no. 2075. FISHES FROM SOUTHERN CALIFORNIA— GILBERT. 



345 



List of stations. 



4306 

 4307 

 4258 

 4366 

 4410 

 4413 

 4421 

 4423 

 4510 

 4523 

 4533 



Off San Diego 



Fathoms. 

 207-497 

 169-496 

 167-191 

 176-181 

 178-195 

 152-162 

 229-298 

 216-339 

 91-184 

 75-108 

 144-293 



do 



do 



do 



Off Catalina Island 



do 



Off San Nicholas Island 



do 



Monterey Bay 



do 



do 





Genus XENERETMUS Gilbert. 



Key to species of Xeneretmus. 



i 1 . A single upright spine on terminal rostral plate. First dorsal spine inserted on 

 seventh plate of dorsal series, or occasionally on the extreme anterior edge of 

 the eighth. 

 b 1 . Xenopyxis. 1 — Cheek below suborbital crest naked, without plates. Only one 

 spine developed on preopercular margin. Membrane between thickened 

 modified and normal unmodified pectoral rays not more deeply notched than 

 between other rays. Terminal rostral plate not ending at each side in a free 

 spine. No blue spots. 

 c 1 . A single barbel at tip of maxillary. Branchiostegal membrane with a wide 

 free fold posteriorly. Pectoral rays 14 in number, 4 or 5 of the lower rays 

 thickened. Plates on breast reduced in adults, the anterior usually not in 

 contact. Body slender; spines slender. No black bar on base of dorsal fins. 

 d 1 . A series of 3 to 5 spines on eye-ball. Adults with a well-developed series 

 of paired plates behind vent. Modified pectoral rays 5 (rarely 6) in 

 number, none of them greatly produced beyond the succeeding rays, 

 the notch shallow between modified and unmodified portions of fin. 

 Posterior margin of gill-membranes forming a curve on middle of throat. 

 Spinous dorsal with a narrow jet-black margin of equal width throughout. 

 Sides without conspicuous dark blotches. Median series of plates on 

 caudal peduncle 14 to 16 in number. Dorsals more posteriorly in- 

 serted. latifrons. 



d 2 . No spines on eye-ball. Series of paired plates behind vent very incon- 

 spicuous. Modified pectoral rays 4 in number, the uppermost much 

 produced beyond the succeeding rays, a deep notch between modified and 

 unmodified portions of fin. Posterior margin of gill-membranes angulated 

 on middle of throat. Spinous dorsal with jet-black margin, which widens 

 anteriorly to include greater part of fin. Sides with conspicuous dark 

 blotches. Median series of plates on caudal peduncle 17 or 18 in number. 



Dorsals more anteriorly inserted leiops. 



c 2 . Two barbels at tip of maxillary. Branchiostegal membrane posteriorly with 

 extremely narrow free fold. Pectoral rays 16 in number, the lower 6 or 7 thick- 

 ened, the fin without deep notch. Body deep; spines strong. A black bar on 



base, as well as on margin of dorsal fins ritteii. 



b 2 . Xeneretmus. — Cheek below suborbital crest with three plates. Two preoper- 

 cular spines developed. Pectorals with 13 rays, the 4 lower rays thickened 

 and produced, the membrane between ninth and tenth rays deeply notched, 

 the notch extending about halfway to base of ninth ray. Terminal rostral 



1 Xenopyxis Gilbert, new subgenus, type, Xeneretmus latifrons. 



