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Show FISII. 135 the opcrcle, and lower down on this last piece some very deep strire, runnin"' 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. 18or 19; C. 19, &c.; P. 18; V. 8. Length 10 inches 6 lines. Habitat, Lima, San Lorenzo Island. ALOSA PECTINATA. Jen. PLATE. XXV. A. corpore ovali, altitudine pt·ope tertiam partem Zongitudinis cequante: ventre cm·inato, serraturis, prCEsertim inter pinnas ventrales et analem, acutis: maxillis subcequalibus, edentulis: preoperculo venoso; operculo striato: squmnis pectinatis: pinnis ventralibus paulo ante dorsalem exorientihus. D. 16; A. 21; C. 19, &c. i P. 17; V. 7. LoNG. unc. 12. FonM.-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 scrratures, especially between the ventrals and anal. Jaws neal"ly 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 bead; 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 strire, 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 tho 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 pee- |