402 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 21 



2a. Rostrum long, % or more carapace length. Five median 

 dorsal spines. Hepatic region with only one spine; two 

 principal lateral branchial spines 



3a. Rostral horns widely divergent; rostrum from y 5 to 

 % carapace length. Never more than three lateral 

 spines, one hepatic and two branchial . . beebei 

 3b. Rostral horns moderately divergent; rostrum about 

 % carapace length. Usually an incipient anterior 

 branchial spine in addition to the three principal lateral 



spines ovata, under 26 mm 



2b. Rostrum short, from % to y i2 length of carapace. Nine 

 median dorsal spines in the adult, with as many as three 

 lacking in adolescent specimens. Hepatic region with two 

 or more spines. Three principal lateral branchial spines, 

 sometimes with accessory spinules . ovata, over 26 mm 



lb. Rostral horns curved, arching away from each other, most 

 closely approximated at midpoints .... angusta 



Stenocionops angusta (Lockington), new combination 

 Plate Y, Fig. 1 ; Plate 45, Fig. 1 



Chorilibinia angustus Lockington, 1877c, p. 69. 



Chorilibinia angusta, Miers, 1879b, p. 7; 1886, p. 45. Rathbun, 1925, 



p. 309. 

 Pericera contigua Rathbun, 1892, p. 247, pi. 32, fig. 2; type locality, 

 Gulf of California, 21 fathoms, Albatross station 3005; female 

 holotype, U.S.N.M. No. 16067. 

 Stenocionops contigua, Rathbun, 1898, p. 577; 1925, p. 451, pis. 162, 

 163; pi. 266, fig. 2. Crane, 1937, p. 62. 



Type: Two males and one female, cotypes; originally deposited in 

 the California Academy of Sciences, no longer extant; male cotype length 

 20 mm, width 12 mm, female cotype length 23 mm, width 15 mm. 



Type locality: Gulf of California, Mexico; W. J. Fisher, collector. 



Localities subsequently reported, with collectors: Gulf of California, 

 Mexico: Adair Bay, 11 fathoms, and off San Jose Island, 21 fathoms, 

 Albatross (Rathbun, 1892, as Pericera contigua) ; San Lorenzo Channel, 

 8 fathoms, and inside Ceralbo Island, 10 fathoms, Albatross (Rathbun, 

 1898) ; Adair Bay, 11 fathoms, Santa Inez Bay, 30 fathoms, Zaca 

 (Crane). West coast of Lower California: Magdalena Bay, Hassler 

 (Rathbun, 1925) ; all the preceding as Stenocionops contigua. 



Atlantic analogue: Stenocionops furcata (Olivier). 



