tas ‘FISHES OF SAN DIEGO—EIGENMANN. 
pelagic species like the albicore and in that of the bottom fishes like 
the species of Sebastodes. ; 
Specimens of this species are even more numerous in the summer in 
the bay than Clupea sagax in winter. They swim in large schools and 
frequently when frightened by large fishes below them or for other 
reasons the heads of a whole school of them will be thrust out of water. 
The pelicans at this time dive in among them and catch large numbers. 
Schools of Tylosurus exilis flank them and by sudden darts catch many. 
They are thus beset on all sides by enemies. They feed on crustacea 
and larval fishes. 
I have not definitely decided which of the oval eggs belong to this 
species and which to delicatissmus. 
Stolephorus delicatissimus (Girard). (Plate XII. ) 
Girard, Proc. Acad, Nat. Sci. Philad. vir, 1854, 154 and Pacific R. R. Survey x, 
325, 1859; J. and G. ’80, 30; R. Smith ’80, J. and G. ’80a, 457; id. 781, 38; id. 
782, 276; R. Smith, ’85, July; E. and E. Contrib. San Diego Biol. Lab., I, 
West Aa Scient., June, 1889. 
This species is very abundant in San Diego Bay. I have not deter- 
mined whether it remains throughout the year or not. It certainly is 
very common during summer or from March to September. Jordan and 
Gilbert have found it abundant here in January. 
DEVELOPMENT OF STOLEPHORUS DELICATISSIMUS AND RINGENS. 
(Plate x11.) 
The eggs of these two species differ from most other pelagic eggs in 
their elongate shape. The eggs are transparent. The yolk is totally 
segmented. The eggs vary greatly in size and shape, and at first I sup- 
posed them to be three distinct species. The measurements are 0.81 by 
0.57 millimeters, 0.89 by 0.49, and 0.70 by 0.50. Oval eggs which may 
be referred to this genus have been described by M. Kowalewski,* 
Wenckebach,t and Raffaele t (who correctly identifies them), Agassiz 
& Whitman § have described a species of Stolephorus as an Osmerus. 
The eggs of Osmerus are provided with a peculiar double zona, the 
outer layer of which is reflexed at the time of spawning, and remains 
attached to the inner part around the micropyle. 
These are the most abundant of the pelagic eggs found at San Diego. 
During their season a number could be uae cured at any time by throw- 
* Ueber iS ersten Bahwacketun cme Bee Knochenfische. Zeitschr, f. Wis- 
senseh, Zool., 1883. 
tBeitriige zur Entwickelingsgeschichte der Knochenfische. Arch. Milkr. Anat. 
XXVIII, 1886. 
{Le nova galleggianti ele larve dei Teleostei nel golfo di Napoli. Mitth. Zodi. Stat. 
Neaple, vu, 1888. 
§ The Development of Osseus Fishes, I. Mem. Mus. Comp. Zool. 1885. 
