1910.] NATURAL SCIENCES OF PHILADELPHIA. 607 



Winchell may be a synonym. Lepisosteus platyrhynchus DeK. has 

 much fewer scales, and C. rafinesquii Dum. is said to have eye 2 to 

 opercle. 



Cylindrosteus scabriceps sp. nov. PI. XXXVIII, figs. 8, 9. 



Head 3£; depth 2| in head; D. 8, 1, fulcra 5; A. 8, i, fulcra 6; P. 11, 

 fulcra 1; V. 6, fulcra 3; scales 63 in 1. 1. to caudal base; predorsal 

 scales about 53; scales around trunk middle 47; snout If in head; 

 mandible If; interorbital 6^-; dorsal length 2\; anal 2\; caudal, 

 from base medianly of upper lobe If; pectoral 3£; ventral 2f ; snout 

 width at rictus 6J; eye If to opercle. 



Body elongate, well compressed, predorsal region stoutest in width 

 anteriorly, and greatest depth at ventral base. Caudal peduncle 

 well compressed, least depth about 2\ its total length. 



Head well depressed, wider than deep, upper profile concave, 

 especially just before eye, lower profile straight, and flattened sides 

 slightly convergent below. Snout well depressed, arising in gentle 

 median slope behind, and width at tip trifle less than half of basal 

 width. Eye trifle elliptical, placed at last third in head length, and 

 If in least interorbital width. Mouth not completely capable of 

 closing, and mandible tip included well within snout tip. Series of 

 minute sharp conic teeth along each edge of jaw externally of more 

 or less unequal size. Just within small teeth a single series of en- 

 larged slender conic teeth, in front of jaw these much larger and others 

 gradually decreasing in size towards rictus, where very little larger 

 than small external teeth. These long teeth uniformly larger in lower 

 jaw, and when jaws close alternate so that their tips fit in sockets 

 in opposite jaw. Front of upper jaw with 3 enlarged canines in trans- 

 verse series, and mandible with 2 at end of each ramus. Osseus 

 palatine ridge externally with an elongated narrow asperous area, and 

 along its inner edge a series of small pointed teeth, much larger than 

 asperities, and anterior ones largest, others graduated down pos- 

 teriorly so as scarcely distinguishable toward rictus. An inner elon- 

 gated area of palatine asperities, becoming wider posteriorly. A 

 narrow median area of vomerine asperities. Along each edge of 

 mandible internally narrow area of minute asperities. Tongue 

 broadly expanded, free, deeply notched in front and upper surface 

 well asperous. Nostrils 2 small pores, superior, near snout tip, 

 distance between anterior and posterior little greater than internasal. 

 Interorbital rather broadly depressed, only slightly convex. Opercle 

 nearly deep as long, and lower edge deeply inclined down convexly 



