PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 417 



branchiil regions are i^rominent, tuberculose, and pitted, particularly 

 upon the outer surface, and rise at the summit into a prominent spiui- 

 form tubercle either side, on a line with the anterior cardiac tubercle. 



Tlie chelipeds are very nearly as in L. Pourtalesii, but appear to be pro- 

 portionally a little longer, and, judging from A. Milne-Edwards's figure 

 of Pourtalesii, to have the marginal teeth more acute and more deeply 

 laciniated. The nieri of all the ambulatory legs are spinulose on both 

 the upper and lower edges, as in Pourtalesii, while in the last i:)air there 

 are, in addition, similar s[)ines on the upper edge of the carpus and one 

 near the middle of the upper edge of the i^ropodus. The dactyli are 

 about as long as the corresponding j)ropodi, are very slightly com- 

 jiressed, and are covered with a dense velvet-like pubescence, except at 



the tips. 



Measurements. 



Leniith of cnrapax 



Brcadtli incliiilin^ lateral spines .. 



Katio (if leuj,th to breadth 



Breadth cxcludiu'^ lateral spines . 

 Leuitli of cheliiied fidly extended 

 Li'ULi'th of iiienis of eheliped 

 Length of propodus of eheliped. .. 



(Sta. 872.) 



mm. 

 32.8 

 41.0 

 1 : 1. 25 

 35.3 

 85.0 

 32.0 

 39.0 



The cousi)icuous cervical emargination of the antero-lateral margin of 

 the carapax, the cervical depression above the margin, the different 

 antero-lateral margin in front of the cervical suture, and the spines or 

 tubercles on the carpi and propodi of the last ambulatory legs appear 

 clearly to distinguish this si:)ecies from the Pourtalesii. The antero- 

 lateral margin between the cervical suture and orbit appears to be more 

 like L. liyponciis, as figured by A. Milne-Edwards, though in other re- 

 spects the lujponcus is unlike the present sj^ecies. 



Stations 805 to 867, 872 j 65 and 86 fathoms; three specimens, all 

 females. 



Cancer borealis Stimpson. — Sraitli, Traus. Conn. Acad., v, p. 39, pi. 8, 1879. 



Stations 865, 871, 872, 875, 877, 878, 879 ; 65 to 225 fathoms. Most of 

 the specimens are small, and the largest is only 56"^'" in breadth of 

 carapax. 



Large specimens of this species were taken in abundance in the shal- 

 low waters oft' Newport. 



Geryon quinquedens Smith, Trans. Conn. Aca(l.,T, p. 35, pi. 9, figs. 1, 2, 1879, 



Stations 881, 893 ; 252 and 372 fathoms. 



This species grows to a much greater size than any of the specimens 

 from which my original description was drawn. A male from 21'0 fath- 

 oms, off ]Nova. Scotia, north latitude 42<^ 37', west longitude 62° 55', 

 presented to the National Museum by Capt. G. A. Johnson and crew of 

 Proc. Nat. Mus. 80 27 Jan. 10, 1881. 



