ISer..] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



187 



the posterior margins deeply incised in tbe middle on the third, fourth, 

 and lifth. The sixth somite is short, not more thnn a fonrtli l()n<jjer than 

 the fifth, and fully three-fourths as hii;h as long-. The telson i.s much 

 longer than the sixth somite, has a conspicuous dorsal sulcus, which 

 becomes broad and shallow posteriorly, and of which the margins ter- 

 minate in a small spiniform process either side of the long and rather 

 broad but acute tip. Tlie inner lamella of the uropod is shorter than 

 the telson, ovate-lanceolate, and about a third as broad as long. The 

 outer lamella is approximately as long as the telson, more than a third 

 as broad as long, and semi-elliptical, the outer margin being straight 

 and extending to the extreme end of the lamella. 



In general appearance this species strikingly resembles Hymenopencciis 

 viodestus, described above. The form of the carapax is very similar, 

 although there are marked differences in the rostrum, dorsal carina, 

 and the spines of the anterior margin, as shown in the descriptions. 

 The pleon alone would be scarcely distinguishable from that of the 

 Hymenopenwus. 



Measurements in miUimeters. 



Catalogue number 

 Station . . - 



7266 

 2121-2 



Sex 



J.ensth from lip of rostrum to tipof telsou i 43 



- --■-•■ 14.0 



3.5 

 8.0 

 6.0 

 4.0 

 3,1 



Length of t-arapas iucludiug lostrum. 



Length of rostrum 



Height of caiJipax 



Breadth of carapa.x . 



Length of e.\ estalk and eye 



Greatest diameter of eve 



LeDgth of autounal scale 



LreaiUli of antennal scale 



Length of second gnathopod 



Leuglh of first peia-opod 



Length of caipus 



Length of chela 



Breadth of chela 



Length of dactylus 



Length of second perteopod 



Lengtli of carpus 



Leugth of chela 



Breadt h of chela 



Length of dactylus 



Length of third pera?opod 



Length of merus 



Lengtli of carpus 



Length of chela 



Breadth of chela 



Length of dactylus 



Length of fourth perneopod 



Lengt h of merus 



Length of cai-pus 



Length of propodus 



Length of dactylus 



Lengtli of filth perseopod 



I-ength of merus 



Lengtli iif carpus 



Length oi piopodus 



J^engtli of dai;tylu8 



*englh (if sixth somite of pereon 



Height of sixth somite of pereou 



Lengt h of telson 



Length of inner lamella of uropod 



Breadth of inner lamella of uropod 



Lengtli ot outer lamella of uropod 



Breadth of outer lamella of uropod . . . 



21 

 14 

 3." 



2.' 

 0. ) 

 1.' 

 20 

 7.( 

 3. ( 



0. ( 



1. J 

 26 



6.; 

 11.' 



3 ; 



0. ! 



2.( 



2L! 



5. < 



2.6 

 31 



7. 

 8. 



69 



23.4 

 7.6 



11.3 

 8.5 

 6.0 

 5.0 



11.7 

 4.1 



32 



22 

 6.0 

 3 8 

 1.1 

 2. C 



31 



12 

 4.4 

 

 2. S 



43 



12.0 



2'.0 

 5.2 

 0.8 

 2.9 



3:i 

 8,0 

 9 7 

 5.2 

 4.0 



44 



11.5 



12.0 



12.7 

 5.0 

 7.5 

 0.5 



11.5 

 9.0 

 3.0 



10.0 

 3.9 



