218 
The figured example, which I received from Mr. May, has been 
critically compared by me with Mr. Petterd’s type, and is con- 
sidered to be conspecific, though it is larger, and has an addi- 
tional whorl, which has developed the sutural slope absent in the 
younger shell. This may not be a Cyclostrema, and I have been 
inclined to refer it to Homalogyra, but the simple aperture forbids 
such an attachment. The specific name is in allusion to the 
similitude of the shell to that of some species of the helicoid 
genus Charopa. 
Cyelostrema Mayli, spec. nov. PI. vi., figs. 4a-4c. 
Shell minute, very fragile, discoidal, with a flat spire and 
rounded periphery, profundly and widely umbilicated. Proto- 
conch large, oblong, and inflated. Spire-whorls two, slightly 
sloping to the channeled suture ; ornamented by thick and some- 
what irregular growth-folds, those on the body-whorl passing 
across the periphery to the umbilicus; the rounded periphery is 
faintly angled above and below, less so below than above. Aper- 
ture circular, peristome entire and simple. 
Dimensions of figured example.—Major diameter, 1-1; mino 
diameter, 84, height, -4 mm. : 
Habitat.—Tasmania, received from Mr. W. L. May, of Sand- 
ford, in honour of whom I have employed the species-name. 
This is another Homalogyra-like shell, but distinct from 
C. charopa in its flat, not sunken spire, coarse ornament, and 
complete peristome. 
SEcTION TUBIOLA. 
Cyelostrema Angeli, 7’.- Woods, sp. 
Rissoa (2?) Angeli, Tenison-Woods, Proc. Roy. Soc., Tasmania, 
for 1876, p. 153 (1877) ; id., op. crt., p. 122, 1878. 
This species seems congeneric with C. conica, Watson, “ Voy. 
Challenger,” of which Tryon remarks, ‘it is more like a Scalaria.” 
Of Tenison-Woods’ species, the same author says, “ generic 
position doubtful ;” though Tenison-Woods himself remarks, 
op. cit., p. 122, “some authors would place the species in the 
genus Cyclostrema.” 
Habitat.—Tasmania (Blackman’s Bay, ?type), my collection 
received from Mr. May; 8S. Australia, Dr. Verco. 
Though Rissoia-like, yet by its fragile test, and in the absence 
of the opercular characters, it is better placed in Cyclostrematide, 
because of the thinness of the test. 
Tryon figures a Tasmanian shell as Rissoa Angeli, but it is a 
distinct species, hereafter to be described. 
The axial ornament of R. Angeli consists of thick ribs, about 
ten on the last whorl, which cease at the periphery. Ten.-| 
