FISHES — EMBIOTOCOIDAE — EMBIOTOCA CASSIDII. 



171 



Fig. 3, a scale from the dorsal region. 



Fig. 4, a scale from the lateral line. 



Fig. 5, a scale from the abdominal region. 



Plate XXVIII, fig. 1, is the female sex, likewise reduced. 



Fig. 2, a section across the line of greatest depth. 



Figs. 3, 4, and 5, scales from the back, lateral line, and abdomen, magnified as usual. 



Plate XXVI, fig. 3, represents the young, size of life, as taken in the ovary of the female 

 above represented. 



Fig. 4, is the same embryo enlarged three times, in order to render its features more con- 

 spicuous and tangible. 



List of specimens. 



2. EMBIOTOCA CASSIDII, Grd. 

 Plate XXIX and Plate XXVI, Fig. 12. 



Spec Char. — General form sub-ellipsoid. Frontal region very slightly depressed above the eyes. Anal undulated upon its 

 external margin ; its origin being opposite the third articulated ray of the dorsal. Tip of pectorals reaching a vertical line that 

 would intersect the base of last spiny ray of dorsal. Eyes above the medium size. Posterior extremity of maxillary not reaching 

 the vertical of the anterior rim of orbit. Branchiostegals six in number. Fifty-seven scales in the lateral line. Purplish brovrn, 

 with about twelve transverse bands of a deeper tint. 



SrK.—Embiotoca cassidyi, Grd. in Proc. Acad. Nat. Sc. Philad. VII, .1854, 151 ; and, VII, 1855,320. 



Adult specimens of this species having come under our examination since its first publication, 

 any doubts which might have been entertained in regard to its characters are thus entirely 

 removed. It is always a more or less critical responsibility to establish species upon immature 

 specimens, and we are glad of the opportunity thus afi"orded us to draw up a more complete 

 description than the one previously published. 



The general appearance of this species is more contracted, more elliptical than in E. jacksoni, 

 yet the proportions between the head and the body are nearly the same. The profile, however, 

 is sloping more rapidly forwards. The posterior margin of the opercular apparatus forms a 

 more convex or else a more complete curve, which, when added to an eye proportionally larger, 

 gives to it a physiognomy altogether peculiar. The horizontal diameter of the eye is comprised 

 nearly four times in the length of the side of the head, and exactly once anteriorly to the orbit. 

 The posterior extremity of the maxillary does not extend quite to the vertical of the anterior 

 rim of the orbit. There are six branchiostegal rays on either side, of a moderate development. 



The origin of the dorsal fin is nearly opposite to the anterior extremity of the base of the 



