40 J: REPORT OF COMMISSIONER OF FISH AND FISHERIES. [<iO] 



A. elegans. 



A. valens. 



Station. 



Length of second, gnathopod 



Length of ischium 



Length of merus 



Length of carpns 



Length of propodus 



Length of dactylus 



Length of firstparseopod 



Length of merus 



Breadth of merus 



Length of carpus 



Length of chela 



Breadth of chela 



Lengt h of dactylus : . 



LeiigUi of second per»opod 



Length of merus 



Breadth of merus 



Length of carpus 



Length of chela 



Breadth of chela 



Leugth of dactylus 



Length of third peraeopod 



Length of raeru8 



Length of carpus 



Length of chela 



Breadth of chela 



Lengt Ll of dactylus 



Length of fourth pera?opod 



Length of propodus 



Length of dactylus 



Lensjth of sixth somite of pleon 



Hight of sixth somite of pleon 



Length of telson 



Length of inner lamella of uropod . 

 Breailth of inner lamella of uropod . 

 Length of outer lamella of uropod . . 

 Breadth of lamella of uropod 



2083 



? 



14. ( 

 4.'. 



d 



1.3.0 

 3.8 

 2.4 

 2.1 

 2.0 

 1.0 

 9.5 

 2.9 

 1.0 

 1.8 

 2.2 

 0.5 

 1.0 



13.0 

 3.9 

 4.0 

 2.1 

 0.5 

 LO 



6.4 

 2.7 

 4.6 

 6.0 

 1.2 

 8.2 

 ].5 



Aristeus? tridens, sp. nov. 



(Plate IX, Figs. 1-6.) 



The carapax is not compressed, but broad and broadly rounded above. 

 The inferior angle of the orbit projects as a low spine, from which the 

 anterior margin retreats slightly to a stout antenna! spine projecting 

 somewhat laterally; and below this the margin is at first longitudinal, 

 and then transN erse, leaving an opening opposite the efferent branchial 

 passage. The rostrum is nearly as long as the rest of the carapax, with 

 a short dorsal carina at the base, armed with three large spiniform teeth 

 dire?ted forward, and of which the middle one is just over the orbit, the 

 carina extending back upon the gastric region, but not in front of the 

 anterior tooth, and the distal two-thirds of the rostrum, directed slightly 

 upwards, straight, slender, tai^ering, subcylindrical, naked, and un- 

 armed. The cervical sulcus is not distinctly marked, except for a short 

 distance below the hepatic region each side, but there is a deep anten- 

 nal sulcus which extends back beneath the hepatic region, and a slight 

 gastro-hepatic sulcus. There is a slight longitudinal carina on the he- 

 I)atic region ; a cariual ridge between the cardiac and the posterior part 

 of the branchial region ; a conspicuous carina extending back from the 

 antennal spine, and below this a submarginal carina the whole length 

 of the carapax, of which a broad margin below the carina is thin and 

 membranaceous. 



