1920.] NATURAL SCIENCES OF PHILADELPHIA. 129 



with no osseous ray or spine; anal short, with 8 branched rays, 

 entirely behind the dorsal; root of the ventral covered by tiled 

 scaly sheath. Scales large, imbricated. Lateral line continuous, 

 slightly decurved, running along the middle of the tail. Type 

 Leucisculus fuscus Oshima. 



Very closely related to Leuciscus, differing from it in having single- 

 rowed, molar-like teeth. 



29. Leucisculus fuscxis new species. Plate V, figure 1. 



Head 3.46 in length; depth 3.40; D. 3.7; A. 3.8; P. 19, V. 9, 

 width of head 1.57 in its length; interorbital space 2.43 in head; 

 snout 3.38; eye 5.50; pectoral 1.38; ventral 1.49; 43 scales in the 

 lateral line, 7 scales in an obliciue series from origin of dorsal to lat- 

 eral line. 7 scales between the latter and the middle of belly; 4 

 scales between lateral line and the root of ventral; pharyngeal teeth 

 5-4; gill-rakers minute. Body robust, elongate, more or less com- 

 pressed posteriorly; deepest in front of the dorsal; dorsal outline 

 much more curved than that of the ventral; head triangular, strongly 

 depressed, its dorsal outline straight, inclined; interorbital space 

 broad, nearly flat; postoperculum radially striped; snout short," 

 sharply pointed anteriorly; mouth terminal, oblique, maxillary 

 reaching a vertical through posterior border of the anterior nostril; 

 upper jaw slightly longer than the lower; upper lip entire, rather 

 thin, lower lips discontinuous, postlabial folds distinctly separated 

 in front; tip of the lower jaw naked, trenchant; barbels none; eye 

 large, anterior; nostrils large, close together, on the upper surface 

 of the snout, anterior nostril in a short tube, the posterior covered 

 by a large flap; pharyngeal teeth in a single series, molar-like, very 

 large, with smooth, oval grinding surface; gill-rakers minute, rudi- 

 mentary; gill-openings large; gill-membranes connected below the 

 postoperculum. Origin of the dorsal a little nearer to the tip of 

 snout than base of caudal, rather short, high, first branched ray the 

 longest, when depressed reaching to the origin of anal, outer margin 

 rounded; origin of anal midway between origin of ventral and the 

 root of caudal, rather short, anterior branched ray the longest, when 

 depressed scarcely reaching the root of the caudal; pectoral large, 

 not reaching the root of ventral; ventral inserted below the second 

 divided ray of the dorsal, scarcely reaching the vent; caudal ped- 

 uncle short, slightly compressed, its depth 2.16 in head; caudal fin 

 broad, forked, its lobes obtusely pointed. Scales large, cycloid, 

 imbricated; pectoral and ventral with a short scaly flap; lateral 



