CLASS GASTROPODA 
65 
Leucosyrinx amycus Dali, 1919 
Plate 3, fig. 7 
Proceedings of the United States National Museum, 56:5; PI. 3, fig. 7. 
Shell white with an ashy-brown periostracum and six or more whorls, 
the apex eroded; suture slightly appressed, especially on the spire; anal 
fasciole wide and deep, somewhat in front of the suture and extending to 
a moderate peripheral carina; behind the carina the shell is feebly, 
and in front of it strongly spirally grooved with wider flat interspaces; 
aperture simple, outer lip thin, produced, inner lip erased, white, pillar 
gyrate but not pervious, canal distinct and slightly recurved. Height of 
shell, 52; of last whorl, 40; diameter, 20 mm. (Dali.) 
Type in United States National Museum, No. 204049. Type locality, 
off Monterey Bay, California. 
Range. Known only from type locality. 
Leucosyrinx persimilis Dali, 1908 
Bulletin, Museum of Comparative Zoology, 43: No. 6, 271; PI. 12, fig. 2. 
Shell large, white, fusiform, with a pale olive periostracum, acute 
spire, and eight whorls, exclusive of the (lost) nucleus, each carrying a 
peripheral keel; suture distinct; whorls behind the periphery somewhat 
flattened, with a shallow constriction just behind the keel; axial sculpture 
only of incremental lines; spiral sculpture between the suture and periphery 
of numerous flat, subequal, strap-like bands separated by narrower, shallow 
channels; periphery with a low, rather wide prominence, giving the effect 
of a keel and sculptured with several similar but larger, stronger, and 
more distant bands, tending to arrange themselves in pairs, and with a 
fine, subsidiary spiral striation upon them; this sculpture extends over the 
anterior half of the whorl, becoming finer and closer on the canal; 
aperture elongate; outer lip thin, sharp; a wide, deep, anal sulcus on the 
posterior slope of the whorl about midway between the suture and the 
periphery; anterior part of the lip arcuate, protractive; body with the 
sculpture erased, white, polished; pillar short, twisted in front obliquely 
truncate and gyrate, but not axially pervious; a touch of brown on the 
edge; canal wide, elongate, slightly recurved, with no fasciole: Long, of 
shell, 95; of last whorl, 70; of aperture, 55; maximum diameter, of shell, 
32; of canal, 7 mm. Operculum brown, oval, the exterior imbricately 
lamellose, the nucleus inside the apical end which is bluntly rounded. 
(Dali.) 
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