PART 1 GARTH : PACIFIC OXYRHYNCHA 293 



Diagnosis: Rostrum bifurcate for half its length. Branchial spine 

 half as long as width of branchial region. Other carapace spines propor- 

 tionately longer than in typical Libidoclaea granaria. 



Description: Differs from Libidoclaea granaria [the typical form] 

 in the greater length of the rostrum and of certain spines of the carapace. 

 Rostrum in the largest male nearly half as long as the postrostral portion 

 of the carapace not counting the posterior spine, the horns occupying half 

 the length of the rostrum and diverging widely. Spine at the lateral angle 

 of the carapace the longest and equaling in length the width of the 

 branchial region. Four elongate median spines, namely, the intestinal, 

 cardiac, anterior, and posterior gastric ; the hepatic spine ; two branchial 

 spines (paired); preocular spine (paired). Tubercles of the carapace 

 fewer and lower than in [typical] L. granaria of similar size. In the 

 females examined the rostral horns less divergent than in the males, but 

 the long spines of the carapace very little if any shorter than in the male. 

 In the young only six spines noticeably longer than in L. granaria of the 

 same size, viz., the two rostral, cardiac, intestinal and lateral branchial 

 (paired). (Rathbun, 1925, modified) 



Material examined: Lund University Chile Expedition material: 

 five specimens from five stations, all Chilean. U. S. National Museum 

 material: two specimens from a single Albatross station, also Chilean. 

 (See Table 60) 



Measurements: Female: length without intestinal spine 30.7 mm, 

 width without branchial spines 21.5 mm, rostrum 7.7 mm, narrowest 

 width 2.2 mm, cheliped 28.7 mm, chela 13.5 mm, dactyl 6.7 mm, height 

 of palm 2.3 mm, ambulatory legs 50, 44, 40, and 37 mm, respectively. 

 Male: length 23.8 mm, width without branchial spines 15.7 mm, length 

 of branchial spine 7.0 mm. 



Color in life: Red-brown. (Dahl and Brattstrom, field notes) 



Habitat: Albatross specimens were recovered from green and blue 

 mud. (Rathbun, 1898) 



Depth: 61-1050 fathoms, with the exception of specimens obtained 

 by Plate at Calbuco in 10-15 fathoms, and attributed by Lenz to Libinia 

 hahni, a synonym of Libidoclaea smithi. Lund University Chile Expedi- 

 tion specimens were dredged in 60-300 meters, indicating a lesser mini- 

 mum depth for this, the deep water form. 



Size and sex: Lund University Chile Expedition specimens range in 

 size from young of 4.4 and 5.0 mm and a male of 9.7 mm to females of 

 from 26 to 34 mm. An ovigerous female (U.S.N.M. No. 21920) meas- 

 ures 51.8 mm in length. 



