FISH. 135 
the opercle, and lower down on this last piece some very deep strie, running parallel to its 
junction with the preopercle, as in the Pilchard, but still more strongly marked. 
The commencement of the dorsal is very little anterior to a middle point between the end 
of the snout and the base of the middle caudal rays. The ventrals are beneath the posterior 
half of the dorsal as in the Pilchard. There are the same two elongated scales on each side of 
the caudal as in that species. The scales on the body, however, are much smaller than in the 
Pilchard, with their free portions striated, the basal portions marked with some irregular 
curved lines running in a transverse direction towards the median line of the scale. 
D.11; A. 18o0r 19; C. 19, &.; P. 18; V. 8. 
Length 10 inches 6 lines, 
Habitat, Lima, San Lorenzo Island. 
ALOSA PECTINATA. Jen. 
Puate. XXV. 
A. corpore ovali, altitudine prope tertiam partem longitudinis equante : ventre cari- 
nato, serraturis, presertim inter pinnas ventrales et analem, acutis: mazillis sube@- 
qualibus, edentulis : preoperculo venoso ; operculo striato : squamts pectinatis : pinnis 
ventralibus paulo ante dorsalem exorientibus. 
DALG' Ay 2netCs 19 wes, P27 V7. 
Lone. unc. 12. 
Form.—Of an oval compressed form, the depth very considerable, equalling very nearly one-third 
of the entire length. Head contained about three times and three quarters in the same, 
Abdomen sharply carinated, with strong serratures, especially between the ventrals and anal. 
Jaws nearly equal, perhaps the lower one a little the longest; intermaxillary deeply notched ; 
no apparent teeth anywhere. Eyes rather high, partly covered both anteriorly and posteriorly 
by a membranaceous veil; their diameter about one-fifth the length of the head; more than 
one diameter between them and the end of the snout. Subopercle obliquely rounded off at 
bottom, but the curvature of the posterior margin of the opercle and subopercle taken together 
not very considerable. Preopercle marked with vein-like ramifications; opercle similarly 
veined, and also striated below, as in the species last described, though more finely. Scarce 
any trace of a lateral line. 
Scales moderately large, thin and membranaceous. One from the middle of the side of 
a sub-oblong form, the hinder angles rounded, its length only two-thirds of its breadth; the 
greater portion of the surface marked with exceedingly delicate stria, scarcely visible without 
a strong lens, the anterior margin pectinated, and with a slightly projecting lobe in the 
middle. The scales as they approach the tail, become longer in proportion to their breadth, 
the basal margin more rounded, and sometimes with a strongly projecting lobe in the middle. 
The pectinations are longest on the scales covering the nape. 
The dorsal commences a little behind the middle point of the oval of the body, and the 
ventrals are attached a little in advance of that fin. The anal commences a little behind the 
termination of the dorsal, and reaches to the commencement of the fleshy part of the tail: the 
last ray in both dorsal and anal is slightly lengthened beyond the preceding ones. The pec- 
