172 U. S. p. R. E. KXP. AND SURVEYS — ZOOLOGY — GENERAL REPORT. 



pectorals. The base of the spinous portion is but a little shorter than that of the soft. The 

 membrane uniting the spines is less emarginated than in E. jacksoni. The articulated rays are 

 bifurcated but twice ; the extremities of the posterior rays extending a quarter of an inch more 

 backwards than the base of the anal. The rays of the caudal bifurcate four times ; the length 

 of the fin itself constituting the sixth of the total length. Tlie anal fin, the articulated rays of 

 which exhibit signs of a third bifurcation, is elongated^ undulating upon its external margin ; 

 its anterior spine is situated oi)posite the third articulated ray of the dorsal. A line dropped 

 vertically from the posterior extremity of the base of dorsal will intersect the base of the 

 twenty-third articulated ray of the anal. The insertion of the ventrals does not vary materially 

 from that in U. jacksoni when compared to the dorsal spines. The extero-anterior spiny ray, 

 however, is proportionally longer. The articulated rays subdivide thrice. The base of the 

 pectorals is greater than in the latter species ; their tip extends backwards to a vertical line 

 drawn at the anterior articulated ray of the dorsal ; the rays subdivide twice. 

 The formula of the fins is as follow : 



Male : Br. VI : VI ; D X, 20 ; A III, 10 + 16 = 26 ; C 3, 1, 6, 6, 1, 2 ; V I, 5 ; P 20. 

 The general aspect of the scales, as well as the number of longitudinal rows, is nearly the 

 same as in E. Jacksoni, being, however, smaller on the sub-thoracic region. The dorsal furrow 

 originates likewise under the first articulated ray of the dorsal fin, extending to the sixteenth. 

 The sheath above it is composed anteriorly of two rows of scales, and posteriorly of one row 

 only. The anterior radiating furrows of the scales themselves are more numerous than in 

 E. jacksoni and E. ivebbi. 



The ground color of the head and body is purplish brown ; the latter exhibiting about a 

 dozen vertical bands of a deeper hue, extending almost to the inferior outline of the abdomen. 

 The pectoral fins are olivaceous ; the other fins being of a deep purple. A light olivaceous 

 streak may be observed along the base of the soft dorsal. 



In specimens which have not completed their growth, the ground color is of a light olivaceous 

 tint ; the transverse bands being dusky. 



The species appears to be quite common in the bay of San Diego, California, where the 

 specimen figured has been obtained. 



Six specimens, of an average size of two inches and a half, were received from the same 

 locality. These we consider as being the young, and accordingly have caused the outline of one 

 of them to be represented on Plate XXVI, fig. ] 2. It is upon this specimen that the species was 

 first established. It bears a very great resemblance to the young of Emhiotoca ornata, figured 

 on the same plate (fig. 11). We observe the same shape of the caudal fin, the same prolon- 

 gation of the posterior articulated rays of both the dorsal and the anal fins. The most 

 prominent difference will be found in the length of the anal. The ground color is greenish 

 yellow -with transverse greyish bands. The fins are all light yellow or straw color ; in one 

 specimen we noticed the tip of ventrals and anterior portion of anal assuming a darker hue. 



It is worthy of remark, that while these young were caught in open waters, they are 

 smaller than those of Emhiotoca ornala, taken within the body of the mother. This must be 

 explained by the fact that the parent from which they issued differed very materially in bulk. 

 Plate XXIX, fig. 1, represents a male individal of Emhiotoca cassidii, size of life. 

 Fig. 2 is a section across the line of greatest depth of the body4 



