182 PEOCEEDINGS OF UNITED STATES NATIONAL MUSEUM. [1885. 



about a sixth longer than the inner, rather less than three times as 

 long as broad, and the thickened outer margin extends very nearly to 

 the tip. 



In the male the appendages of the first pleopods are very large 

 squarish lamellar plates with the outer and distal margins slightly 

 thickened, the latter somewhat irregularly lobed, and the mesial por- 

 tion very thin and longitudinally plicated. There are three stifi" chitin- 

 ous stylets at the base of the inner ramus of the second pleopods, the 

 usual i)air on the mesial side and a single small one on the opposite 

 side, the anterior of the two mesial ones is much the larger and is stout 

 and deeply channeled for the reception of the inner, which is shorter 

 and much more slender. 



Taken by the Albatross in the Caribbean Sea, station 2125, February 

 18, 1884, north latitude 11^ 43', west longitude 69o 9' 30", 208 fathoms, 

 yellow mud and sand, temiierature 50°.7. Fourteen males and four 

 females (6907 and 6908). 



Meaauremenis in millimeters. 



Ca.talogne number 



Station 



Sex 



Leugth from tip of rostrum to tip of telson 



Lengtli of carapax including rostrum 



Length of rostrum 



Height of carapax 



Breadth of carapax 



Length of eye-stalk and eye 



Greatc^st diameter of eye 



Length of antennal scale 



Breadth of antennal scale 



Length of second gnathopod 



Length of first perisopod 



Length of carpus 



Length of chela 



Breadth of chela 



Length of dactylus 



Length of second perseopod 



Length of caipus 



Length of chela 



Breadth of chela 



Lenffth of dactvlus 



Length of third perseopod 



Length ofmerus 



Length of carpus 



Length of chela 



Breadth of chela 



Length of dactylus 



Leugth of fourth peraeopod 



Length of merus 



Length of carpus 



Length of propodus 



Length of dactylus 



Length of fifth perseopod 



Length of merus 



Length of carpus 



Length of propodus 



Length of dactylus 



Length of sixth somite of pereon 



Height of sixth somite of pereon 



Length of telson 



Length of inner lamella of uropod 



Breadth of inner Inmella <'f uropod 



Length of outer lamella of uropod 



Breadth of outer lamella of uropod 



6907 

 2125 



? 

 190 



84 



37 



28 



23.5 



10 



12 



34 



12 



72 



49 



13.5 

 8.8 

 2.7 

 5.8 



64 



26 

 8.0 

 2.1 

 4.7 



84 



22 



38 

 8.9 

 L8 

 4.5 



72 



22 



23 



10 

 6.0 



94 



29 



29 



17 

 5.0 



19.3 



15 



26 



24 

 8.0 



30. 5 

 9.3 



