MUSEUM OF COMPARATIVE ZOOLOGY. 63 



Breadth of antennal scale 1.3 mm. 



Length of right chelate leg 11.5 



" carpus 4.2 



" chela 1.0 



" left chelate leg 13.5 



" carpus . . . 5.4 



" chela 1.0 



" third leg 19.0 



fifth leg 18.5 



" fifth somite of abdomen 3.0 



" sixth somite of abdomen 7.0 



Height of " " " 2.7 



Length of telson . . . . •» • . -. . . 5.2 



Station 321, N. Lat. 32° 43' 25", W. Long. 77° 20' 30", 233 fathoms. 

 Pandalus carinatus, sp. nov. 



Plate X. Figs. 3 -3 f . Plate XI. Figs. 1 -3. 



Female. — The surface of the carapax and abdomen is microscopically punc- 

 tate for the insertion of very minute hairs. The carapax including the rostrum 

 is about as long as the entire abdomen, but the carapax proper much shorter 

 than the rostrum and armed with a high dorsal crest nearly the whole length 

 and with four sharp and very conspicuous longitudinal carina? each side. The 

 rostrum is very slender, nearly horizontal toward the -base and slightly upturned 

 from a little back of the middle, and armed above, from near the slender and 

 acute tip, with thirteen conspicuous teeth in front of the orbit and four more 

 on the anterior half of the carapax, and beneath from near the tip to the front of 

 the eye with nine similar teeth. The uppermost of the four lateral carina? is in 

 a line straight back from the middle of the orbit, but is interrupted by a slight 

 depression and terminates in a small tooth just back of the middle, and is not 

 conspicuous on the anterior half of the carapax ; the second and third carina? 

 are continuous the whole length of the carapax, nearly parallel and slightly 

 curved, the upper terminating anteriorly in a conspicuous antennal spine 

 just over the base of the antenna, the lower in a similar but laterally more 

 prominent spine below the base of the antenna ; the lowest carina is a marginal 

 carina of the inferior edge of the carapax, which is more strongly incurved than 

 in the typical species of Pandalus. 



The eyes are rather small for the genus, pyriform, and black. The first seg- 

 ment of the peduncle of the antennula is broad, squamiform, excavated for the 

 reception of the eye, and furnished externally with a large lamellar process 

 terminating anteriorly in an acute angle in front of the eye. The second 

 and third segments are very short, taken together being scarcely longer than 

 their diameter. The outer flagellum is a little more than twice as long as the 

 peduncle, the basal half considerably thickened and hairy, but the terminal 



