1898-1902. No. 18.] CRUSTACEA. 17 



and produced below to a conical recurved projection. Anterior antennae 

 of exactly the same structure as in female. Last pair of legs, however, 

 very different and greatly developed, being built on the type character- 

 istic of the genus; right leg more slender than left, and consisting of 

 4 joints, the penultimate one long and slender, sublinear in form, and 

 produced at the end outside to a conical projection, terminal joint 

 divided into 3 unequal lappets, the middle one the largest and some- 

 what spoon-shaped; left. leg angularly bent in front of the middle, and 

 distinctly 5-articulate, penultimate joint large and tumid, oval in form, 

 and provided at the base inside with a slender spiniform appendage, 

 outside which another much smaller projection occurs, lower face pro- 

 vided, in front of the middle, with a rounded projecting tubercle, ter- 

 minal joint somewhat club-shaped, and provided at the end outside with 

 about 6 lanceolate, leaf-like appendages, tip rounded off and fringed 

 with a comb-like series of delicate, somewhat compressed spinules. 



Length of adult female 1.20 mm., of male 1.05 mm. 



Remarks. In its external appearance this form somewhat 

 resembles 5". Scotti, G. 0. SARS, but is of larger size and more slender 

 shape. It also differs conspicuously both from this and the other known 

 species in the structure of the last pair of legs in both sexes. 



Occurrence. One female and 2 male specimens of this form 

 were found in a bottle containing specimens taken on July 12, 1900, in 

 the bay at Land's End. 



Fam. Centropagidse. 



70. Centropages hamatus (LILLJEB.). 



Found rather abundantly in a plankton-sample taken on June 29 r 

 1898, in lat. 57 31' N., long. 1 29' E. 



Fam. Temoridae. 



71. Temora, longicornis (MuLL.). 



Found in the same sample in which the preceding species occurred. 



Fam. Pontellidse. 



72. Anoma.locera, Patersoni (TEMPLT.). 



Several specimens of this characteristic Atlantic form occurred in 

 the same sample as the 2 preceding species. 



