288 bulletin: museum of comparative zoology, 



obsolete on the last whorl ; suture distinct, margiiiate, where the riblets are con- 

 spicuous as at the periphery and continued to the suture in front; there are also 

 fiue, well-marked lines of growth, all crossed by close-set, low, spiral threads 

 which become coarser and slightly more distinct on the canal ; anal sulcus deep, 

 wide, rounded, the outer lip in front of it strongly protractive, thin, simple ; body 

 and pillar with a thin wash of callus; the pillar straight, attenuated in front, 

 aperture narrow and lunate, canal short, rather wide, not recurved. Lon. of shell, 

 11.25 ; of last whorl, 8.5; of aperture, 6.5; max. diam. 5.0 mm. 



U. S. S. " Albatross," station 336G, off Cocos Island, in 1067 fathoms, ooze, 

 bottom temperature 37° F. U. S. N. Mus. 123,113. 



CL,ATHIJREL,LA Cakpenter, 1856. 

 Clathurella orariana Dall, n. sp. 



Plate 14, figure 12. 



Shell small, fusiform, white or pale yellowish, dull surfaced, with a nucleus 

 (eroded) and about six subsequent whorls ; suture distinct, not appressed ; whorls 

 rounded ; anal fasciole smooth except for minute arcuate, elevated, more or less 

 distant axial lines, and the intervening incremental lines ; whorl in front of the 

 fasciole axially sculptured with (on the last whorl about twenty-six) moderately 

 strong, equal, rounded, somewhat protractive ribs with subequal interspaces, the 

 ribs extending from the shoulder to the suture or, on the last whorl, to the base, 

 where they become obsolete ; these ribs are crossed on the spire by about six 

 prominent spiral threads, subequal and with wider interspaces, often with a more 

 minute intercalary thread, the primaries somewhat swollen on tlie summits of the 

 ribs ; on the last whorl tlie same sculpture extends over the whorl and upon the 

 canal ; outer lip thin, broadly arcuate, simple, with a rounded, shallow, anal sulcus 

 close to the suture; body with a thin wash of callus, white and smooth; pillar 

 straight, rapidly attenuated in front with a pervious axis; canal wide, slightly 

 recurved. Lon. of shell, 12.0; of last whorl, 8.7; of aperture, 6.0; max. diam. 

 5.0 mm. 



U. S. S. *' Albatross," station 3392, Gulf of Panama, in 1270 fathoms, hard 

 bottom, temperature 36°.4 F. U. S. N. Mus. 123,117. 



This species is not a typical Clathurella, but in the present confused state of the 

 Turritidae no other group seems more appropriate, and it seems unsafe to apply 

 a new sectional name to it until more is known. 



Clathurella panamella Dall, n. sp. 



Plate 14, flRiire 1. 



Shell small, polished, wliite, with, on the last whorl and in the throat, a livid 

 pinkish tint, tcn-whorled; nucleus eroded, but with its first whorl flattish and 

 appearing from above discoid and glassy ; subsequent whorls glistening, constricted 

 and appressed ut the suture, with (on the penultimate whorl eighteen) arcuate 



