ART. 13.— S. TANAKA : 



Gifiunoshnenchelyfif n. g. 



The new genus here established is very closely a,llit;d to 

 Simenchelys of Dr. Gill, but differs from it in having scaleless 

 skin. 



Gymnosimenchelys leptosomus, n. sp. 



PI. IL, fig. 2. 



Head 10 in total length, head and trunk 21 ; eye e5 in 

 head, snout about 4, interorbital width 4 to 3. 



Body elongate, eel-like, compressed ; head slightly compressed ; 

 eye lateral, high up ; interorbital broad, very gently convex ; 

 nostrils without tube ; posterior nostril above upper lip and 

 immediately in front of eye ; anterior nostril near tip of snout ; 

 snout broadly rounded in profile ; mouth terminal, its angle not 

 nearly reaching halfway between the tip of snout and the anterior 

 edge of eye. Jaws equal ; teeth also equal, small, bluntish, rather 

 close-set in several rows ; none on vomer and palatines. Gill- 

 openings inferior, horizontal, well separated from one another, 

 slit-like, extending backward and outward. Pectoral placed rather 

 low, small, with sharp tip, its length slightly longer than the 

 length of snout. Dorsal inserted a little behind tip of pectoral 

 and at a point slightly farther than half length of head behind 

 gill-opening. Vent placed about head length before middle of 

 total length. Caudal fin distinct, confluent with vertical fins. 

 No scale. Lateral line high, faint, concurrent with back. Pores 

 on anterior parts of head well developed ; a row of about G pores 



