1854.J 153 



the origin of anal backwards. The greatest depth measured under the anterior 

 dorsal, is contained a little more than thrice and a half in the total length. The 

 head forms a little less than the fourth of the whole length. The cephalic 

 region is concave. Mouth rather above the medium size, its cleft being ob- 

 liquely directed upwards; the teeth are very exiguous ; the posterior extremity 

 of upper maxillary does not extend beyond the vertical line of the anterior rim 

 of orbit, owing to the oblique position of mouth. The eye is very large and cir- 

 cular ; its diameter being contained less than three times in the length of side of 

 the head. The anal is very Ions and low posteriorly. The caudal is forked. 

 The origin of ventrals is under the second spine of the anterior dorsal. 



D IX. 27. A III. 32. C 4. 1. 6. 6. 1. 3. VI. 5. P 1-2G. 



The scales are of medium size, and on the middle of flanks they are higner 

 than long, and subrounded. 



Dorsal region and head above, ash colored or greyish brown ; dorsal and cau- 

 dal greyish. Sides of abdomen and belly dull yellow or white, with a silvery 

 reflection. Pectorals yellowish. Base of ventrals yellowish ; tip blackish or 

 deep purple. Anal yellowish at base with tips of rays greyish, and a d.tfused 

 spot upon its anterior third. 



From Presidio, Cal. 



'> 



Genus PHANERODON, Girard. 



Mouth rather small ; jaws very protractile; teeth large and subcorneal. Lips 

 not very fleshy ; lower one attached to the symphysis of the jaw. Anterior 

 part of dorsal fin gradually rising from the first to the last spine, which, however, 

 is a little shorter than the first articulated ray. Anal very low but quite long, 

 furnished with bifurcated rays. 



This genus is allied to Emhiotoca by the presence of one row of teeth only upon 

 both the upper and lower jaws, and by the lower lip in not being free all around. 

 The structure of the dorsal reminds us of Amphistlchus, whilst the shape of the 

 anal is strongly suggestive of Holconotus. 



31. Phankrodox furcatus, G. Body very flat, seven inches in total length, 

 tapering more or less rapidly backwards from the origin of both the soft dorsal 

 an, I anal. The greatest depth of body, measured above the insertion of ventrals, 

 is contained a little less than three times in the total length, in which the head 

 enters about four times and a half. The cleft of the mouth does not extend to 

 the anterior rim of the orbit. The eye is large and circular, and its diameter 

 comprised three times and a half in the length of side of the head. The inser- 

 tion of ventrals is opposite the fourth dorsal spine. The base of anal is nearly 

 equal to that of soft dorsal and lower than the latter, its spiny rays are very 

 small. The caudal is slender and deeply forked. 



D X. 23. A 111. 33. C 4. 1. 6. G. 1. 3. V I. 5. P 1-19. 



The scales ate large and provided anteriorly with numerous grooves. 



Color yellowish brown above, lighter on the sides; whitish under the throat. 

 Fins yellowish. Margin of dorsal and caudal greyish. A diffused marginal spot 

 upon the anterior portion of anal. 



From Presidio, Cal. 



3-1. Ampuistjcutjs argenteus, Agass. Amer. Jour, of Sc. Second series, xvii. 

 1S>1, p. 3(57. 



From Presidio, Cal. 



CYPRIXID.E. 



36. Posohickthys ARGVUErosus, G. This species is allied to P. ivceqnilohus; 

 it is, however, distinct from the latter by the structure of the caudal which is 

 equilobed like that of P. symmetricus* The head is contained five times in the 

 rotal length, which, in the specimen before us, is about three inches and three 

 quarters. The eye is large, subelliptical, and its horizontal diameter contained a 

 little over three times in the length of the side of head. The budy is compress- 

 ed, regularly fusiform in its outline. The insertion of ventrals is situated some- 



