part 1 garth: pacific oxyrhyncha 131 



Bay [Port Utria], Askoy (Garth, 1948) ; Ecuador: Galapagos Islands, 

 Hopkins Stanford Expedition (Rathbun, 1902b), Arcturus (Boone), 

 St. George (Finnegan), Velero III (Garth, 1946) ; Chile: Valparaiso, 

 H. Cuming (Bell, 1835b), (Milne Edwards and Lucas). 



Atlantic analogue: Stenorynchus seticornis (Herbst). 



Diagnosis: Rostrum as long as, or longer than remainder of cara- 

 pace, its lateral margins spinulous. A small spine located at end of basal 

 article of antenna. Legs exceedingly long and slender. 



Description: Male. Carapace naked, or minutely pubescent, and 

 smooth ; the branchial regions swollen. Rostrum about twice as long as 

 the posterior portion of the carapace, slender, cylindrical, armed with a 

 row of spines on each side, and sparsely hairy toward the extremity. A 

 strong spine on the basal segment of the antenna and a similar spine on 

 each side just behind the orbit. 



Chelipeds equal, slender, reaching nearly to the distal extremity of the 

 carpus of the first ambulatory leg ; ischium with a few small spines on the 

 inner side ; merus not quite as long as the hand, cylindrical, armed with 

 several spines along the side, and with three stout ones on the inner side 

 at the articulation of the carpus; carpus with two or three small spines 

 on the outer side and two at the distal extremity on the inner side ; basal 

 portion of the hand cylindrical and smooth but thickly covered with a 

 minute pubescence ; fingers nearly as long as the basal portion of the 

 hand, sparsely hairy, slender, nearly straight horizontally but curved in- 

 ward laterally at the tips, slightly channeled longitudinally, the prehensile 

 edges approximate, toothed toward the base, and serrate toward the 

 extremity, the serrations of the dactylus fitting accurately those of the 

 propodus. 



Ambulatory legs slender, cylindrical, and slightly pubescent; meral 

 segments armed with scattered spines, most of them on the distal two- 

 thirds of the length ; carpi with two or three spines about the middle, and 

 four at the distal extremities ; propodi armed with small, scattered spines 

 and spinules; dactyli beset with numerous spinules. 



First segment of the abdomen nearly as long as broad; second 

 broader and very short; third broadest of all the segments, the lateral 

 margins projecting into angles next the second segment and rapidly con- 

 verging toward the fourth; fourth narrowing very rapidly to the fifth; 

 fifth segment twice as broad as long, the lateral margins at first converg- 

 ing rapidly and then only slightly toward the sixth; terminal article, 

 composed of the sixth and seventh segments, completely anchylosed, about 

 twice as long as broad, the extremity angular but with the point rounded. 

 (Smith, modified) 



