51 
21:0691 Genus Admete Moller. . ; 
Shell thin, oval, diaphanous, covered by a thin epidermis; 
spire sharp; last whorl ventricose; aperture oval, feebly chan- 
neled in front; columella arcuated, obliquely truncated, with .ru- 
dimentary plications; outer lip sharp. 
21:0692: Admete gracilior Cpr. 1869 sub..Cancellaria., 2433.. 
Shell 11 mm long, diam. 6.3, body whorl 7.5, aperture 5.5; 
spire elevated, subaente; whorls... rounded to subangular. crossed 
by numerous prominent, rounded ridges which reach. their maxi- 
mum prominence on the angle of the whorl; these become nearly 
obsolete,on anterior part of body whorl; spiral sculpture of num- 
erous fine ridges and furrows; suture deeply impressed, giving 
shouldered apnearance to whorls; aperture ovate; outer lip thin, 
smooth; inner lip only slightly inerusted: columella. with 2. pli- 
cations on inner side; slight umbilical slit; no canal. Dredged 
off Catalina Island, Cal. Pleistocene from Santa Barbara to San 
Pedro, Cal. 
21:0693 Genus Aletes Cpr. 
Shell tubular, irregularly twisted, adherent, aperture rounded, 
columella not plicate. 
21:0694 Aletes squamigerus Cpr., 1856. 
Monterey,%Cal., to Magdalena bay, Baja Cal., better: known 
as Serpulorbis:s. Vermetus s. is another synonym.. Vermicularia 
fewkesii Yates, is the spiral. young, fide Dall. 
21:0695. Genus Aligena H. C. Lea, 1845. 
Shell rounded, triangular, inflated; single small anterior 
tooth under the beaks, separated by a gap from the surfare of 
attachment, under the posterior dorsal margin, of:an elongate 
internal resilium carrying a lithodesma. Type: A. striata Lea. 
21:0696 Aligena cerritensis Arnold. 
Shell 8.5 mm. long, 8 high, 5 in diam.; inequilateral, the 
umbo, being nearly ‘terminal posteriorly; anterior dorsal margin 
nearly straight; anterior extremity quite sharply rounded and 
nrodiced furthest helow middie..rosterior extremity sloping off 
abruptly from umbo and rounded near base; ventral margin 
arcuctt; Sarface. with faint concentric sculpture; umbones small, 
pointed, anteriorly twisted, with a minute tooth below them on ’ 
the cardinal margin, pallial line entre; muscle-scars subequal. 
Cal. (Pleistocene). 
Magdalena bay, Baja Cal. (Orcutt), both living and fossil 
(21:660). Determined by Dall. 4 
21:0°9°7 Genvs Zirfaca (earch) Gray. 1847. 
Name often spelled Zirphaea. Shell oval, cardinal margin 
scarceiy reflected; no. accessory valves, the beaks protected by a 
membrane;. usually a thin fugacious epidermis; anteriorly greatly 
gaping. 
21:0698 Zirfaea gabbi Tryon, 1873. 
Aitains a length of 4 inches; it has been called generally 
treated under the Linnaean name, Pholas crispata (Zirphaea 
crispata); see 981, 99, 2418. Bering Sea to Magdalena bay, 
Baja Cal. * 
