219 
Woods’ observation, “ outer lip thickened,” is not correct, as that 
appearance arises from the coincidence of the thick rib making 
the apertural margin, which it does not always do. 
Cyclostrema erebreseulptum, spec. nov. PI. vii., fig. 5. 
Syn.—Rissoa Angeli, Tryon, IX., p. 358, t. 71, f. 11 (original), 
non Ten.-Woods. 
Umbilicated, turbinate-conical, thin, sordid-white. Whorls 
four, convex, with a well-impressed suture; ornamented with 
sharp, slender, crowded axial threads (30 or more on the last 
whorl, which extend on to the base), and by numerous inter- 
stitial spiral striz. On the base the spiral strie are as strong as 
the axial threads. Aperture circular, outer lip thin. 
Dimensions of figured example.—Major diameter, -9 ; minor 
diameter, ‘76; height, -9 mm. 
Habitat.—Tasmania (received from Mr. May). 
This species is distinguishable from C. Angeli by more tur- 
binate outline, and by its numerous slender axial threads, which 
extend on to the base ; the sculpture recalls C. Johnstoni, which 
is, however, a discoidal shell. I do not regard it as an adolescent 
state of C. Angeli, because the posterior whorls (at any rate the 
penultimate one) have the type of costation as on the body- 
whorl. 
Tryon’s figure shows, and his description states, “sharp rather 
crowded growth-lines,” which are at variance with Woods’ state- 
ment that the ribs are thick and distant; characters borne out by 
the study of authenticated specimens of his species. I do not 
know the source whence Tryon obtained the several Tasmanian 
Cyclostrematids which he so unsatisfactorily figured, and seems 
not to have taken the pains to verify the application of the 
species names which accompanied them. There can be no hesita- 
tion for the opinion that in the present case he was misled into 
an error of identification. 
Cyelostrema australe. * Angas, sp. 
Cirsonella australis, Angas, P.Z.S., 1877, p. 38, f. 16. 
Teinostoma (Cirsonella) australis, Zryon, Man. Conch. X., p. 
107, t. 35, f. 83-84 (copied), 1888 ; cd. Henn. and Brazier, P.L.S., 
IX., p. 175, 1894. 
Cyclostrema Weldii, Tenison-Woods, Proc. Roy. Soc., Tasm. 
for 1876, p. 147 (1877). 
Cyclostrema (Tubiola) Weldii, Zryon, op. cit., t. 33, f. 11, p. 
95 (original), 1888. 
Cirsonella Weldii, Brazier, P.L.S., IX., p. 698, 1895. 
* Cyclostrema is a neuter noun. 
