538 



FISHES. 



composed of several rays. Upper jaw overlapping the lower. 

 Conical teetli in the jaws, on the vomer, and on the palatine 

 bones. Barbel none. Five or six branchiostegals ; gill-opening 

 narrow, the gill-membranes being attached to the isthmus. 

 Pseudobranchise present. Air-l)ladder none. Pyloric appen- 

 dages two, or rudimentary, or entirely absent. No prominent 

 anal papilla. 



Fig. 246. — Lycodes mucosus, from Northumberland Souud. 



Nine species are known from the Arctic Ocean, four from 

 the southern extremity of the American continent. 



Gymnelis. — Body elongate, naked. Eye of moderate size 

 or rather small. Ventrals none. Vent situated at some dis- 

 tance backwards from the head. >Small conical teeth in the jaws, 

 on the vomer and palatine bones. Jaws equal anteriorly. 

 Barbel none. Six branchiostegals ; gill-opening narrow, the 

 gill membranes being attached to the isthmus. Pseudobranchise 

 present ; air-bladder none. Pyloric appendages two ; no pro- 

 minent anal papilla. 



Fig. 247. — Gj'mnelis viiidis. 



One species {G. viridis) from Greenland, the other (G. 

 pictus) from the Straits of Magelhcen. 



The other genera belonging to this family are Uroncdes 

 from Baffin's Bay, Microdcsmits from Panama, Blcnnodesmus 

 from the coast of North- Eastern Australia, and Mayiiea from 

 the Straits of Ma^elhsen. 



