221 
misplaced. ‘These are facts which I have assured myself of, as 
regards certain cotypes labelled by Tenison- Woods most obligingly 
given me by Mr. Legrand, as they did not agree with the 
reputed types, and which I further found were at variance with 
the diagnoses. The quotation of C. emmaculata under C. Weldiz 
is evidently another case in point. Mr. Brazier trusted his 
correspondent, and his correspondent may have relied upon on 
the naming in the Hobart Museum; each believing their sources 
of information reliable, they have unwittingly perpetrated a grave 
error. Touching the identity of C. Susonis and C. Weldii, I 
may point out that the essential differences between these two 
so-called species, as indicated in Tenison-Woods’s diagnoses, 
admit of explanation ; they may he tabulated as follows :— 
Weldii—diameters, 2 x 2 mm.; whorls six, growth lines pre- 
sent, umbilicus marginate. 
Susonis—diameter, 1°5 mm.; whorls four, no ornament, 
umbilicus emarginate. 
The smaller size and fewer whorls of Swsonis indicate a 
younger shell. The spiral lines on the base of Weldiz may be 
two or three ; sometimes the one adjacent to the umbilical chink 
is more pronounced, in other examples the spirals are wanting. 
The presence or apparent absence of growth-lines may vary with 
the condition of the test. To sum up in the words of my corre- 
spondent, Mr. W. May, of Tasmania, ‘the margined umbilicus is 
not constant, but varies from several distinct grooves to perfect 
smoothness ;” and, again, “I can see no difference between 
C. Weldiz and C. Susonis”—opinions which I endorse, based on 
_ independent study of, the species. 
Specimens of C. australe in my cabinet, coming from New 
South Wales, Tasmania, and South Australia have the opercula 
preserved. The operculum is concave on the outer face, thin, 
translucent, of seven to eight whorls around a central nucleus, 
obliquely and distantly striated. 
Habitat.—New South Wales (type of Cirsonella australis /) ; 
Tasmania ! (types of C. Weldii and C. Susonis); South Australia, 
Streaky and Fowler Bays (R. Tate), St. Vincent Gulf (Dr. 
Verco !), Noarlunga and Macdonnell Bay (Mr. Adcock !). 
Cyelostrema micron. Ten.- Woods. 
1877, C. micra, Proc. Roy. Soc., Tasm. for 1876, p. 147. 
Cyclostrema (Tubiola) micra, Tryon, Man. Conch., X., p. 95, 
t. 33, f. 13 (original). 
This is more turbinate than C. australe. In addition to its 
Tasmanian habitat, it occurs in South Australia. 
