^^iVji" ] PKOCEEDIXGS OF THE NATK^XAL MUSEUM. 549 



Eye very small, slightly less than half snout, and one-twelfth leupth 

 of head. Snout 5i in head. Gill openings short, vertical, the length 

 of the slit but one-half of the broad isthmus. 



Vent much in advance ot the middle of the length, the body contained 

 1,^3 times in the tail. 



Dorsal fin beginning well forward on top of head, its origin equi- 

 distant between gill-slit and front of eye. Tip of tail sharp, free from 

 fins (or a distance etpialing length of snou^. I*ectoral developed as a 

 short deep membranous tlap as wide as gill-slit ; its length less than 

 half its width. Delicate rays are visible with the aid of a lens. 



12. Atheriuops insularuni sp. nov. 



Closely allied to Atherinops affinis, differing in the darker color, the 

 slenderer form, the much smaller scales, and the shorter spinous dorsal, 

 which is inserted farther forwards. 



The lateral line contains G2 to OS scales (52 to 50 in «//?«?.<») ; 5 scales 

 between upper edge of silvery baud and front of spinous dorsal (-4 in 

 affinis). 



Front of dorsal much nearer tip of snout than is front of anal, the dis- 

 tance between base of last dorsal spine and front of soft dorsal greater 

 than length of base of soft dorsal (much less than length of dorsal in 

 afjinis). Spinous dorsal constantly with 5 spines (0 or 7 in (ijfinis). 



Otherwise, in fins, dentition, and general proportions as in affinis. 

 As in affinis, the inner fork of teeth is occasionally shorter than the 

 outer, approaching the case of Atherinops regis, where this is the rule. 



Found very abundant at San Clemente and San Nicholas Islands of 

 the Santa Barbara Group, and farther south at Guadalu[)e Island. No 

 specimens of affinis were taken at these islands, nor were any of insu- 

 larian found on the shores of the mainland. 



13. Mugil setosus sp. nov. 



Closely resembling Mugil cnrema, from which it differs widely in its 

 much larger niulMserial set;ii, the longer narrower mouth, and the 

 deeply falcate lins. 



The mandibular angle is less than 90 degrees, and the length of the 

 cleft of the mouth but little (about one tenth) less than its width. The 

 premaxillary sette are in a narrow band, not arranged in definite cross- 

 lines as in CJuvnouiugil. Those of the outer row are very long and 

 nmnerous, curved aiul closely crowded; the inner setie are much shorter, 

 l>ut can be readily seen without a lens, and arc arranged in several 

 irregular series. The mandibular seta' are shorter and slenderer than 

 those on premaxillaries, but are larger than the |tremaxillary setic of 

 If. cnrema. They are in a single series, A narrow strip only of the 

 maxillary is visible in the closed mouth. 



Upper lip thick. Preorbital denticulated. Adipose eyelid partly 

 covering pupil, but much thinner than in cnrema and related species, 



