stylets are very long, fringed 

 on the inner margin with delicate hairs, besides the five long ones, 

 which are themselves plumose. 



Length of cephalothorax (not including the spines) . ."04. 

 „ abdomen (including the stylets) "02. 



Collected by Dr. Sutherland in 37° N. L. and 11° 30' W. L., 

 and in 27° 30' N. L. and 20° W. L. 



There were only four or five specimens, and one of the females 

 bad a spermatic tube attached to the abdomen. 



PI. IL figs. 1 to 7. 



D'laptomus ahdominalis, n. sp. 



Frons subtriangulatus. Cephalothorax postice obtusus, 5-arti- 

 culatus, articulis posticis suba?quis. Antennre anticac corpore 

 paulo breviores, setis apicali postica, penultimaque antica, 

 longis, aliis brevibus. Maxillipedes longae ut in Calano. 

 Abdomen foeminse 3-articulatum, maris 4?-articulatum. Styli 

 caudales breves divaricataj, 



The second pair of maxillae are formed as in Calanus, and are 

 much shorter than the maxillipeds, being "013. 



The maxillipeds are '038 in length, and seven-jointed, the ter- 

 minal segment being very minute. The basal segment is not 

 much larger than the second. 



Tiie natatory legs of the female have both the rami three-jointed. 

 In the first pair the spines are not conspicuous ; the first segment 

 of the inner (lesser) branch has one hair, the second two, the third 

 two at the side and two terminal. The two first segments of the 

 outer branch have each one hair ; the terminal segment has three 

 hairs at the side, and two at the apex, besides the small ones on 

 the outer marijin. Len<Tth "045. 



In the fifth pair the hairs on the outer margin are more conspi- 

 cuous. The terminal segment of the inner brancli has three hairs 

 on the margin, while on that of the outer branch there are five 

 marginal hairs, and at the apex a short broad spine. Length '04. 



The arrangement of the hairs in the male is similar, but the 

 margins of the segments are more or less bulged out. 



The fifth pair of legs of the male are small and unsymmetrical, 

 about '022 in length. Those of the female are symmetrical, but 

 not formed like the others, having no trace of an inner branch ; 

 they are '01 in length. 



The abdomen is large. In the female it is three-jointed, the basal 

 segment being the largest, and the caudal stylets large and rather 



