PART 1 GARTH : PACIFIC OXYRHYNCH A 281 



Measurements: Largest specimen, male from Canal Chacao, Chile: 

 length 23.7 mm. Ovigerous female, Peru: length 21.6 mm, width 15.7 

 mm, rostrum 4.0 mm, width 2.6 mm, cheliped 17.3 mm, chela 6.7 mm, 

 dactyl 3.5 mm, ambulatory legs 21.5, 18.1, 15.0, and 13.3 mm, respec- 

 tively. 



Color in life: Carapace and chelipeds yellow tinged with reddish. 

 (Milne Edwards and Lucas) Reddish brown; the hands red. (Bell, 

 probably from preserved specimens) "Gray or gray-brown with red 

 claws." "Claws brilliant red." (Field notes of Dahl and Brattstrom, of 

 Chilean specimens) 



Habitat: Among seaweed (?). (Lenz) Sandy bottom; sand and 

 rock bottom. (Miers) Hancock expeditions specimens were collected on 

 rocky shore; the dredged specimen was recovered from mud bottom. 

 Lund University specimens were covered with a variety of epizooites, 

 including sponges, hydroids, and ( ?)ascidians. 



Depth: Shore to 70 meters. 



Size and sex: Males in the small Hancock series measure 9.0 and 

 14.5 mm, females 15.5 to 21.6 mm, the latter ovigerous. Males in the 

 larger Lund University series measure 9.9 to 23.7 mm, females 10 to 22 

 mm, the latter post-ovigerous. 



Breeding: Ovigerous females were encountered by Hancock expedi- 

 tions in Peru in February and a post-ovigerous female by Lund Uni- 

 versity collectors in Canal Chacao, Chiloe, in late February. 



Remarks: The Hancock series lacks a male comparable in size to the 

 30 x 14.6 mm specimen from the Guerin collection in the Museum of the 

 Academy of Natural Sciences of Philadelphia (Rathbun, 1925, p. 286). 

 The 14.5 mm male, however, yielded a first pleopod (Plate Q, fig. 5) 

 closely resembling that of Pelia. When one considers that the basal 

 antennal article of Pelia pacifica is broad as compared to that of Pelia 

 tumida, and that the peduncle (first two movable articles) is wider than 

 in that species and extends to the tip of the rostrum also, it is apparent 

 that characters other than those given by Rathbun (1925, p. 194) must 

 be used in any key separating Pisoides from Pelia. In addition to its larger 

 size, Pisoides is tuberculate and spinate, particularly at the extremities 

 of the meral segments of the cheliped and legs, and usually lacks the 

 peculiar interlocking arrangement of the fingers of the adult male in 

 Pelia. However, the male specimen from S of Punta Nagle, Golfo de 

 Quetalmahue, Canal Chacao, has claws with a gape like those of Pelia. 



Although the specimens at hand, because of their small size, do not 

 add to the descriptive features of the species as set forth by Milne Ed- 



