CLASS GASTROPODA 
87 
Type in United States National Museum, No. 224393. Type locality, 
Station 2954, off Santa Rosa Island, California, in 55 fathoms. 
Range. Cape Martin to Cortez Bank, California. 
Antiplanes hyperia Dali, 1919 
Plate 3, fig. 2 
Proceedings of the United States National Museum, 56: 35; PI. 9, fig. 6. 
Shell with more than six hardly rounded whorls (decollate), white, 
with a dark olive periostracum, the base white; suture appressed, distinct, 
the whorl in front of it constricted; spiral sculpture of (on the last whorl) 
a sharp thread or low keel above the periphery, two more at the periphery; 
on the anterior one the suture is laid and it also forms the anterior bound¬ 
ary of the dark coloration; on the base are five less conspicuous threads; 
all these have much wider interspaces; axial sculpture of moderately in¬ 
conspicuous incremental lines; anal sulcus wide and extremely shallow, 
the deepest portion at the posterior keel; there is no well-defined fasciole; 
aperture short and wide, outer lip thin, only slightly produced in front of 
the sulcus; inner lip erased; pillar very short; canal very short and wide, 
but distinct, slightly recurved and with an inconspicuous siphonal fasciole. 
Height of five whorls, 12; of last whorl, 7; diameter of decollation, 1.7; 
of last whorl, 4.5 mm. (Dali.) 
Type in United States National Museum, No. 212329a. Type locality, 
Station off Drake’s Bay, California, in 30 fathoms. 
Range. Off Drake’s Bay to Coronado Islands. 
Antiplanes beringi Aurivillius, 1885 
Vega Expeditionens, Vetenskapliga Iakttagclser, 4: 354; PI. 13, fig. 3. 
Vindlingar 7 l / 2 , svagt konvexa, medolivgron—brungul, slat och glan- 
sandle epidermis, som blott visar fina, pa midten vinskarningen pa yttre 
munkanten endast 2 mm. djup; callus pa columella svag; kanalen kort och 
rak samt bred (dess bredd. 4 mm. pa det storre ex.). Mynning och svalg 
glansande gulroda—svgt rosenfar gade. Langd., 39; bredd., 17 mm. 
(Aurivillius.) 
Type in Natur-historiska Riksmuseum, Stockholm? Type locality, 
Arctic? 
Range. Bering Sea, south of St. Lawrence Islands, to Aleutian and 
Shumagin Islands. 
Antiplanes litus Dali, 1919 
Plate 19, fig. 4 
Proceedings of the United States National Museum, 56:34; PI. 11, fig. 1. 
Shell slender, white, acute, with seven or eight moderately convex 
whorls separated by a very distinct suture; nucleus swollen, twisted, of two 
[871 
