PART 1 GARTH : PACIFIC OXYRHYNCHA 43 



ately compressed, more slender, considerably longer than broad, not 

 turgid, and the fingers are without strong tubercles on the inner margins. 

 In the second variety (var. (3) the palm is shorter and much more 

 turgid, the fingers have between them (when closed) a much larger 

 hiatus, and the dactylus and sometimes the lower ringer (pollex) is 

 armed, on its margin, near the base, with a strong, rounded tubercle. 

 This form has usually, but not invariably, a more slender carapace and 

 longer rostrum. ... It is not a character peculiar to the old and large 

 males, . . . and as it is impossible to say to which of the two varieties 

 the females in the collection are to be referred, I refrain from applying 

 to them distinctive appellations. (Miers, 1886, p. 22) 



Material examined: A total of 425 specimens from 9 Hancock expe- 

 dition stations. (See Table 2) Independencia and San Nicolas bays, Peru. 

 An additional 14 specimens from 6 Hamburg Museum localities, plus 

 144 specimens from 19 Lund University Chile Expedition localities. 

 The former are distributed from Arica to Coronel, Chile, the latter 

 from Canal Calbuco, Golfo de Ancud, to Pta. Santa Maria, Estrecho 

 de Magallanes. 



Measurements: Largest Hancock expeditions specimen, a male from 

 station 829-38: length 58.7 mm, width 39.5 mm, rostrum 15.4 mm, 

 cheliped 85 mm, chela 35 mm, dactyl 16 mm, walking legs 156, 145, 

 133, and 123 mm, respectively. Female: length 38.5 mm, width 26 mm. 

 The largest specimen on record is apparently a 69 mm male without 

 rostrum collected by the Mission Scientifique Cap Horn (A. Milne 

 Edwards, 1891). A 68 mm male with rostrum intact and a 53.5 mm 

 ovigerous female are included among Lund University Chile Expedi- 

 tion collections from St. M21, Canal Calbuco, Golfo de Ancud. 



Color: "In the fresh state this crustacean should be of a greenish- 

 brown color." (Guerin) An excellent colored illustration appears in 

 Milne Edwards (1836, pi. 34 bis, fig. 1). Unfortunately, no color notes 

 were taken of living Hancock Expedition or Lund University Chile 

 Expedition specimens. 



Habitat: Recovered from bottoms of sand or sandy mud with asso- 

 ciated shell or rock. Large individuals among Hancock expeditions 

 specimens were decorated with an alga which on the basis of sterile 

 material could be identified by Dr. E. Yale Dawson only as either 

 Rhodymenia corallina (Bory) Greville or R. howeana Dawson. Lager- 

 berg (1905) enumerates various epizooites, including sponges, hydroids, 

 bryozoans, and tube worms. Lund University Chile Expedition speci- 

 mens were covered with the sponges Haliclona topsenti (Thiele), H. 



