104 ICHTHYOLOGIA OHIENSIS 



43d Species. Bigback Chubby. Semotilus dorsalis. 

 Semotile dorsal.' 



Diameter one fifth of total length: silvery, back 

 olivaceous with some black dots, and raised; head 

 brown above, a crenulated keel above each eye : lat- 

 eral line upwards at the base: tail brown, with a 

 black spot at the base and another before it. Dorsal 

 fin with 8 rays and a large brown spot at the anterior 

 base. Anal fin with 9 rays. 



It is found in the Kentucky, and several other riv- 

 ers. Vulgar names, Big-back Minny or Chub, Skim- 

 back, &c. Length from three to six inches. Iris 

 gilt brown. Fins olivaceous, pectoral fins with 12 

 rays, trapezoidal not reaching the abdominal. Tail 

 with 24 rays, end pale, base with a round black dot, 

 and a smaller one before it on the body, when the 

 lateral line terminates. Head separated from the 

 back by a suture connected with the opercule, back 

 large convex higher. 



44th Species. Bighead Chubby. Senotilus cepha- 

 lus. Senotile cephale. 



Diameter one fifth of the total length: silvery, 

 back brownish, lateral line raised upwards at the 

 base; fins fulvous, the pecto- [50] ral reddish, the 

 caudal pale at the end and unspotted, the dorsal with 

 nine rays and a large black spot at the anterior base, 

 anal with nine rays. 



Length from six to eight inches, not uncommon 

 in the creeks of Kentucky, &c. Vulgar names Chub, 

 Big-mouth, and Big-head. It has really the largest 

 head and mouth of this tribe. Iris redish iridescent. 

 Pectoral fins with 15 rays trapezoidal and short, 

 abdominal fins rounded, dorsal fin beginning over 

 them, spot round. Tail with 20 rays. 



