CLASS GASTROPODA 
89 
Antiplanes antigone Dali, 1919 
Proceedings of the United States National Museum, 56:32; PI. 11, fig. 4. 
Shell solid, white with an olivaceous periostracum, spire badly eroded, 
short, indicating a total of five whorls exclusive of the nucleus, the last 
whorl and a half alone retain their normal condition; suture distinct, not 
appressed; anal fasciole narrow, constricted, separated from the suture by 
an obscure ridge; in front of the fasciole is an undulated rounded bridge 
from which extend obliquely protractive obscure riblets more or less obso¬ 
lete on the last whorl, probably stronger and more distinct on the spire 
when not eroded; there is also obscure spiral grooving with much wider 
interspaces on the base; the entire surface is minutely irregularly vermicu- 
late; aperture narrow; anal sulcus shallow, rounded, close to the suture; 
outer lip thin, sharp, moderately produced; inner lip erased, pillar short, 
white, obliquely attenuated in front; canal short, wide, hardly differ¬ 
entiated. Height of (decollate) shell, 23; of last whorl, 18; diameter, 
10 mm. (Dali.) 
Type in United States National Museum, No. 214066b. Type locality, 
Station 2922, off San Diego, California, in 822 fathoms. 
Range. Off San Diego, California, in 822 fathoms. 
Antiplanes amycus Dali, 1919 
Proceedings of the United States National Museum , 56:36; Pi. 11, fig. 5. 
Shell white, covered with a brownish olive periostracum; with five or 
more moderately rounded whorls exclusive of the (lost) nucleus; suture 
distinct with a wide, rounded ridge in front of it, forming the posterior 
boundary of the anal fasciole; spiral sculpture of a few obscure threads 
on the fasciole and in front of the shoulder 8 or 9, on the last whorl 15-13 
flattish, rather close-set threads smaller and closer anteriorly and absent 
from the canal; axial sculpture of more or less distinct incremental lines, 
and the upper spire of about 15 very oblique anteriorly protracted riblets 
chiefly visible at the shoulder and obsolete on or entirely absent from the 
last two whorls; anal sulcus wide, deep, rounded, the fasciole slightly im¬ 
pressed ; outer lip thin, sharp, arcuately produced; inner lip erased, pillar 
short, white, obliquely attenuated in front; canal short, wide, distinct, 
slightly recurved. Height of four whorls, 21.5; of last whorl, 15; diam. 
at decollation, 3; of last whorl, 9.5 mm. (Dali.) 
Type in United States National Museum, No. 226163. Type locality, 
off Monterey Bay, California, Station 3670. 
Range. Monterey Bay, in 581 fathoms. 
[89] 
