no. 2075. FISHES FROM SOUTHERN CALIFORNIA— GILBERT. 315 



the second, slightly behind vertical from sixth ventral pair, separated 

 from the middle spot by an interval equal to those separating those 

 of the ventral series. In 7 specimens, including the types of crenu- 

 laris and tenuis, the anteroanals vary from 10 to 11, the posteroanals 

 from 3 to 5. The posterolateral is above or a little behind the last 

 anteroanal, and but little below the lateral line. The last anal ray 

 is about opposite the first posteroanal. The single pair of precaudals 

 almost in contact below, placed immediately in advance of the 

 rudimentary rays of lower caudal lobe. 



Back brownish, rest of head and body silvery, the posterior margin 

 of each scale marked in adults by a curved series of short radiating 

 hair lines of black pigment. 



LAMPANYCTUS LEUCOPSARUM (Eigenmann). 



Apparently the most abundant deep pelagic species along the 

 California coast. Many specimens were secured, all of them typical 

 of leucopsarum, with no indication of an approach to the closely 

 allied L. nannochir. The latter species seems to be more northerly 

 in its distribution, the statement made by the present writer 1 to 

 the effect that L. nannochir had been taken in the Santa Barbara 

 Channel being an error. Both leucopsarum and nannochir are found 

 in Bering Sea, where nannochir is the most abundant, and both 

 extend southward as far as the northern part of California. But 

 in the southern part of California, south of San Francisco, only 

 leucopsarum has as yet been taken, and in this region it is remarkably 

 abundant. 



The general coloration is lighter than in nannochir, the middle of 

 sides always grayish silvery. The fins are translucent, or faintly 

 pigmented, the caudal alone having a broad blackish bar at base, 

 from which conspicuous dusky lobes extend into the basal portion 

 of the corresponding lobes of the caudal fin. The ventrals are 

 translucent, while in nannochir they are blackish, with a median 

 light area. 



Photophores always golden in color. In all specimens from the 

 present collection there are 4 precaudals, and in all but 3 specimens 

 the anals are 6 + 7 in number (the anterior group varying to 7, the 

 posterior to 6 or 8 in the 3 specimens mentioned). Ventral photo- 

 phores 4, supraanals 3 (4 in one specimen). The species is thus 

 more constant in the southern part of its range than it is farther 

 north, where the anteroanals are nearly evenly divided between 6 

 and 7, and the posteroanals between 7 and 8, where the ventrals 

 occasionally vary to 5 and the supraanals to 2 or 4. The tracts of 

 luminous scales on the upper and under sides of caudal peduncle 

 are constantly longer than in nannochir and the " scales" more 



1 Report U.S. Commissioner of Fisheries, 1896, p. 399. 



