116 
1610 Nitidella incerta 
Galapagos Islands. 
1611 lLitorina (Tectarius) atyphus 
Manta, Ecuador. 
1612 Nassa brunnesostoma 
Type locality: near the mouth of the Colorado river, Gulf of 
Cal. (Edward Palmer). 
Described by Stearns, Nautilus 7:10. 
1613 Williamson, M. Burton: 
Edible mollusks of southern California. Nautilus 7:27. 
1614 Yoldia Montereyensis 
“Shell large, stout, inflated, with a polished, dark greenish 
olive epidermis; beaks eroded in all the specimens, situated in 
the anterior part of the middle third of the shell, not prominent; 
valves full and rounded, anterior end evenly rounded into 
the upper and basal margins; posterior end narrower, round- 
ed, the extreme end nearer the cardinal margin with which it 
almost forms an angle, below sloping obliquely toward the basal 
margin, with a very obscure broad ray impressed in a radiating 
manner from the beaks toward the oblique slope, the profile of 
which it does not perceptibly indent; surface sculptured only by 
feeble incremental lines; epidermis polished with 1 or 2 darker 
concentric color zones and a microscopic, irregular, radially dis- 
posed wrinkling, most conspicuous at the margins of the im- 
pressed ray; posterior cardinal margin nearly straight, anterior 
ditte evenly rounded; interior porcellanous white, the pallial 
sinus not reaching the middle vertical line of the shell, broad and 
rather rounded; ligamental fosset large, cup-like; anterior teeth 
V-shaped, about 22 in number, strong and prominent; posterior 
teeth similar, and forming an equally long line but only 18 in 
number, the posterior cardinal margin showing a long narrow 
impressed area very feebly marked; length of shell 32; beak 
from anterior end 12; vertical from beak to base 17; max. diam. 
13 mm.’’—Dall, Nautilus 7:29. 
Type locality: Monterey bay, Cal., in 382 fms. 
1615 Acanthochites exquisitus 
peer locality: Los Animas bay, Gulf of Cal. (see Nautilus 
reR ae 
“Visible portions of the valves extremely narrow, generally 
less than % the entire width of the dried animal. Valves dark 
olive, interior blue; the girdle light green, tufts very large, either 
green, pink or bronze; fleshy covered with a green pubescence. 
Length 30, breadth 18 mm. The valves are more covered than 
in any other form, the tegmentum being far less in area than one 
of the sutural lamine.’’—Pilsbry, Nautilus T:82. 
1616 Genus Anadenus 
“Animal limaciform, subcylindrical, tapering behind; tenta- 
cles simple; mantle anterior, concealing an internal shell-plate; 
no longitudinal furrows above the margin of the foot, and no 
caudal mucus pore; a distinct locomotive disk; external respir- 
atory and anal orifices on the right posterior margin of the man- 
tle; orifice of combined genital system behind and below the 
right eye peduncle. Internal shell-plate small, oval, flat, with 
posterior nucleus and concentric strie. Jaw with numerous ribs. 
Lingual membrane with tricuspid centrals, bicuspid laterals and 
quadrate marginals.’’—Binney. 
