IN THE ALLEGHENY REGION OF SOUTH-WESTERN VIRGINIA. 235 



specimens, the third ray much longer than the second and first articulated. Radii 

 D. i. 8. C. +18+. A. i. 7. V. i. 8. P. 15. 



Total length 3 in. 9 lin. ; from end of muzzle to origin of dorsal 1 in. 7 lin. ; from 

 do. to origin of caudal To. 



General color above and on the sides slate-blue ; top of head and end of muzzle Avith 

 lips leaden-black. Dorsal and caudal fins black, the former pale at base and margin. 

 Anal with a posterior black spot. 



Although the physiognomy of this species is marked, its distinguishing characters 

 above given, as compared with the variable Ii. n o t a t u s , are not many. Tlie 

 cranium is much more rugose in adults, and the form of the dorsal fin peculiar ; the 

 latter is quite similar to that of H. n o t at u s in younger specimens. 



This fish occurs rather rarely in the tributaries of the Kanawha River, where the 

 latter passes the highest ranges of the AUeghenies. 



Hyboehynchus notatus (Raf,) Agass. 

 Abundant in muddy portions of all the tributaries of the Kanawha. 



CAMPOSTOMA Agassiz. 

 Camposto.ma akojialum (Raf.) Agass. 



This species abounds in tlie tributaries of the Roanoke, Kanawha, and Ilolston. 

 All present the dentition given by Agassiz, 1-4 — 4-0; occasionally the outer tooth is 

 present on the right side also. The G. duhlum does not differ otherwise, and the G. 

 calUpteri/x must be regarded as synonymous, being founded on a male of shortened 

 form and elevated front; some similar specimens occur from Sinking Creek. Speci- 

 mens vary in having the head enter the length from 4-5 to 5 times. The species of 

 the genus are then four, viz.: C. ano malum Raf, C. mormyrus Cope, C. 

 g b i o n i n u m Cope, and C. h i p p o p s Cope. 



TERETULUS Rafin., Cope emend. 



Ptijchostomus Agass., Amer. Journ. Sci. Arts, xix, 88. 



The essential character of this genus is the division of the natatory bladder into 

 three chambers, while Catostomus, and all Cyprinidte, exhibit but two. This feature 

 is accompanied by plicate lips, as Agassiz has indicated, and nine radii to the ventral 

 fin, already pointed out by Rafinesque. The species are the largest scaled of the 

 typical suckers. Le.seur and Valenciennes have pointed out the generic features in 

 the P. macrolepidotus ; Prof Baird informs me that it occurs in Pl.florealis Bd., and 

 I find it in Pt. cervlaus and Pt. duquesnei. It no doubt exists also in the Pi. aureolus. 

 Other species described by Baird and Girard from the south-west probably possess it. 



GO 



