76 
'Sifiith .histn;l\an Shells. 
S.A. NAT., VOI.. XIV 
Mn. 1933. 
R. hofmani Angas 1877 {Tornatina) . "Hofman’s Retusa.” 
A’ylindrical. white; growtii lines \ ery fine; spiral striae, few. dis- 
'tant, in'cgiilar, iliscernable toward the lip on the body whorl; 
■protocoiiL'li sharp: whorls fivc-and-a-half, the tiiper adult \vl>..-rls 
sliglitly convex; last whorl a little shouldered above and very 
slightly concave in the middle: suture channelled; mouth narroM' 
above, dilated below, and rounded at the base: outer lip thin, 
ardied when viewed laterally, and slightly contracted in the 
■middle; columella somewhat thickened below, with a small blunt 
fiexuous projection near the base, and covered by a callus extend- 
.ing nearly to the top of tlie whorl. Height 7, diam. 3 mm. 
Dredged — St. I'A^ncis Island, 35 fatlioms, (Type loLx/nty — 
‘Sovr and Pigs Reef, Port Jackson). 
R. complanata Watson 1886 (Utriculus), “The Levelled- 
spire Retusa..' Cb'lindrical, truncated and flat on the top, very 
much and obliquely truncated in front; white; axial furrcjws on 
the lines of growth, strong, curved; spiral furrows over the wbftle 
surface, sharp, irregular, parted by flat intervals of about three 
:times their width; protoconch glossy, depressed, mamillatcd; 
■whorls three, convex, on the to]' of the shell they arc rounded; 
■suture impressed: mouth the full length of the shell, narrow above, 
voblong and roomy in from, club-shaped; outer lip rises rrainJIy 
just above the to}\ its course is straight witli a very slight con- 
cavity ; columella oblique, nearly straight, patulous^ Height 
1.25, diam. .7 mm. St. Francis Island, 15-20 fathoms, one speci- 
men, which agrees with a spcciment from 5-10 fathoms, Hope 
Island, Queensland, (lype locality — West of Cape ^ ork, off 
sciiih-west point of Papua, 28 fathoms, green mud). 
R. hacketti sp. nov. PI. 1, fig. 4. “HacketPs Retusa.’- 
Small, fairly solid, oj aque-white: cylindrical, attenuated in anter- 
ior half; the posterior parr of the shell is the widest part; vertex 
quite flat, except for the prominent mucronatc protoconch; adult 
whorls three: ia.st whorl rises ver_\' slightly above the vertex; 
when viewed from the dorsum, the anterior part on the left side 
(with tlie anterior end upwards) is a little excavated, instead of 
being convex; mouth narrow, dilated and rounded below; outer 
lip straigln. Tvi'ie — Height 4, diam. 2 mm. Cnilf St. Vincent, 
10 fathoms. (Reg. Xo. D. 10659 S. Aus. Mus.). Also dredged 
Backstairs Passage. 10 fathoms. \ ertex may be very slightly 
sunken. Somewhat like R. rnniplcinata Watson, but distinguished 
by its prominent mucrrjnate i-)rotoconch. Ratlier larger and much 
more solid than R, kimberi Cotton & (P)dfrcy (below), and less 
variable in form. Named after Air. \V. Champion Hackett, a 
•keen naturalist and past chairman of the Field Naturalists Section 
cf the Royal Society of South Australia (Inc.). 
