PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 437 



Hippolyte securifrons Norman. 



Stations 897 and 880 ; 225 and 252 fathoms ; three large females. 



The branchial formula of this species, written essentially after Hux- 

 ley's method, is : 



Bythocaris sp. 



Stations 8G5 to 867, 872, 874, 878; G4 to 142 fathoms. 



Pandalus propinquus G. O. Sara, ChrivStiania Vitlenskabs-Selskabs Forhandlinger, 

 18o9, p. 148 (4); ibid., 1871, p. 259 (IG). 



Stations 878, 879, 880, 893, 894, 875 ; 142 to 365 fathoms. The largest 

 specimen is a female, over 110""" in length. 



This species was dredged in 1879 in the Gulf of Maine, off Cape Cod, 

 station 305, K. lat. 42° 9' 30", W. long. 69© 41', 118 fiithoms, soft mud ; 

 and station 343, K lat. 42° 17'^ W. long. 69° 51', 116 fathoms, mud. A 

 male, 74""" long, from station 305, has the chelate second pair of legs 

 reversed, the short one being on the left and the long one on the right ! 

 The legs themselves are of the normal size and structure, and the speci- 

 men api)ears to be perfectly notmal in all other respects. 



As far as I am aware, the species has heretofore been recorded only 

 from deep water off the coast of Norway. 



Pandalus leptocerus, sp. nov. 



In size and general appearance much like P. Montagui {annuJicornis), 

 but more slender and readily distinguished from it, and from P. irropin- 

 qiius and horealls as well, by the minutely roughened surface and the 

 presence of exopods upon the external maxillipeds. 



The rostrum is from about once and a third to nearly twice as long a.s 

 the rest of the carapax, and curved very slightly upward, but usually 

 not as much so as in P. Montagui. Above, it is armed with eleven to 

 thirteen teeth, of which one is near the tip, as in P. Montagui^ and 

 usually only two back of the orbit on the carapax proper, while a con- 

 siderable space back of the terminal spine is unarmed, thougli this space 

 is usually shorter than in P. Montagui. Beneath, there are 6 to 8 teeth, 

 as in P. Montagui. The entire surface of the carapax and abdomen is 

 slightly roughened with short and irregular, transverse, punctate ridges, 

 which give rise to very short, bristle-like hairs, while in P. Montagui, 

 propinquus and horcalis the surface is naked and very smooth. The 



