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288 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 
obsolete on the last whorl; suture distinct, marginate, where the riblets are con- 
spicuous as at the periphery and continued to the suture in front; there are also 
fine, 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. 8. * Albatross,” station 3366, off Cocos Island, in 1067 fathoms, ooze, 
bottom temperature 37° F. U.S. N. Mus. 123,118. 
CLATHURELLA Carpenter, 1856. 
Clathurella orariana Da zt, 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 the summits of the 
ribs ; on the last whorl the 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. 5S. “ 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 Da tt, n. sp. 
Plate 14, figure 1. 
Shell small, polished, white, with, on the last whorl and in the throat, a livid 
pinkish tint, ten-whorled; nucleus eroded, but with its first whorl flattish and 
appearing from above discoid and glassy; subsequent whorls glistening, constricted 
and appressed at the suture, with (on the penultimate whorl eighteen) arcuate 
