124 PROCEEDINGS : BOSTON SOCIETY NATURAL HISTORY. 
chiae large, equal filaments. Isthmus long, narrow or slender trenchant 
keel. 
Scales large, finely ctenoid, above lateral line in series parallel with 
its course, and below in horizontal series. Head scaly, with about 
two rows on cheek, and scales on opercles large. Large scaly flap 
between ventrals, its length about a fourth of fin. Small pointed 
axillary ventral scale. Caudal base finely scaled, other fins all naked. 
Lateral line complete, largely concurrent with dorsal profile. Tubes 
simple, extend well over scales, and with appearance as if situated 
on smaller accessory scale at front of scale exposure. 
Spinous dorsal inserted about opposite hind edge of opercle, third 
Fig. 4. — Amia powelli, sp. nov. 
spine longest, first and sixth subequally shortest. Soft dorsal inserted 
slightly nearer caudal base than hind eye edge, front rays highest. 
Spinous anal inserted about opposite soft dorsal origin, second spine 
much longer than first. Soft anal like soft dorsal, only smaller, and 
fin reaching If to caudal base. Caudal (damaged) apparently 
emarginate? Pectoral moderate, about reaches soft dorsal origin, 
median rays longest. Ventral inserted little before pectoral origin, 
reaches f to spinous anal origin or to vent. 
Color in alcohol largely dull brownish, upper surface everywhere 
