4 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 9I 



3a. Teeth very short, the patches almost pavementHke in appearance ; 

 vomerine patch of teeth widened posteriorly, covering much of roof 

 of fore part of mouth, and confluent vi^ith the premaxillary patch ; 



top of snout swollen Promyllantor Alcock. 



3b. Teeth longer, the patches never with the appearance of being pave- 

 mentlike, vomerine patch never widened but always narrowed pos- 

 teriorly and distinctly separated from the premaxillary patch ; top 

 of snout little or not at all swollen. 

 4a. Snout considerably projecting, all of the premaxillary teeth visible 

 from directly below with mouth tightly closed; dentition normal, 

 the teeth not greatly enlarged; color not blackish. 



Congrina Jordan and Hubbs. 



4b. Snout scarcely longer than lower jaw, nearly all the premaxillary 



teeth hidden when viewed from directly below with mouth closed ; 



dentition very strong, teeth of premaxillary, front of vomer, and 



front of lower jaw greatly enlarged canines ; blackish eels from 



deep water Baihyuroconger Fowler. 



2b. Teeth of vomer extending backward in a single series to below middle of 

 eye ; bony casing of facial canal sending 2 or 3 long slender processes far 

 backward and downward to support the very extensible upper lip. 



Uroconger Kaup. 



ARIOSOMA Swainson 

 ARIOSOMA SELENOPS, n, sp. 



Text-fig. I 



Holotype.- — U.S.N.M. no. 93310 (Field no. 653), 475 mm standard 

 length; Caroline station loi, due north of Tobago Island, latitude 

 i8°4o'3o" N., longitude 64°5o'oo" W., to latitude i8°45'4o" N., longi- 

 tude 64°48'oo" W., March 4, 1933, otter trawl, 190 to 300 fathoms. 



Paratypes. — U.S.N.M. nos. 93311-93312 (Field nos. 638-639), two 

 specimens, 343 to 414 mm standard length ; from Caroline station 

 100, due north of Tobago Island, latitude i8°38'45" N., longitude 

 64°52'45" W., to latitude i8°4o'i5" N., longitude 64°5o'i5" W., 

 March 4, 1933, otter trawl, 100 to 300 fathoms. 



Body elongate, scaleless, the caudal portion compressed posteriorly. 

 Head 5.9 in total length; snout to vent 2.3; tail 1.6; tip of snout to 

 dorsal origin 6.1; isthmus to vent 3.9. Snout 5 in head; maxillary 

 3.7; mandible 4; pectoral fin 2.8; longitudinal diameter of orbit 

 (including adipose membrane) 5.2 ; vertical diameter 8, equal to inter- 

 orbital ; depth of head at end of second third 2.7 ; body at vent 3.2. 

 Width of isthmus unusually narrow, 13.3 in length of head or about 

 equal to base of pectoral. Width of head at end of second third 

 3.4; body at vent 4.6. Teeth small, sharp, conical, in bands on the 

 jaws. Premaxillary and vomerine groups not separated by an inter- 

 space but forming a continuous patch anteriorly, extending back on 



