324 COXTRIBUTIOXS TO NORTH AMERICAN ICHTHYOLOGY IV. 
Ileiul iuiUlmI, the surface soiuetiines crossed by papillary ridges. Body 
with small cycloid scales, irregularly phujed. No lateral line. Yenfc 
jugular, close behind the gill-oi)euiugs. Ventral lins small or wanting; 
pectorals moderate, inserted higher than in most soft-rayed lishes; dor- 
sal without spine, nearly opposite the anal; caudal truncate or rounded. 
Cranium without median crest. Stomach coecal, with one or two pyloric 
appendages. Air-bladder present. Ovary single. Some (and probably 
all) of the species are ovo viviparous. In two of the genera the eyes are 
very rudimentary and hidden under the skin, and the body is translu- 
cent and colorless. Fishes of small size, living in subterranean streams 
and ditches of the Central and Southern United States. Three genera 
and four si)ecies are “ all of the family yet known, but that others will be 
discovered, and the range of the present known species extended, is very 
probable. The <litches and small streams of the lowlands of our south- 
ern coast will undoubtedly be found to be the home of numerous indi- 
viduals, and perhaps of new species and genera, while the subterranean 
streams of the central portion of our country most likely contain other 
species.” {Putnam.) 
{IIetero 2 )ijflii Giinther, vii, 1, 2.) 
a. Eyes rudimentary, concealed ; body colorless. 
b. Ventral fins present Amblyopsis, 153. 
hb. Ventral lins obsolete Typiiliciitiiys, 154. 
aa. Ej'es developed ; body colored ; ventrals obsolete Chologastek, 155. 
153.— AI»IBLir05»SBS DcKay. 
(DeKay, New York Fauna, Fish. 1842, 187: ty^ie Ambhjopsis spelmis DeKay.) 
Eyes rudimentary, concealed under the skin. Surbree of head crossed 
by vertical tactile ridge.s. Gill-membranes fully joined to isthmus. Ven- 
tral tins present, (piite small, close to anal. Colorless fishes of small 
size, inhabiting the cave-streams in the limestone regions of the West- 
ern States. {a/j.,3ko^, obtuse; oY'-jV, vision.) 
520. A. S|>eia;Bis DeKay. 
Colorless. iMouth comparatively large, the length of its cleft about 
ecpuil to base of dorsal. Pectorals reaching front of dorsal; caudal 
long, rather ])ointed. One pyloric ccecum. Head 3 in length; depth 
4.C 1). h; A. 8; V. 4; P. 11. L. 5 inches. Subterranean streams of 
Kentucky and Indiana. 
(DoKay, New York Fauna, Fish. 187; Gunther, vii, 2; Putnam, Anier. Nat. 1872, 
30, lig.) 
15 I.— TVPHIACBITIIVS Girard. 
(Girard, Proc. Acad. Nat. Sci. Phila. 1859, C2: type TijpMichthijs subterraneus Grd.) 
This genus differs from Amhlyojysis only in the absence of the ventral 
