CRUSTACEA NORTH PACIFIC EXPLORIXG EXPEDITION 169 



superior fissure or notch deep; inferior fissure occupied by a tooth. 

 £yes small and protractile, as in the Leucosidea. Antennulae suffi- 

 jciently long, without fossettes, and situated in the large inner hiatus 

 of the orbit. Antennae short, placed in the lower angle of the orbital 

 hiatus, beneath the antennulse. External maxillipeds very much 

 elongated, slightly gaping, but accurately fitting the margins of the 

 buccal area and anteriorly concealing the apices of the inner maxil- 

 lipeds ; exognath very narrow, and barely overreaching the ischium 

 of the endognath anteriorly ; meros of endognath broader than the 

 ischium, longitudinally sulcated along the middle and much pro- 

 duced anteriorly, its pointed apex reaching the front ; palpus con- 

 cealed as in the Leucosidea. Ambulatory feet as in Dorippc, but 

 with the dactyli scarcely falciform and non-costate. Abdomen 

 nearly as in Dorippe, but sexarticulate, and with the last joint 

 dilated. The male verges are in the coxje of the last pair of feet. 



In the shape of the carapax this curious form resembles Homola. 

 In general appearance and the structure of the feet, the posterior 

 t\v(j pairs of which are turned up over the back and prehensile, it is 

 closely allied to Dorippc. But the character of the external maxil- 

 lipeds and the position of the afferent branchial openings would far 

 remove it from this latter genus, and even entitle it to rank as a 

 •distinct family. 



275. TYMOLUS JAPONICUS Stimpson 



Pl.\te XIX, Fig. Z'Z'^ 



Tyiiioliis ia(^oiiicus Stimtsox, Proc. .\ca(l. Xat. Sci. Phila., x, p. 163 [61], 

 1S58.' 



Carapax nearl}' as Itjng as l)r()ad. ci)ns])icui:)usly areolatcd. the sur- 

 face minutely graiuilated. Sides convex, tridentate. the first tooth 

 at the summit of the he])atic region, the other two somewhat smaller 

 than the first, and placed rather close together on the branchial re- 

 gion. Teeth of the front small ])ut sharp, the two median ones most 

 projecting. Chelipeds of the male rough with granules and spinules 

 and some short sctre : a strong spine at the summit of the carjnis ; 

 hand >li(irt and high; lingers large, longer than the palm, concave 

 within. Ambulatory feet very slender. 



Color above bluish-gray in life, below dirty light brownish. 

 Dimensions of the carapax in a male: Length, 0.235; breadth, 0.24 

 inch. 



