HETEROPYGII. 



Two genera arc known : — 



Eyes none, or rudimentary 1. Amblyopsis. 



Eyes distinct ..- 2. Chologaster. 



1. AMBLYOPSIS. 



Amblyopsis, Dckay, Nat. Hist. New York, Fish. p. 187. 

 Typlaliclithys, Girai-d, Proc. Ac. Nat. Sc. Philad. 1859, p. 62. 



Eyes none, or rudimentary. A band of teeth on each, palatine 

 bone ; vomerine teeth none. Ventral fins rudimentary and occa- 

 sionally entirely absent. Viviparous. 



Caves of Kentucky. 



1. Amblyopsis spelaeus. 



Amblyopsis spelteus, Dekay, I. c. ; Wyman, in Sillim. Amer. Journ. 



184:3, vol. xlv. pp. 94-96 ; or in Ann. ^~ Maq. Nat. Hist. 1843, xii. 



p. 298; Proc. Bust. Soc. Nat. Hist. 1850, i'ii. pp. 349-357 ; 1854, 



iv. pp. 395-390; and 1854, v. pp. 18-19; Sillim. Amer. Journ. 



1854, x-s'ii. pp. 258-261 ; Thompson, Ann. Nat. Hist. 1844, xiii. 



p. 112; Tdlkampf, in Miillers Arch. 1844, pp. .381-394, tab 9; 



Agassiz, in Sillim. Amet , Journ. 1851, xi. p. 127 ; Poey, Mem. 



Cub. ii. p. 104. 

 Typlilichtliys subterraneus, Oirard, I. c. 



B. 6. D. 10. A. 9. V. 4-0. Case. pyl. 2. Vert. 13/19-20. 

 Head with vertical wrinkles ; lower jaw slightly longer than the 

 upper. Colourless. 

 Caves of Kentucky. 



a. Five inches long. Presented by — "Wedgewood, Esq. 



b, c, d, e, f. Adult and halfgro^vn. 



ff. Adult : skeleton. Presented by G. II, Virtue, Esq. 



Variety without ventral Jins : — 

 h. Halfgrown. Mammoth Cave. Presented by Capt. J. G. Godmun. 



2. CHOLOGASTEK. 



Cliologaster, Agassiz, in Amer. Journ. Sc. ^- Arts, 1853, xvi. p. 135. 

 This genus differs from Amblyopsis in being provided with eyes. 

 Ventral fins none. 

 South Carolina. 



1. Chologaster cormitus. 

 Agasifiiz, I. c. 

 Snout with two horn -like projections above. 

 Ditches of rice-fields in South Carolina. 



