1891.} Zoology. 153 
ZOOLOGY: 
New California Fishes.—PERKINSIA (genus nov.,) CLUPEIDÆ. 
Type: Perkinsia othonops:—Like Etrumeus, except that the pectoral and 
ventral fins are shielded, the scales of the breast adherent forming a 
ventral buckler, which covers the closed pectoral fins, leaving only the 
dorsal edge and the extreme tip of the fins visible. The closed ven- 
tral fins, likewise slip under a posterior buckler. The capillary scales 
are large, that of the pectoral extending very nearly to its tip, while 
the ventral axillary scale reaches slightly farther than its fin. Caudal 
deeply forked, the lateral scales extending continuously upon the cen- 
ter of the fin almost to margin of central rays. Adipose eyelid cover- 
ing the eye wholly, without a pupillary slit. 
Perkinsia othonops ; one specimen, 320 mm. long. The single speci- 
men known was caught November 2oth, 1890, off Point Loma, by fish- 
ermen taking mackerel. It belongs to the British Museum. 
Form of Clupea sagax, or of a mackerel with a stout tail. 
Head 4 (44); depth 5 (6); D. 17; A. 10; P. 15; V. 8. ; Scales 50. - 
Head compressed forward, eye longer than snout, 3 in head. Inter- 
orbital a little less than snout, 434 in head, the frontals narrowing for- 
ward. Occiput with ridges forming a W, the top of the head with a 
long, lanceolate depressed area anteriorly, with a median ridge, and a 
triangular area between anterior part of the W.. This region filled 
with adipose tissue in life. Maxillary 3 in head, not reaching the 
pupil, the supplemental bone very narrow, the maxillary sublinear, 
deeply ground. Cheeks opercle, preopercle, lateral portions of occi- 
put and an enlarged humeral scale with multifurcate mucous canals, 
which, especially upon the cheeks, form conspicuous dendritic markings, 
the canals being unpigmented against closely dotted interspaces. 
Isthmus triangular, the gill covers not emarginate below. Scales 
large, deciduous. Teeth as in Etrumeus. Pseudobranchia large, ex- 
posed. Gill rakers long and slender. Form of dorsal fin similar to 
that of Clupea sagax. The insertion of the fin equidistant between 
‘tip of snout and end of the anal.- Anal small. Caudal with minute 
scales. Ventrals entirely posterior to the dorsal fin, short, 334 in the 
head. Pectoral fins placed very low, 13 in head. 
Silvery below, steel-blue above, checks golden. Dorsal and caudal 
fins dusky. Ventral fins with a median blackisk blotch gnterion'y- 
~ Inner surface of pectoral fins chiefly black, the ends of the posterior 
