HOY’S COTTUS. 987 
preopercular spines generally short, covered by the skin; skin smooth or vari- 
ously prickly, without scales; villiform teeth on jaws and vomer, and in some species 
on palatines also; gill-membranes fully united to the wide isthmus, over which they do 
not form a fold; no slit behind fourth gill; branchiostegals 6; dorsals nearly or quite 
separate, the first of 6-9 slender spines; ventrals I, 3, or I, 4. Fishes of small size, in- 
habiting clear waters in the northern parts of Europe, Asia, and America. The species 
are numerous, and difficult to distinguish, as they are all very similar in form and color- 
ation. The development ef the palatine teeth in some of the species is so slight that 
their presence cannot well be used as a generic character. 
It is not unlikely that other species besides those mentioned below may be found in 
Lake Hrie or its tributaries. 
ANALYSIS OF SUBGENERA AND SPECIES OF URANIDEA. 
a. Palatine teeth peo eLey ventrals (in our species) I, 3; skin smooth or nearly so. 
( Uranidea.) 
b. Preopercular spine prominent, straight, directed backwards, and but little up- 
- wards. : A : : HOYI. 
bb. Preopercular spine Series hooked dperards: 
c. Pectorals short, not reaching anal. , : : FRANKLINI. 
ce. Pectorals long, reaching anal. : : : GRACILIS. 
aa. Palatine teeth present; ventrals (in our ec I, 4. ; 
ad. Skin smooth, or prickly in the axil only. : : ( Potamocotius. ) 
e. Preopercular spine short, hooked; dorsal rays about VII-17; anal about 12. 
RICHARDSONI. 
“. Pectoral rays all simple. 
y. Spinous dorsal very low, of six spines; palatine teeth little developed ; 
body small and slender. (Subspecies.) : : 2 bairdt. 
yy. Spinous dorsal well developed of 7 or 8 spines; palatine teeth well de- 
veloped ; body robust. (Subspecies. ) 5 6 : caroline. 
ac. Upper pectoral rays branched. (Subspecies.) . : . wilsoni, 
dd, Skin of back and sides covered with prickles. 
f. Preopercular spine short ; prickles villiform. : 6 ( Cottopsis.) 
jf. Preopercular spine long, strongly hooked ; prickles stiff. 5 ( Tauridea.) 
SPILOTA. 
158. URANIDEA H)yI Putnam. 
Hoy’s Cottus. 
Uranidea hoyi, PUTNAM, Mss.—NELSON, Bull. Ills. Mus. Nat. Hist., 1876, 41.—JORDAN, 
Proc. Ac. Nat. Sc. Phila., 177, 63; Man. Vert., Ed. 2d, 1878, 253. 
Description —Grayish olive, speckled and barred; body rather slender ; female with 
the anterior parts of body and above lateral line covered with sparse prickles; male 
apparently smooth; head narrowed forwards; jaws narrow, about equal; maxillary 
reaching front of pupil; preopercular spine prominent, longer than pupil, sharp, almost 
straight, directed backwards and but little upwards; below this is another sharp, prom- 
inent spine, also nearly straight, directed partly downwards; 1 or 2 minute concealed 
