THE SPIDER CRABS OF AMERICA 83 



A strong, spine-pointed, interantennular tooth. Orbital arch un- 

 armed. A conical spine or tubercle on first segment of abdomen. 



Merus and carpus of chelipeds tuberculate and spinous; merus 

 triangulate, more or less swollen, upper margin spinous, the row of 

 spines continued on the carpus. Manus roughly granulate, either 

 wide and swollen or narrow and compressed (a less developed form) ; 

 fingers gaping for more than half their length, dactylus with a large 

 tooth midway of its length; immovable finger with a smaller basal 

 tooth; these teeth are much reduced in the narrow form of manus. 

 The two forms of cheliped are found in individuals of the same size 

 and from the same locality. 



The propodus of the ambulatory legs usually greatly exceeds in 

 length the carpus, but occasionally the carpus nearly equals or even 

 exceeds the propodus. The latter is dilated below* and the distal 

 half of this expansion, where the dactylus closes, is margined with a 

 thick fringe of hair. The dactylus, as a rule, is more than half the 

 length of the propodus. 



CbZor.— Greenish brown (Guerin). General color, light green; 

 lateral portions of carapace and feet covered with a grayish down 

 (Milne Edwards and Lucas). 



Measurements.— Male (21887), length of carapace including rostrum 

 69, length of rostrum 12, width of carapace 51.6 mm. 



Variation. — Extremely variable, especially as to length and direc- 

 tion of horns, prominence and sharpness of tubercles and spines, 

 amount of pubescence, development of chelipeds of adult male, and 

 relative length of carpus and propodus of legs. In the yoimg and 

 immature the horns are more horizontal than in the old and are more 

 likely to diverge towards the tips; as they grow the horns gradually 

 arch upward, the tips get in contact or occasionally overlap. 



Range. — ^From Peru to Strait of Magellan and northward to Rio 

 de Janeiro (Bell); Falkland Islands. Depth, 4 to 77.5 fathoms. 



Material examined. — See table, page 82. 



EURYPODIUS LONGIROSTRIS Miers 



Plate 35, figs. 1 and 2 



Eurypodius longirostris Miers, Challenger Rept., vol. 17, 1886, p. 23, pi. 5, 

 figs. 1, la (type-locality, "off the coast of Chiloe," lat. 50° OS' 30" S., 

 long. 74° 41' 00" W., 175 fathoms, station 308 'S; type in Brit. Mus.).— 

 Stebbing, Proc. Zool. Soc. London, 1900, p. 527. 



Euripodius longirostris Murray, Challenger Rept., Summary, pt. 2, 1895, 

 p. 1152. 



Diagnosis. — Rostrum of male inclined strongly upward. Supra- 

 orbital margin armed with a spine. Carapace narrow, length with- 

 out rostrum one and a fourth times its width. 



" "Off the coast of Chiloe" is an error, as station 308 is much farther south, off northeastern end of Madre 

 Island. See Challenger Summary, part 2, 1895, p. 1149. The error was due to a mix-up with station 303; 

 see Summary, p. 1138. 



