508 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



setsB, is stout and about twice as long as the distal diameter of the pro- 

 podns. 



There is no carina on any somite of the pleou, but the dorsum of the 

 third somite projects back in a small, vertically compressed spine over 

 the fourth somite, in the dorsum of Avhich there is an obscure, Jind pos 

 sibly accidental, sulcus. The pleura are similar in outline to those of 

 Acantliephyra Agassizii, but the second is relatively a little broader, 

 the third and fourth more evenly rounded posteriorly, and the tifth a- 

 little more obtuse at the posterior angle. The sixth somite is about 

 two-thirds as long as the carapax, excluding the rostrum, and less thao 

 half as high as long. 



The telsou is very much longer than the sixth somite, tapers into a 

 very long and narrow tip, and is armed along the distal two-thirds ol 

 either edge with numerous (twenty to twenty-five) small aculei. The 

 inner lamellae of the uropods are about as long as the sixth somite of 

 the pleon, lanceolate in outline, and less than a sixth as broad as long. 

 The outer lamellne reach to near the tip of the telson, are about six 

 times as long as broad, and evenly rounded at the tips. 



Measurements in millimelrrs. 



Sex. 



Length from tip of rostrum to tip of telson 



Length of carapa-s, Including rostrum 



Length of rostrum • 



Length of carapax, excluding rostrum 



Height of carapax 



Breadth of carapax .- 



Length of eye-stalk and eye 



Greatest diameter of eye 



Length of first pera;opqd 



Lengtli of merus 



Breadth of merus 



Length of carpus 



Length of chela 



Breadth of chela 



Lrn ;th of dactylus 



Length of tiltli porteopod 



Length of merus 



Breadth of moras 



Lenglh of carpus 



Length of jiropoclus 



Length of Am;\\ lus 



Length of sixth somite of pleon 



Height of sixth somite of pleon 



Length of telson 



Length of inner himella of uropod 



Breadth of inner himella of uropod 



Length of outer lamella of uropod 



Breadth of outer lamella of uropod 



56.0 



17.0 

 4.8 



13.2 

 8.3 

 6.2 

 2.8 

 1.7 



16.0 

 4.6 

 1.7 

 2.9 

 5.0 

 0.8 

 1.8 



20.5 

 7.5. 

 2.7 

 2.9 

 5.8 

 0.8 

 8.8 

 4.1 



11.0 

 8.6 

 L3 

 9.8 

 1.6 



Station 2083, September r>, 1883, north latitude 40° 26' 40", west 

 longitude 07° 5' 15", 959 fathoms, gray mnd, temperature 40°, one 

 female (7156). 



Benthoecetes Bartletti Smith. 



Beuthefiicumns ? BuriletU Smith, IJiill. Mns. Comp. ZooL, x, p. 82, pi. 14, figs. 



1-7, 1882. 

 Bentlmcetes BarUctti Smith, Report U. S. Fish Com., x, for 1882, p. 391, pi. 



10, lig. 8, 1884. 



Additional specimens of this species taken the present season show 

 that the dactyli of the fourth and fifth perseopods are, as I had supposed, 



