1352 PROCEEDINGS OF THE ACADEMY OF [Nov., 



This interesting genus is the second known among the living repre- 

 sentatives of the family Albalidce. From Albula, with its single 

 alleged exotic species ranging through all tropical seas, it differs at 

 once in the last rays of both the dorsal and anal being produced in 

 long filaments, and its more slender head with a longer maxillary. 



Named for Samuel G. Dixon, M.D., LL.D., President of the Academy 

 of Natural Sciences of Philadelphia, in slight recognition of his appre- 

 ciation and encouragement of ichthyology. 

 Dixonina nemoptera sp. now 



Head 3£; depth 4f ; D. v, 16, i; A. m, 6, i; P. i, 16; V. i, 8; 76 

 scales in 1. 1. to caudal base (squamation injured); 9 scales obliquely 

 back from dorsal origin to 1. 1.; 7 scales obliquely forward from anal 

 origin to 1. 1.; 30 predorsal scales; head width 2'j in head length; head 

 depth at occiput ly^; snout 2f ; eye 5§; snout tip to maxillary end 

 2 T V; mandible 2f; interorbital 4i; first branched dorsal ray If; last 

 dorsal ray l T n „; first branched anal ray of; last anal ray 3J; least 

 depth of caudal peduncle 4^; pectoral 2; ventral 2f. 



Body fusiform, rather robust or thick, sides flattened, upper profile 

 apparently more convex than lower, deepest at dorsal origin, edges 

 all rounded. Caudal peduncle compressed, least depth about If its 

 length. 



Head moderately compressed, robust, surfaces above and below 

 rather depressed and but slightly convex, sides rather flattened and 

 not approximated below or above, profiles inclined similarly to form 

 attenuated contour. Snout long, ending in rather obtuse conic tip 

 width basally about H its length, depressed above posteriorly, sides 

 rather flattened and approximating slightly above. Eye moderate, 

 round, close to upper profile, slightly before center in head length. 

 Adipose eyelid thick, well expanded over entire orbital region, aperture 

 narrow, slit of which lower anterior edge forms flap over lower pos- 

 terior edge, which extends well forward. Mouth large, well infe- 

 rior, long snout protruding well forward beyond mandible tip, and 

 gape not quite opposite eye front. Lips thick, fleshy, firm. Max- 

 illary nearly back till opposite eye center, greater part 'concealed 

 below broad preorbital, and distal expansion about f of eye. Supple- 

 mental maxillary well expanded, its distal expansion little more than 

 distal maxillary width. Narrow bands of firm conic teeth in each 

 jaw, in upper only extending back along each premaxillary about 

 half its length, along mandibular edge extending much further back. 

 Vomer with crescentic patch of teeth similar and parallel to those in 

 upper jaw. Pterygoids, sphenoid and basibranchials with broad 



