GENUS CHASMISTES. 149 



The type is a fine specimen, 10J inches long, collected by Professor G. 

 Brown Goode in the Saint John's River, Florida. It is numbered 19071 

 on the Museum Eegister. I have named the species for my friend, Pro- 

 fessor Goode, one of the best of American ichthyologists, to whom we 

 are indebted for the discovery of the species. 



Specimens in United States National Museum. 



Genus CHASMISTES Jordan. 



Chasmistes JORDAN, Bull. Hayden Geol. Surv. Terr. 417, 1878. 

 Type, Catostomus fecundus Cope & Yarrow. 

 Etymology, ^ao/iaw, to yawn or gape. 



Fishes related to Catostomits, having the teeth, scales, and air- 

 bladder as in that genus, but distinguished by the size and position 

 of the mouth, the great development of the mandible, and by the small, 

 smooth lips. 



Head disproportionally large, forming more than one-fourth of the 

 length, broad and flattish above ; sides of head vertical, slightly directed 

 inwards, the breadth through the cheeks less than, the breadth above the 

 eyes ; eyes small, high up, rather posterior : mouth exceedingly large, 

 terminal, the lower jaw in the closed mouth being very oblique, placed 

 at an angle of about 45 degrees ; the lower jaw very long and strong, 

 its length more than one-third the length of the head, nearly half the 

 length of the head in the adult, its tip when the mouth is closed about 

 on a level with the eye ; upper jaw very protractile ; upper lip very 

 thin (for a Sucker), and nearly smooth ; snout elevated above the rest 

 of the head, notably so when the mouth is closed ; lower lip moderate, 

 consisting of a broad flap on each side of the mandible, in front reduced 

 to a narrow rim, the surface of the lip nearly smooth, without evident 

 papillae : nostrils large ; suborbital bones narrow, but rather broader 

 than in Catostomus ; preorbital unusually large : mucous channels mod- 

 erately developed ; fontanelfe very large ; isthmus rather narrow : 

 pharyngeal bones and teeth essentially as in Catostomus. 



Body rather slender, tapering pretty regularly from the shoulders to 

 the tail, but little compressed : caudal peduncle rather stout. 



