NATURAL SCIENCES OF PHILADELPHIA. 327 



fin ; the ventral is also posterior to the pectoral, and is slightly anterior to 

 the first ray of dorsal. The origin of the second dorsal is situated slightly 

 posteriorly to the vent, and directly opposite the origin of the anal ; the ter- 

 minal ray of the anal is anterior to the terminal "ray of second dorsal. The 

 caudal fin is slightly rounded. 



5 



The numbers of the fin rays, are D ; 1112. C, 16 - A, 9. V, 6. P, 11. 



5 



Total length. 2 inches. 



Color. In alcoholic specimens, the general tint of the body is sienna, fading 

 into pale straw color upon the belly ; throat orange ; pectoral and ventral fins 

 orange ; the other fins partake of the color of the region to which they belong. 

 Fourteen bands of dark rufous, joined upon the back, cross the sides trans- 

 versely, and become obliterated upon the belly ; the intervening spaces are 

 double the width of the bands. 



Habitat. Cabinet of Academy ? Lake Snperior. 



A few specimens of this fish, with specimens also of a new species of 

 Pileoma DeKay, were presented by W. A. Hammond, M. D., to the Acad- 

 emy ; but the locality and date of presentation have been lost, and no 

 mention of the fish being presented is made in the '-Proceedings." The 

 only other described representative of this g*'nus is the P. zebra Agassi:, 

 described in his work on Lake Superior, as a fish of those waters. This new 

 species may be from the same locality, but at present there is no means of 

 positively ascertaining. 



4. Pileoma cymatogramma Abbott. Body cylindrical, slightly de- 

 pressed. Head small, facial outline oblique ; mouth rather large. The eye 

 is situated near the top of the head, with the diameter of the orbit equal to one- 

 third of the length of the head. The operculum terminates posteriorly in a 

 broad flat point ; the preopercle terminates posteriorly in a small, very acute 

 and conical spine. The lateral line is nearly straight throughout -its course. 

 The insertion of the pectoral fin is anterior to that of the ventral, and that of 

 the ventral anterior to the origin of dorsal. The origin of the second dorsal 

 is opposite the primary ray of the anal fin. The caudal is slightly bifurca- 

 ted. 



4 



The numbers of the fin rays are D, 1312. C. 16 - P, 13. V, 7. A, 8. 



4 



Color. In alcohol specimens, the general color of the upper surface, light 

 rufous, fading on the belly. A broad, wavy band, mostly below the lateral 

 line, of dark rufous-brown. Numerous quadrangular, dark rufous spots on 

 the back and sides above the lateral line. 



Habitat. Cabinet of the Academy. 



This genus differs principally from Poecilosoma, in having the cheeks and 

 opercular apparatus, both scaly. 



5. Ammoccetes aep y ptera Abbott. Body posterior to second branchial 

 aperture, compressed and tapering rapidly towards the tail ; belly, anterior 

 to the vent, flattened. The first dorsal fin arises somewhat posteriorly to the 

 centre of the entire length of the body, and is pyramuial in figure. The 

 second dorsal fin, joining with the caudal, is smaller than the first dorsal and 

 more acutely pyramidal in its figure. The caudal, whose origin is situated 

 opposite the vent, is higher than either dorsal fin, and decreases rapidly 

 towards the tail. Nape of the neck nmch elevated, and the facial outline 

 obliquely descending. Snout exceedingly prolonged ; mouth circular ; on the 

 inside of the upper lip there are three or four very small granules on each 

 side ; and at the opening of the throat small ramified papillae. The eyes are 

 very small and situated near the top of the head, equidistant between the 

 first branchial aperture and the angle of the mouth. The branchial apertures 



I860.] 



