88 MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
whorls, the second spirally threaded; on about three of the subsequent 
whorls these threads are developed into two or three major cords between 
the periphery and the suture, becoming on later whorls obsolete, or this 
sculpture in other specimens may be obsolete; there is also a semi-obsolete, 
fine, spiral striation covering the whole surface and somewhat stronger on 
the canal; there is no axial sculpture; aperture narrow, anal sulcus feeble, 
close to the suture hardly forming a fasciole; outer lip thin, slightly pro¬ 
duced; inner lip erased; pillar straight; canal short, wide. Height of shell, 
16; of last whorl, 9; diameter, 5 mm. (Dali.) 
Type in United States National Museum, No. 206602. Type locality, 
Station 3194, off Esteros Bay, California, in 92 fathoms. 
Range. Coast of Washington to Esteros Bay, California. 
Antiplanes amphitrite Dali, 1919 
Proceedings of the United States National Museum, 56 :37; PI. 9, fig. 1. 
Shell white, covered with a pale, olivaceous periostracum, of five or 
more well-rounded whorls exclusive of the (lost) nucleus, having a 
rounded shoulder and distinct, not appressed suture; axial sculpture of, on 
the spire, obscure nodulations at the shoulder (about 15 on the penulti¬ 
mate whorl), which do not form ribs and are absent from the last whorl; 
incremental lines fine but obscure; besides these there are minute, anter¬ 
iorly, obliquely retractive lines somewhat microscopical, reticulated by the 
lines of growth; there is no spiral sculpture except on some specimens a 
few obsolete lines on the base; anal sulcus shallow, slightly removed from 
the suture, the fasciole lightly impressed on the last whorl; aperture 
narrow, the outer lip thin, sharp, arcuately produced; inner lip erased; 
pillar white, solid, straight, anteriorly obliquely attenuated; canal wide, 
straight, distinct. Height of five whorls, 13.5; of last whorl, 10; diameter, 
6 mm. (Dali.) 
Type in United States National Museum, No. 209953. Type locality, 
Station 4415, off Santa Barbara Island, California, in 638 fathoms. 
Range. Off Santa Barbara Island, California, in 638 fathoms. 
Antiplanes amphitrite beroe Dali, 1919 
Proceedings of the United States National Museum, 56:37. 
This variety differs in being larger, with the suture appressed, the 
fasciole close to it, and bearing three or four spiral grooves. Height of 
four whorls, 19; of last whorl, 14; diameter at decollation, 2.5; of last 
whorl, 9 mm. (Dali.) 
Type in United States National Museum, No. 21466a. Type locality, 
off San Diego, California, in 822 fathoms. 
Range. Known only from type locality. 
[ 88 ] 
