338 
6 
pdeubrO-Witea retrocurvata, n. sp. Pl. xxi Ae and 5, 
' Shell fusiform, of 8 whorls, including a prominent pro- 
toconch of 2 smooth, well-rounded whorls, with a blunt apex. 
Spire-whorls convex, with deeply-impressed sutures. Body- 
whorl large, roundly contracted at the base into a snout, well 
curved dorsally and to the left. Aperture oblong-elliptical, 
opening gradually into an open canal with a wide, shallow 
notch. Outer lip thin and simple. Inner lip a complete 
very thin applied glaze. Columella very long and convexly 
curved, with four oblique plaits, the highest rather distant. 
Valid axial ribs, from suture to suture, twenty-one in the 
body-whorl, concave forwards, trigonal, with widely-sloping 
sides, vanishing rapidly below the periphery of the body- 
whorl. Under the microscope a few obsolete narrow spirals 
are detectible. Over the base are sixteen oblique spirals, issu- 
ing from beneath the inner lip, most valid in front and grad- 
ually vanishing upwards; among them are the larger colum- 
ella plaits. The accremental striz are fine, most marked on 
the back of the canal, where they validly cross the oblique 
spirals. Colour yellow-brown, with a white central broad 
band divided by a narrow colour band; the base is indis- 
tinctly axially flamed with white. 
Dim.—Length, 16°5 mm. ; body-whorl, 10°75 mm. ; width, 
625 mm. 
Locality.—Type from 110 fathoms off Beachport, with 
7 others; in 150 fathoms, 4 moderate. 
The special character is the arched canal. In some of 
the cotypes the axial ribs fade out on the third whorl, and 
in others on the fourth. 
Uae adiorygma, 6625, xxy., figs. 3 and 4. 
Shell small, solid, obliquely elongate-oval, smooth and 
white; apex blunt; whorls four, sloping convex, Suture 
linear, not canaliculate. Aperture oval, narrowed behind, 
widely open in front, notched; outer lip ascending at the 
suture, simple, bevelled inside; inner lip a glaze over the 
columella, which has no plaits. 
Dim.—Length, 5'°2 mm.; of body-whorl, 3°35 mm.; 
width, 2°3 mm. 
Locality.—Type from Backstairs Passage, 17 fathoms, 
with 1 other specimen; Gulf St. Vincent, depth unrecorded, 
2, all dead. 
Diagnosis.—It differs from Olivella in the absence of a 
canaliculate suture, and from the Volutidz in its smooth col- 
umella. Its generic location is not known to me. 
