12 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 5 



four tufts of curved setae arranged in a rectangle. Branchial regions 

 flattened, a longitudinal row of curved setae traversing their entire 

 length and a tuft of the same at inner angle. Hepatic region tumid, 

 having the appearance of a mammary structure, and bearing a short, 

 forward-directed, cylindrical, truncate spine. Pterygostomian ridge also 

 provided with a similar, though smaller, spine at its mid-point. Rostrum 

 thick and broadly triangular at base, transversely convex, nearly twice 

 as long as broad, acuminate, the apex prolonged into a slender spine 

 armed with two double rows of curved setae, the outer of which ex- 

 tend almost to the bifurcate tip. Orbits spinulous above, the largest 

 spinule in some specimens becoming a minute preorbital spine. Post- 

 orbital spine large, concave anteriorly, convex posteriorly, outer margin 

 laciniate. 



Basal antennal article narrowed anteriorly, a spine or cluster of 

 spinules at external angle, bearing a thick, compressed, granular ridge 

 which parallels the smooth inner, rather than the spinulous outer, margin. 

 Antennae long, slender, provided with long yellow hairs which interca- 

 late with those of the rostrum; second movable joint reaching tip of 

 rostrum. Antennular fossae large, incompletely divided, their anterior 

 margins granulate ; interantennular septum bearing a prominent, berried 

 tubercle. Merus of third maxilliped with inner angle produced into a 

 thin, triangular blade, outer angle rounded ; first joint of palpus moder- 

 ately compressed. Segments of male sternum convex, deeply separated, 

 two prominent tubercles at level of coxae of chelipeds. First abdominal 

 segment bearing two median setose tubercles, the remaining segments 

 one each, with the exception of the last, which has none. 



Chelipeds of male robust, hairy, and spinulous. Merus trihedral, the 

 curved lower margin armed distally with numerous spines, of which 

 three or four are particularly conspicuous, and proximally with a fringe 

 of hairs continued on the ischium. Carpus provided with two or three 

 prominent tubercles, each bearing a cluster of spinules, of which the 

 superoproximal is outstanding in the type specimen. Palm inflated, 

 roughened, a row of five or six spinules along its inner superior margin, 

 another row of finer spinules along its inferior margin, and a transverse 

 row across the palm; finer spinules of outer surface irregularly placed 

 and interspersed with yellow hairs of varying lengths. Fingers gaping 

 at basal half in a broad oval, broken by a prominent tooth on the mov- 

 able finger, meeting in distal half, incurving; length of the movable 

 finger equaling or exceeding length of palm. 



