NO. 2288. NEW MOLLUSKS OF THE FAMILY TURRITIDAE—DALL. 5 



LEUCOSYRINX PERSIMILIS BLANCA, new variety. 



Shell differing from the original persimilis by the well-niarked 

 spiral sculpture being continuous over the whole surface and by the 

 pronounced depressed spiral area on each side of the convex anal 

 fasciole, which with the ridge at the shoulder gives the effect of two 

 parallel ridges behind the periphery. Height of shell, 60; of last 

 whorl, 44; diameter, 22 mm. Cat No. 214337, U.S.N.M. 



Range. — Off Cape Blanco, Oregon, in 1,064 fathoms, mud, bottom 

 temperature 35.9° F. U. S. Bureau of Fisheries steamer Albatross. 



? LEUCOSYRINX GALAPAGANA, new species. 



Plate 3, fig. 2. 



Shell small for the genus, white under a straw-colored periostracum, 

 thin, with about seven whorls exclusive of the (lost) nucleus; suture 

 appressed, the edge slightly swollen, the fasciole in front of it 

 slightly constricted ; axial sculpture of about a dozen narrow rounded 

 ribs with wider interspaces, beginning at the fasciole and obsolete on 

 the base; also fine incremental lines rising to minute wrinkles near 

 the suture: spiral sculpture on the penultimate whorl of about nine 

 flattish threads with narrower interspaces, on the last whorl beyond 

 these threads the interspaces become channeled grooves and the 

 places of the threads wider flat areas, while on the canal these 

 are replaced by more rounded closer threads; aperture narrow, the 

 anal sulcus very shallow, outer lip thin, sharp, arcuate, simple ; pillar 

 and body erased, smooth, the pillar attenuate in front; canal narrow, 

 straight. Height of shell, 20; of last whorl, 14: diameter, 7 mm. 

 Cat. No. 96494, U.S.N.M. 



Range. — Off the Galapagos Islands in 634 fathoms, coral sand, 

 bottom temperature 40° F. U. S. Bureau of Fisheries steamer 

 Albatross. 



I felt some uncertainty as to whether this deep-sea species should 

 be referred to Surcula or Leucosyrinx, as the shell characters partake 

 of the characteristics of both to some extent. 



LEUCOSYRINX AMYOUS, new species. 



Plate 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 ; diam- 

 eter, 20 mm. Cat. No. 204049, U.S.N.M. 



