PART 1 GARTH : PACIFIC OXYRHYNCHA 405 



(4) The rostrum is said to be long, emarginate at the tip, the bifurcation 

 extending only one-third its length. In Libinia mexicana of this size the 

 bifurcation is less than one-third ; in Stenocionops ovata the rostrum is 

 short, while in S. beebei it is long but divergent from its base. Thus, of 

 the possible known Gulf of California species, only the one heretofore 

 known as S. contigua Rathbun meets Lockington's description of Chorili- 

 binia angusta. (In the above comparisons, specimens of both sexes and 

 in the size range of Lockington's 20 mm male and 23 mm female types 

 were used.) 



With the transfer of its type species, Chorilibinia angusta, to Steno- 

 cionops, Chorilibinia Lockington falls automatically to Stenocionops 

 Desmarest ; this in spite of the fact that its description calls for "eyes 

 concealed beneath the rostrum, as in Chorinus and its allies." Actually, 

 the eyes of Chorinus are not concealed beneath the rostrum, nor could 

 the eyes of Lockington's species be so concealed if the orbits be salient 

 as described. The fate of the orphaned species from Papua and north 

 Australia and from the Andamans that have been referred to Locking- 

 ton's genus is beyond the scope of this revision. Perhaps the name Choro- 

 libinia Has well can be used. 



Stenocionops ovata (Bell) 

 Plate Y, Fig. 2; Plate 44, Fig. 2 



Pericera ovata Bell, 1835b, p. 173; 1836, p. 60, pi. 12, figs. 5, 5o-q. 



A. Milne Edwards, 1875, p. 59. Miers, 1886, p. 76. 

 Libinia macdonaldi Rathbun, 1892, p. 238, pi. 29; type locality, Gulf 



of California, 71 fathoms, Albatross station 3011; male holotype, 



U.S.N.M. No. 16071. 

 Pericera triangulata Rathbun, 1892, p. 246, pi. 32, fig. 1 ; type locality, 



Gulf of California, 29 fathoms, Albatross station 3014; female 



holotype, U.S.N.M. No. 16066. 

 Stenocionops triangulata, Rathbun, 1898, p. 577; 1923b, p. 635; 1925, 



p. 461, pi. 165, fig. 1; P l. 266, fig. 1. Garth, 1946, p. 401, pi. 67, 



figs. 1, 2; P 1. 68, fig. 2. 

 Stenocionops ovata, Rathbun, 1910, p. 574; 1925, p. 459, pl. 264, figs. 



5-7. Boone, 1927, p. 167, fig. 54; 1938, pp. 201, 220, pis. 79, 80. 



Garth, 1946, p. 402. 

 Stenocionops macdonaldi, Rathbun, 1925, p. 460, pl. 268. Crane, 1937, 



p. 62. 



