74 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
swollen segments gives a slightly cancellated effect to the part of the 
whorl which bears them, but there are no axial ribs, the effect being 
produced rather by depressions between the rather coarse incremental 
lines; aperture narrow, acute behind, the anal sulcus narrow and distinct 
but not very deep, the outer lip in front of it arcuately produced, the canal 
contracted, short, and recurved; inner lip polished and superficially 
erased; the pillar twisted, with a thin layer of callus; operculum present. 
Height of shell, 23 ; of last whorl, 12.5; of aperture and canal, 8; maximum 
diameter, 7 mm. (Dali.) 
Type in United States National Museum, No. 110644. Type locality, 
off Coronado Beach, San Diego, California. 
Range. Burrard Inlet to San Diego, California. 
Clathrodrillia fancherae Dali, 1903 
Plate 19, fig. 8; Plate 3, fig. 4 
Proceedings of the Biological Society of Washington, 16:172. Proceedings of the 
United States National Museum, 56: PI. 8, fig. 3, 1919. 
Shell slender, elongate, of a dark reddish-brown when fresh; nucleus 
somewhat swollen, smooth, of about two whorls; subsequent whorls about 
six or seven, similarly sculptured; axial sculpture of numerous low slender 
flexuous riblets with wider interspaces, extending from the suture to the 
periphery and obsolete on the base of the shell; these are crossed (between 
the sutures) by from four to six subequal threads, of which those on the 
periphery are somewhat more prominent, and all are slightly nodulous 
where they override the riblets; on the base there are about 15 of these 
threads with somewhat wider interspaces; aperture rather narrow, outer 
lip sharp, flexuous, the anal sulcus wide and shallow, halfway between 
the suture and the periphery; pillar lip smooth, canal rather long, straight, 
and open. Length of shell, 10.5 ; of last whorl, 6.0; max. diam 3 0 mm' 
(Dali.) 
Type in United States National Museum, No. 109303. Type locality, 
near Avalon, Catalina Island. 
Range. Santa Rosa Island, California, to Point Abreojos, Lower 
California. 
Clathrodrillia rhines Dali, 1908 
Proceedings, Philadelphia Academy of Natural Sciences, 1865. Proceedings of the 
United States National Museum, 56: PI. 8, fig. 5, 1919. 
D. t. “D. incisae juniore” simili, sed omnino albido, sculptura elevata, 
baud coelata epidermida tenui; anfr. nucleosis? .... (detritis) ; nor- 
174] 
