52 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.21 



at by Rathbun (1923a, p. 73; 1925, p. 84, #.), who had only the brief 

 and inadequate descriptions of Stimpson and Lockington before her. 

 The distinctive pleopod of E. rubellula (Plate B, fig. 6) supports this 

 view. 



Key to the Pacific Species of Eucinetops 



la. Rostral horns simple, acute or rounded but always deeply 



separated, eyestalks extending well beyond postorbital spine 



2a. First movable segment of antenna narrowly rectangular, 



fingers of adult male gaping. Male pleopod with a sharp 



lateral projection lucasi 



2b. First movable segment of antenna strongly produced at ex- 

 ternal angle, fingers of adult male not gaping. Male pleopod 

 with a small, rounded lateral projection . . rubellula 

 lb. Rostral horns spine-tipped, basally joined for two-thirds of their 

 length, cornea extending only beyond postorbital spine, first 

 movable segment of antenna short and broad. Male pleopod 

 with a spinulous thumb process panamensis 



Eucinetops lucasi Stimpson 

 Plate A, Fig. 7; Plate B, Fig. 4; Plate 3, Fig. 1 



Eucinetops lucasii Stimpson, 1860b, p. 191, female, not pi. 2, fig. 3, 

 male. A. Milne Edwards, 1875, p. 119. Miers, 1879c, p. 644. 

 Rathbun, 1925, p. 85. Crane, 1937, p. 54, pi. 2, figs. 5, 6. Steinbeck 

 and Ricketts, 1941, p. 466. 

 Peltinia longioculis Lockington, 1877c, p. 76; type locality, Lower Cali- 

 fornia; male holotype not extant. 

 Type: Female holotype, length 9.1 mm, width 6.9 mm, no longer 

 extant. Male neotype, A.H.F. No. 494, from one mile northeast of 

 Cabeza Ballena, Lower California, Mexico, shore, March 11, 1949, 

 Velero IV station 1727-49. 



Type locality: Cape St. [San] Lucas, Lower California, Mexico; 

 John Xantus, collector. 



Localities subsequently reported, with collectors: Mexico: Lower 

 California: "Lower California," type locality of Peltinia longioculis 

 (Lockington) ; Gulf of California: Puerto Refugio and Conception 

 Bay (Steinbeck and Ricketts) ; Santa Inez Bay, Zaca (Crane). 

 Atlantic analogue: None. 



Diagnosis: Rostral horns strong, sharp, and cleft more than half 

 way to bases. Postorbital spine similarly attenuated. Eyestalks long, 



