404 



REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



[fiO] 



A. elegans. I A . valeDS. 



Station. 



Length of second gnathopod 



Length of ischium 



Length of merua. 



Leagtli of carpus 



Length ofproj)odus 



Leuglli of chictyhis 



Lengtli of lii.st parajopod 



Leugth of meiiis 



Breadth of mcrus 



Length of carpus 



Length of chela 



Breadth of chela 



Lengt h o F dactylus 



Length of .'second perseopod 



Lengt h of inerus 



Breadth of merus 



Length of carpus 



Length of cliela 



Breadth of chela 



Length of dactylus 



Leugth of third peraeopod 



Length of mems 



Length of car])us 



Lenu't li of i/licl I 



Breadth ot chela 



Length of dactylus 



Length of foiirt li pera?opod 



Lengt li of jiropodus 



Lengtli of (liictvlns 



Leujith of sixtli somite of pleon 



Hight of sixtli somite, of pleon 



Length of telson 



Length of inner lamella of tiropod . 

 Breailth of inner lamella of uropod . 

 Length of outer lamella of uropod . . 

 Breadth of lamella o f uropod 



Aristeus? tridens, sp. nov. 



(Plate IX, Figs. 1-G.) 

 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 antennal spine projecting 

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

 and then triMis\ erse, leaving an opening opposite the etferent 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 te«th 

 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, tapering, 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-hepati'c sulcus. There is a slight longitudinal carina on the he- 

 patic region ; a carinal 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 carai)ax, ©f which a brokid margin belov; the carina is thin and 

 membranaceous. 



