130 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
Philbertia hesione Dali, 1919 
Proceedings of the United States National Museum, 56 :54. 
Shell small, whitish, biconic, acute, with a smooth bulbous nucleus 
of a whorl and a half and four and a half subsequent sculptured whorls; 
suture distinct, not appressed, the anal fasciole close to it, flattish, at first 
with fine spiral sculpture but on the last whorl it becomes nearly smooth; 
other spiral sculpture of a narrow, prominent thread at the periphery 
which is doubled on the subsequent turns, on the last whorl there are 
eleven of the threads, which are somewhat nodulose where they override 
the ribs, with much wider interspaces, and a few close threads on the 
canal; axial sculpture of about 13 somewhat oblique narrow ribs, extend¬ 
ing from the suture to the shoulder on the spire, and on the last whorl 
obsolete on the base; they are separated by wider interspaces and the 
incremental lines are feeble; aperture narrow, the anal sulcus narrow, deep, 
rounded close to the suture, with a conspicuous subsutural callus; outer 
lip thin with a moderate varix behind it, and no internal lirae; inner lip 
erased, pillar short; canal short, deep, distinct, slightly constricted and 
recurved; there is a small nodule at the inner anterior end of the outer 
lip where the canal begins. Height of shell, 9.5 ; of last whorl, 6; diameter, 
4 mm. (Dali.) 
Type in United States National Museum, No. 211333. Type locality, 
Station 2902, off Santa Rosa Island, California. 
Range. Point Pinos to Point Loma, California. 
Philbertia castianira Dali, 1919 
Proceedings of the United States National Museum, 56:15; PI. 2, fig. 1. 
Shell small, white, apex eroded, having five or more whorls exclusive 
of the (lost) nucleus; whorls well-rounded, anal fasciole excavated, close 
to the appressed suture; spiral sculpture of (on the upper whorls in front 
of the fasciole, three, on the last whorl about a dozen between the fasciole 
and the end of the canal) strong, equal, equally spaced, rounded threads, 
with wider smooth interspaces; axial sculpture of (on the penultimate 
whorl 14) low riblets barely reaching the base and starting from the 
shoulder, with subequal interspaces, and becoming obsolete near the aper¬ 
ture; they are subnodulous at the intersections with the spirals; aperture 
rather wide, anal sulcus deep, close to the suture with a subsutural callus; 
inner lip erased; outer lip thin, hardly varicose; canal distinct, short, 
recurved. Height of shell, 10; of last whorl, 6; diameter, 4.5 mm. (Dali.) 
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