MUSEUM OF COMPARATIVE ZOOLOGY. 65 



with three pairs of spines, of which tlie terminal are small and slender, the 

 next very long, and the anterior short and stout. The lamellce of the uropods 

 are about as long as the telson : the inner is lanceolate and between four and 

 five times as long as broad ; the outer is between three and four times as long 

 as broad, with tlie tip broad, somewhat oblic^uely rounded, and projecting con- 

 siderably beyond the acute tooth in which the outer margin terminates, and 

 just inside the base of which there is a spine much longer than the tooth itself. 



The outer lamella of the appendage of the first somite of the abdomen is a 

 little longer than the protopod, about a sixth as broad as long, and margined 

 with multiarticulate plumose seta) as usual, while the inner lamella is a little 

 less than half as long as the outer, expanded externally near the base, where the 

 breadth is equal to about a fourth the length, but tajiering and slender distally, 

 and margined with plumose set£E like the outer. The inner lamella of the 

 appendage of the second somite is a little longer than the outer lamella of the 

 appendage of the first somite, between six and seven times as long as broad, 

 and bears, a little way from the base, the usual stylet, which is about a fifth as 

 long as the lamella itself. 



The single specimen is from Station 327, N. Lat. 34° 0' 30", W. Lon. 

 76° 10' 30", 178 fathoms, and gives the following measurements : — 



Sex 9 



Length from tip of rostrum to tip of telson ..... 4S.0mm. 



" of carapax including rostrum ...... 24.0 



" of rostrum .......... 15.2 



Breadth of carapax . . . . . . . . . 5.2 



Length of antennal scale . . . . . . . . .7.1 



Breadth of " " . 1.8 



Length of right chelate leg . . . . . . . .9.2 



" carpus .......... 2.2 



" chela . . . . . . . . . .1.9 



" left chelate leg 12.3 



" carpus . 4.8 



" chela .......... 1.2 



" sixth somite of abdomen .4.3 



Height of " " " ,' 2.2 



Length of telson . . . . . . . . . .6.1 



The genus Pandalus, as at present recognized, apparently contains species 

 representing several genera, and this species is probably not strictly congeneric 

 with P. Mojitagui, the type species. The carinated carapax gives the species 

 a very different aspect from the typical Pnndali, but the appendages through- 

 out, excepting the scaphognath of the second maxilla, are very nearly as in 

 P. Montarjui, and the number and arrangement of the branchite are the same 

 as in that species, P. propinquus, borealis, kptocerus, and tcnuipes, or as indicated 

 in the following formula. 



VOL. X. — NO. 1. 5 



