nETEROPYGII. 



Two genci-a arc known : — 



Eyes none, or rudimentary 1. Amblyopsis. 



Eves distinct 2. Chologaster. 



1. AMBLYOPSIS. 



Amblyopsis, Dekay, Nat. Hist. Kcw York, FUh. p. 187. 

 Typlilichthys, Girard, Proc. Ac. Nat. So. Pliilad. 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 spela3us, Dekay, I. c. ; Wipnan, in Sillim. Atner. Journ. 



1848, vol. xlv. pp. 94-96 ; or in Atiu. ^ Mac/. Nat. Hist. 1843, xii. 



p. 298 ; Proc. Bost. Soc. Nat. Hist. 1850, iii. pp. 349-3.57 ; 1854, 



iv. pp. 395-396; and 1854, v. pp. 18-19; Sillim. Anier. Journ. 



1854, Tcvii. pp. 258-261 ; Thompson, Ann. Nat. Hist. 1844, xiii. 



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



Ar/assiz, in Sillim. Amer. Journ. 1851, xi. p. 127 ; Poey, Mem. 



dub. ii. p. 104. 

 Typhlichtliys subterraneus, Girard, I. c. 



B. 6. D. 10. A. 9. V. 4-0. C^c. 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. 



h, c, d, e, f. Adult and halfgrown. 



g. Adult : skeleton. Presented by G. H. Virtue, Esq. 



Variety ivWiout ventral fins : — 

 7(. Halfgrown. Mammoth Cave. Presented by Capt. J. G. Godman. 



2. CHOLOGASTEPv. 



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

 This genus differs from Amhlyojpsis in being provided with eyes. 

 Ventral fins none. 

 South Carolina. 



1. Chologaster cornutus. 



Agasssiz, I. c. 

 Snout with two horn -like projections above. 

 Ditches of rice-fields in South Carolina. 



