THE SPIDER CEABS OF AMERICA 



139 



Fig. 50.-^Dasygtius depres- 

 sus (21873), maxilliped, x 

 5.26 



and fourth ambulatory legs. Rostrum triangular, tipped with a 



small, slightly capitate spine. E^'es large, flattened. Basal antennal 



article with dentate margins, terminating in two teeth, the outer the 



longer, incurved at tip. Second article (or first movable article) of the 

 antennules exceeding in length the fossa, and in 

 large specimens exceeding the rostrum. Maxil- 

 lipeds rather widely separated; ischium with a 

 shallow sulcus; merus strongly cordiform, very 

 narrow at base. 



Chelipeds of male stout, granulate; margins 

 of merus tuberculate; palm inflated, subglobular; 

 fingers narrowly gaping at base, finely crenulate 

 in the gape, crenate along meeting edges; dacty- 

 lus with a notch at base. Chelipeds of female 

 weaker than legs, palms not swollen. The ambu- 

 latory legs diminish in the order 3, 2, 4, 1, three 

 and two being nearly the same length; they are 

 granulate and hairy, the first pair conspicuously 

 hairy with a fringe of hair on either side; the 

 hairiness diminishes from the first to the 



fourth pair, and the granulation diminishes from the proximal to the 



distal end of each leg; dactyli unarmed. 



First segment of abdomen armed with a long, horizontal, conical, 



acute spine. In the male the sides of the last two segments are 



subparallel, the extremity 



broadly rounded. In the 



mature female the last or 



fused segment is much wider 



than long, almost covering 



the sternum laterally, the 



distal margin straight or 



slightly concave. Sternum 



of male flat, except in front 



of the chelipeds where, in 



both sexes, there is a smooth swelling and anterior to that a small 



spine between the maxillipeds. 



6'oZor.— Nearly white, with a very slight pinkish tinge. (Bell.) 

 Measurements. — Male (21874), length of carapace 20.6, width 19.8 



mm. Female (21874), length of carapace 20, width 20 mm. 



Range. — Gulf of California, Mexico; Galapagos Islands. Depth, 



6 to 26.5 fathoms. 

 Material examined. — ■ 



Gulf of California; April 30, 1888; Albatross: 

 Lat. 24° 18' 00" N., long. 110° 22' 00" W.; 26.5 fathoms; brk. Sh.; 



station 2823; 14 males, 22 females (21873). 



-Dasygyius depressus, male (21873), 



CHELA, X 2.66 



