VOL. XV, 
Age PROCEEDINGS OF THE NATIONAL MUSEUM. 143 
MURAENIDA. 
Sidera mordax (Ayres). 
J. & G., 80, 30; R. Smith, 80; J. & G., 80a, 357; id. ’81, 36; id, ’82, 356. R. 
Smith, 785, July. 
— Not common. Very rare in the bay. 
I have not collected this species in tide pools. It seems to be com- 
~ mon on rocky places of the ocean beach. It was taken in the bay on 
_ May 1 and October 15, 1889. 
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BELONID. 
Tylosurus exilis (Girard). 
Girard, Proc, Acad. Nat. Sei., Philad., 1854, 149, and Pacific R. R. Survey X 158, 
1859; Giinther Cat. Fish vi, 238; J. & G., ’80, 30; R. Smith ’80; J. & G. 
’80a, 357; id. 81, 43; id., 82, 374; R. Smith, ’85, July. 
This species is very common in San Diego Bay during April and May, 
when it swims in schools on the surface. Schools are frequently seen 
flanking schools of Anchovies. Ripe or nearly ripe eggs were ob- 
tained in the middle of April, and in May they flow quite freely. (J. & 
G. give the spawning season as August.) I have not been able to arti- 
ficially fertilize the eggs nor have I found them developing naturally. 
The species is very rare in winter, I did not notice it later than Octo- 
ber. Jordan & Gilbert procured a specimen in January. 
On account of its “gfeen backbone” it is not used as food. The egg 
is large, amber colored, 2.4 mm. in diameter. The zona radiata is pro- 
vided with long tapering filaments set in basal sheaths. 
Scomberesox brevirostris Peters. 
R. E., Am. Nat. 1891, 59. 
One specimen of this species was procured for me by Mr. Medina during 
the summer of 1890. 
Hemirhamphus rose Jordan & Gilbert. Swordfish. 
J. & G. ’80, 29; id., Proc. U.S, Nat. Mus., III, 1880, 335; R. Smith, 80; J. & G., 
80a, 357; id., ’81, 43; id., 82, 376; E. Am. Nat., Feb. 791. 
This species is common in the bay throughout the year. Like its 
relative, Tylosurus exilis, it swims in schools of about a dozen on the 
surface during the early portion of the year and during summer. Dur- 
ing the latter part of summer and during fall it is not seen, living in 
deeper water. We have seen schools as early as January 17. 
It probably spawns early in the year. Young were procured with 
the surface net during April and May. 
Exoccetus californicus Cooper. 
R. Smith, ’80; J. & G., ‘80a, 357; id., 81, 42; id., 82, 379; R. Smith, ’85, July. 
E. & E., Notes from San Diego Biol. Lab, I, 4, 1889. 
This species is not uncommon off Point Loma and on the Cortes 
Banks during summer. It does not enter the bay and is not caught 
for the market. 
gute 
