PART 1 GARTH : PACIFIC OXYRHYNCHA 345 



Localities subsequently reported, with collectors: Juan Fernandez 

 Island, L. H. Plate (Lenz, as Paramithrax peroni) , Hassler Expedition 

 (Rathbun, 1925). The early records from Halt Bay and Porto Buono 

 [Puerto Bueno], Chile, Magenta (Targioni-Tozzetti, 1872a, 1872b, 

 as Paramithrax peronii?), are believed instead to represent Eurypodius 

 latreillci Guerin. 



Atlantic analogue: None. An eastern Pacific representative of a 

 western Pacific genus. 



Diagnosis: Differing from Paramithrax peroni in the following par- 

 ticulars, according to Balss: rostral spines diverging more strongly, a 

 serrate crista adorning the carpus of the cheliped, but two branchial 

 spines [three, including the anterior branchial] instead of four, and a 

 large intestinal spine. Aperture of the male first pleopod located in a 

 saclike outgrowth protected by a fleshy flap and concealed by a half- 

 twist near the apex. Several rows of setae present, the most prominent 

 extending to the slender, pointed tip. 



Description: Carapace covered with curled hairs, finely granulate 

 and armed with a few spines ; of the median spines, two nasogastric, one 

 intestinal ; two pairs of submedian spines, one pair cardiac, the other on 

 the posterior margin. Supraocular eave provided with a strong anterior 

 and a small posterior spine, followed by a longer spine half as long as 

 the postorbital spine ; the latter with a lobe or tooth on its outer margin 

 and denticulate on inner margin. Two marginal hepatic spines, subequal, 

 directed outward ; followed by a small branchial spine, and at the widest 

 part of the carapace by a strong spine; another similar spine above 

 posterolateral margin. Rostral horns very divergent, acuminate. Basal 

 article of antenna with a large, flat, falciform tooth or lobe at outer 

 angle and a small, sharp tooth at inner angle ; inner margin denticulate. 

 Flagellum extending for half its length beyond rostrum. Two sharp 

 spines on the eye, one anterior, on the edge of the cornea, the other 

 superior, overlapping cornea. Merus of outer maxillipeds subquadrate, 

 with the inner, distal angle deeply notched, a tooth at outer angle of 

 notch ; palpus long and stout. 



Merus and carpus of chelipeds ornamented with flat lobes or teeth ; 

 about six of these forming a superior border on the merus; and five 

 smaller lobes marking the lower-outer border ; inner and outer surfaces 

 unevenly granulate. On the carpus three or four lobes forming a con- 

 tinuous crest above ; only one below ; inner and outer surfaces uneven, 

 the outer having two large tubercles. Upper carina of palm sharp, distally 

 wanting. Fingers crenulate within, moderately gaping, no large basal 



