THE SPIDER CRABS OF AMERICA 225 



two stout curved spines. Behind the orbital sinus there is a well- 

 developed tubercle. 



The merus of the outer maxillipeds is a little longer than wide, its 

 antero-external angle is broadly rounded.^- 



The chelipeds and legs are very long, the chelipeds not so long as 

 the first pair of ambulatory legs even in the fully developed male, 

 where they are stouter than the legs. Their surface is rough with 

 fine sharp granules which, if invisible to the naked eye, are evident 

 to the touch when the appendage is ru})bed from the distal end toward 

 the carapace. Palms of old male compressed, a little narrower at 

 proximal end than elsewhere; fingers about two-thirds as long as 

 upper margin of palm, gaping at base and armed with low teeth on 

 their prehensile edges. A smooth longitudinal depression on the 

 upper surface of the carpus of the ambulatory legs. 



Measurements. — Male (Milne Edwards and Lucas), length of cara- 

 pace 67, width 56 mm. Male (Dana), length 2% inches (60.4 mm.), 

 width without spines 2}/^ inches (54 mm.). Male (Miers), length and 

 width about 36 mm. Immature male (21919), length of carapace 

 from posterior margin to tip of horns 36.2, width with spines 38. 

 without spines 30 mm. Male (1870, M. C. Z.), length of carapace 

 from posterior margin to tip of horns 90.5, extreme width 86.2, 

 length of cheliped, approximately 235, length of propodus of cheliped 

 on lower margin about 116, length of same on upper margin 74.2. 

 length of dactylus of cheliped about 47 mm. 



Color. — Carapace yellowish white, ambulatory legs of same color 

 but much darker (Milne Edwards and Lucas). Scarlet (Dana). 

 Yellowish-brown, in spirit (Miers). 



Range. — From Valparaiso, Chile, to off Gulf of San Matias, Pata- 

 gonia; 30 to 52 fathoms. 



Material examined. — - 



Porto San Pedro, Island of Chiloe, Chile; U. S. C. S. S. Hassler; 

 1 old male encrusted with Balanus (1870, M. C. Z.). 



Off Gulf of San Matias, Patagonia: lat. 40° 03' 00" S.; long. 58° 

 56' 00" W.; 52 fathoms; fne. dk. S.; January 13, 1888; station 2767. 

 Albatross; 200 specimens of medium and small size (21919) ; the male 

 measured above is the largest specimen of this lot. 



Other records. — 



Near Valparaiso (Milne Edwards and Lucas) . 



Off Cape Tres Montes, Chile; lat. 46° 53' 15" S.; long. 75° 12' 00" 

 W.; 45 fathoms; station 304, Challenger (Miers). 



« This is contrary to the form of the merus given in the atlas of d'Orbigny's "Voyage," pi. 4, fig. 1 6, 

 where the merus has a prominent tooth at the antero-esternal angle. I am disposed to believe that the 

 artist may have included the angle of the buccal cavity with the merus. This view is substantiated by 

 the correspondence in all essentials of the figures of the other parts as represented by the three authors 

 above cited. Compare pi. 4, fig. 1 a of M. Edwards and Lucas with pi. 1, flg. 3 c of Dana and pl.9, flg.2 6 

 of Miers; also pi. 3 of M. Edwards and Lucis with pi. 1, fig. 3 a of Dana aud pi. 9, fig. 2 of Miers. 



