TOW; columella straight, slightly ierawomely ‘roan ‘lip. acute, ; 
smooth within, scarcely sinuated posteriorly. | 
(21:0725 Mitromorpha filosa Cpr., 1863, sub ? Daphnella. 179. 
Shell 8 mm long, diameter 2.6, body’ whorl 6, aperture 5; 
mitre-shaped; apex rounded; whorls 6, flat, ornamented with > 
several sharp, raised revolving lines; suture impressed; distinct; 
aperture long, narrow, oblique; outer lip denticulate interiorly; 
inner lip smooth; columella spirally lined externally. Santa 
Barbara, Cal., to Todos Santos bay, Baja Cal. 
21:0726 Mintromorpha intermedia Arnold, 1903. (2712). 
‘“‘Shell small, mitre-shaped; apex rounded; whorls 6; slight- 
ly convex; whorls ornamented with about 4 equidistant, sharp, 
raised spiral lines, and numerous rounded, transverse ridges 
which are most prominent on angle of whorl; ridges are obsolete, 
‘or nearly so, on body whorl; suture quite deeply impressed; 
aperture long, narrow, oblique; outer lip slightly arcuate an- 
teriorly, smooth interiorly; inner lip smooth; columella spirally — 
lined externally. Long, 9.5 mm.; body-whorl 6.5, aperture 4.5; 
defl. 36 degrees.”’ 
Considered by Dall as a variety of M. filosa. Berry found — 
this living at Pacific Grove, Cal. (see 2712). Type locality: — 
Dead Man Island; Cal. (Pleistocene). " 
21:0727 Mitromorpha aspera Cpr. 432. : 
_, Brownish, marked with a very distinct sieve-like network 
of fine lines; 5 mm long. Monterey to San Diego, Cal. 
21:0728 Genus Aesopus Gould, 1860. (Subgenus of Columbella 
fide Tryon.) 
Shell fusiform, gibbous, broadly truncate in front; aperture 
lunate, with a posterior callus on body; columbella smooth, vit- 
reous; suture abnormally arcuate near aperture; animal white, © 
foot emarginate in front, obtuse behind; said to be intermediate 
between Columbella and Mitra. 
21:0729 Genus Alaba H. & A. Adams, 1862. 
Shell ovate, conical or elongated, subdiaphanous; whorls 
Plicate or varicose, apex submamillate; aperture ovate, columella 
more or less truncate. 
21:0730 Genus Alderia Allman. 
Animal oblong, without tentacles; head lobed at sides; pa- 
pillae arranged down the sides of back; vent dorsal, posterior. 
21:0731 Genus Alvania Risso (non Leach). (Subgenus of Rissoa 
fide Tryon). 
Shell oval, turbiniform; spire short, apex sharp; whorls 
rounded, usually cancellated; aperture subcircular, crenulated 
within; outer lip with a marginal exterior varix. . 
21:0732 Genus Anisodonta Deshayes, 1860. 
Shell transversely elongated, compressed, inequilateral; 
hinge thick; a large conical tooth and a triangular socket in 
each valve; ligament external; anterior adductor scar very small, 
and comprised between 2 prominent ribs (1 parallel and the other 
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