PART 1 GARTH : PACIFIC OXYRHYNCH A 291 



spines curving downward and then forward and continued on the sub- 

 branchial and the pterygostomian regions, ending in a flat triangular 

 spine at the angle of the buccal cavity. Rostrum inclined downward ; 

 horns short, moderately spreading. Supraocular eave narrow, armed with 

 a sharp, ascending spine, and divided from the postocular cup by a narrow 

 fissure; this cup in lateral view showing a rounded lobe. This in turn 

 separated by a broad, curved sinus from the basal segment of the anten- 

 nae. The segment anteriorly narrowed and its outer margin occupied by 

 two stout curved spines. A well developed tubercle behind the orbital 

 sinus. Merus of the outer maxillipeds a little longer than wide, its antero- 

 external angle broadly rounded. 



Chelipeds and legs very long, the chelipeds not so long as the first 

 pair of ambulatory legs even in the fully developed male, there stouter 

 than the legs. Their surface rough with fine sharp granules, invisible to 

 the naked eye, but evident to the touch when the appendage is rubbed 

 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. (Rathbun, 1925, modified) 



Material examined: Lund University Chile Expedition material: 

 four specimens from two stations, both Chilean. U. S. National Museum 

 material: two specimens from a single Albatross station, Argentina. (See 

 Table 59) 



Measurements: Male: length including rostral but not intestinal 

 spines 35.9 mm, width without branchial spines 29.7 mm, rostrum 6.2 

 mm, narrowest width 2.9 mm, cheliped 41 mm, chela 19.8 mm, dactyl 

 10.3 mm, height of palm 3.6 mm, ambulatory legs 65, 58, 50, and 45 

 mm, respectively. Female: length 34.1 mm, width without branchial 

 spines 28.5 mm. 



Color in life: Scarlet. (Dana) "Red-brown." (Field notes of Dahl 

 and Brattstrom) 



Habitat: Specimens from off Gulf of San Matias, Patagonia, were 

 dredged by the Albatross in fine dark sand. An old male from Porto 

 [Puerto] San Pedro, Hassler, was encrusted with barnacles. 



Depth: 30-52 fathoms. Lund University Chile Expedition specimens, 

 however, were collected in 30-55 meters, suggesting a shallower minimum 

 depth for the species. 



