CANCRID^ 43 



front and give to the whole a brownish tinge ; edges of teeth, under parts 

 and greater portion of legs, yellowish. There is little variation in color 

 among individuals and but small difference between fresh and alcoholic 

 specimens. 



Cancer gibbosulus (de Haan). 

 Plate X, fig. 29. 



Corystes (Tricliocera) gibbosula de Haan, Fauna Japon., 45, pi. ii, fig. 4> pl- xiii, 



fig. 3, 1835. 

 Tricocarcinus gibbosuhis Miers, Proc. Zool. Soc. London, 34, 1879. 

 Cancer gibbosulus Rathbun, Proc. U. S. Nat. Mus., xxi, 581, 1898.— Rathbun, H. A. 



E., X, 176, 1904. 



This species is represented in the collection by several specimens, the 

 largest measuring 35.5 by 25.5 mm., all obtained by dredging at moderate 

 depths — 10 to 20 fathoms. 



As no figures or detailed descriptions are easily available, the large 

 male whose measurements are given above is figured and the following 

 description given. 



Carapace markedly areolated, the most conspicuous depressions run- 

 ning back from the outer angle of the eye nearly to the posterior margin 

 of the carapace and enclosing between them the gastric, cardiac, and 

 intestinal regions. Gastric region divided by a groove beginning at the 

 median tooth of front, passing back and dividing like an inverted Y, the 

 arms of which form the anterior boundary of the cardiac region. The 

 lateral margins of the cardiac region converge posteriorly; from the 

 anterior end where they meet the arms of the Y, a pair of rather shallow 

 grooves run to the antero-lateral margin of the carapace, ending between 

 the fifth and sixth teeth. Carapace sparsely pubescent, hairs rather con- 

 spicuous and harsh. Antero-lateral margin, including outer angle of 

 orbit, with 9 strongly produced and forward curving teeth, all except first 

 two tipped with spines. Behind these on postero-lateral margin a well 

 marked tenth tooth directed upward and not laterally and a distinct spine 

 representing the eleventh. A conspicuous raised ridge along the postero- 

 lateral border and another across the posterior margin. Front with 5 

 acute teeth — not counting the supra-orbital — the three median of which 

 are the smaller and are separated from the tooth at inner angle of eye by 

 a distance rather greater than that occupied by the three. Supra-orbital 

 tooth acute, margin of orbit prominent, eyes and stalks normal. Antennae 

 large, stout, and conspicuously hairy, about equaling width of front ; outer 



y 



