By Btr/uml C. Cotton and f. k. (zodirry. 
S.A. XAT., \OL. XIV. 
May, 1933 . 
7 ? 
umbilical depression behind it. Height 3. diam. 1.5 mm. St. 
Francis Island 6-20 fathoms. Also Western Australia — Bunbur}v 
King (jcoi'ge Sound, 15-28 fathoms. (Type localit}' — Flinders 
Passage, Cape ^'ork, North Australia, 7 fathoms). \'erv like 
Utriculus Lruncatulus Bruglere, but that has much stronger axials, 
nr. spirals, and an oblique crown, sloping down from left to right, 
on which side the top of the mouth and outer lip rise in a rounded 
loop, very considerably above the top' of the bod}'-whor!. 
R. eumicra Crosse &. Fischer 1865 {BnUa). 1^1. 1. fig. 3. 
Subcylindrical. thin; shining; somewhat Transparent, wnte: 
smooth; spire nearly ilat, but the protoconch forms a very small 
j rojecting button. Whorls tliree-and-a-half, last whorl large, 
almost equal to the whole of tlie shell; mouth narrow, but en- 
larged towards tile base. Height 4.5, diam. 2 mm. Common. 
Cuif St. Vincent and Spencer’s Clulf. (4'ype locality — Spcncerks 
Chilf. Somewhat allied to R. pussilla Sowerb}' {Bulla), but dis- 
tinguished from It b}^ the absence of ain' umbilical clelt, by it.^ 
greater length, its shape a little more elongated and more cylin- 
drical, and its spire whorls flat, with the exception of tlie apical' 
button, which is \'ery prominent. 
R. apiculata Tate 1879 (Utricuhis) . “I'he Sunken-spired 
Rctusa.’' Similar to R. einnicra Crosse & Fischer, but distim- 
gulshed b}’ its sunken spire, the papillary protoconch being ex- 
serted beyond the level of the body whorl. The upper part of 
the body-whorl, immediately below the suture, distinctly con- 
T'ex. The lower extremity of the shell is more gradually tapering, 
and the shoulder of the body whorl is less abruptly arched, con- 
sequently Ah apiculata is more fusiform than its ally. It is also 
much larger. Height 15.5, diam. 7 mm. T}-pe localit}' — KInn 
C-eorem Sound, W.A.) 
R. apicma Gould 1859 (Tof^uatitia) (= T. hrerichl^yi An- 
gas 1877; " T. niariae 'I'enison-Woods 1876: = Utricuhis aveii- 
ariiis W atson 1886: ~ Bulla fusifonnis Adams 1854). Ovately 
cylindrical, elongated; shining, white, growth lines very deli- 
cate: only faint traces of spiral striation; protoconch mamillated. 
small, of two wliorls; adult whorls two-and-a-half, somewhat 
devated. turreted; suture deeply but not bi'oadly channelled; 
mouth three-fourths the length of the shell, narrow above, gradu- 
al!}' dilating and curved at the base; outer lip not extending to 
the top of the whorl, and slightly contracted in the middle; colu- 
mellar fold obsolete. Height 5, diam. 2 mm. Gulf St. Vincent: 
St. Fraiuis Island 6-20 fathoms. (Type locality — Sydiic}' Harbor)n 
