60 ' PROCEEDINGS OF THE ACADEMY OF [Feb., 



but slightly compressed. Head rather small. E\'e rather large. 

 Mouth moderate. Dark lateral streaks. 



This subgenus differs from the others (Moxostoma and Teretulus) 

 in the much fewer dorsal rays and coloration. The single species 

 lives in swift and rapid streams, about rock pools, in the southern 

 Alleghanies. 



(IxdfjTTj'g, jumper; /j.u^duj^ to suck; as the typical species is known 

 as "Jumping Mullet.") 



Mozostoma cervinum (Cope). 



Plychosiomus cervinus Cope, Journ. Acad. Nat. Sci. Phila., (2), VI, 1868, p. 

 235, PI. 3, fig. 4. Catawba River, North Carolina. Roanoke River and 

 James River, Virginia. 



Head 4 to 4i; depth 4^ to 5^; D. usually iv, 10, i, frequently 

 IV, 9, I, rarely iv, 11, i; A, iii, 6, i; V. usually i, 8 (both sides), very 

 rarely i, 7 (both sides); scales usually 38 to 44 in lateral line to 

 caudal base, though varies 37 to 47, and 3 more on caudal base; 

 usually 6 scales above lateral line, frequently 5, occasionally 7, 

 rarely 8; usually 5 scales below lateral line, frequently 6, rarely 

 7; usually 15 predorsal scales, often 16, seldom 14, 17, 18 or 19, 

 snout 2i to 2| in head; eye 3j to 4f ; mouth width 3^ to 6; interorbital 

 24 to 3; length 2^ to 6| inches. Nos. 6,920 (type) to 6,925, A. N. S. P., 

 cotypes of Ptychostonius cervinus Cope. Catawba River, North 

 Carolina. Nos. 6,904 to 6,918, A. N. S. P., cotypes, from head- 

 waters of Roanoke River, Virginia. Nos. 6,928 to 6,946, A. N. S. P., 

 cotypes, from headwaters of the James River, ^'irginia. All from 

 Cope. 



Moxostoma rupiscartes Jordan and Jenkins^^ is identical with the 



present species. All its alleged characters of difference are covered 



by the very full series of typical examples noted above. 



Placopharynx carinatus Cope. 



Proc. Amer. Philos. Soc. Phila., XI, 1870, p. 467, figs, (teeth). Lafayette, 



Wabash River, Indiana. 

 No. 22,108, A. N. S. P., type. Lafayette, Indiana. E. D. Cope. 



Five from Beaver River in Pennsylvania (Cope in 1880), also two 



adults likely from the same locality. One without data; nine from 



Cherokee, Iowa; two from Eureka Springs, Arkansas; two from 



Carthage, Missouri. 



" Proc. U. S. Nat. Mus., 1888, p. 353. Carolina and Georgia. 



