512 CALIFORNIA ACADEMY OF SCIENCES. 140 
scarcely so above; none of them canine-like. Top of 
head with very small scales. Cheeks and opercles with 
rudimentary scales above. Preopercle with a concealed 
antrose hook below as in #/eotrzs. Scales on body very 
small, perfectly smooth, partially imbedded; scales on 
nape and throat minute. Gill membranes extending a 
little forward below, so that the branchiostegals are free 
from the isthmus. 
Insertion of dorsal twice as far from middle ot base of 
caudal as from tip of snout; the fin low, its slender rays 
slightly filamentous. Soft dorsal low, its last ray highest. 
Anal similar, beginning under second dorsal ray. Cau- 
dal long, bluntly pointed behind, with strongly procurrent 
base above and below, the base above two-fifth length of 
head formed of fourteen short rays, that below a little 
shorter, of twelve rays, this procurrent portion forming an 
angle with the caudal proper where it joins it. Pectoral 
and ventrals short, the ventrals inserted under pectorals. 
Color olive green, dusky above, paler below, but every- 
where covered with fine black dots. Both dorsals with 
the membranes pale, the rays each barred with black. 
Caudal mesially blackish, all the rays barred or chequered 
in fine pattern. Pectoral and anal pale, similarly speckled; 
base of pectoral dusky; ventral finely speckled. 
One specimen, 6% inches long, taken by Mr. James 
A. Richardson in the harbor of La Paz. 
This species seems to be the type of a distinct genus 
allied to E/eotr7’s and Frotel?s, distinguished from £/eo- 
tris by its very small cycloid scales, from Fyrotelis by its 
concealed preopercular hook, and from both by the pro- 
current caudal fin. The generic name is from désw, to 
protect; odsd, tail. 
