GdJlif and Gahrid 



Cyclostrkma vkrcoi, sp. nov. (PI. XV., Figs. 11, 12 and 13). 



Slifll veiv iriiiiutu. wliite, opaque, of foui- whorl's including the 

 l)iiitoc(incli. Dise-oidal. widely umbilicated, spire sunken. Whorls 

 erosst'<l l)_v riljlets. a])out seventeen on the last whorl, the inter- 

 vening spaces are smooth with the exception of a median spiral 

 thread on the base. Mouth circular. 



Diiiu iisioiiH of ti/pf. — Height, .27; diameter, .75 mm. 



Lncdhti/. — Dredged oft' Wilson's Promontory. 



()J,s,rr(itlon.—'Yyi)ii in Mr. J. H. Gatlift"s collection. 



Myodora subalbida, sp. nov. (PI. XV., Fig. 14). 



Shell white, ol)long, obliquely truncated posteriorly, rounded 

 autLTit.rly, concentrically ridged, ridges somewhat rounded, re- 

 gularly spaced; about fourteen in number. Umbos central, acute. 

 Tlie Aviiole shell is covered l)y very fine radial striae, under the 

 mici-dscope this sculpture is divided into closely compacted 

 elongate, flattened, hexagonal areas, angularly defined posteriorly, 

 see figures 15 and 16. Right valve convex, with an angle e.xtending 

 from the umbos to the margin, and defining the truncated area. Left 

 valve similar to the right valve, but rather deeper. Pearly inside. 



Dimen.^ions of f ;i pc . — Length antero-posterior, 10. ; undjo-ven- 

 tral, 5.5 mm. 



Locnlifij. — Dredged in aljout seven fathoms. Western Port. 



Oh.^ervotio)! . — Resend)ling M. a/bida, T. Woods, with which 

 species M. corrugata, Verco, is conspecific. Dr. Verco has kindly 

 compared our shell with his type and confirms our opinion that it 

 is distinct from oui- new species. 



Type in Mr. J. H. Gatlift"s collection. 



DosiNiA viCTORiAE, sp. uov. (PI. XVf, Flgs. 17, 18 and 19). 



Shell cream-coloured, i-atlier Iwittle, inaequilatei'al, the anterior 

 side being the shorter. Unibods fairly prominent, slightly in- 

 curved, and situated at about one-tliird of the whole length from 

 the anterior. The concentric sculpture resolves itself into about 65 

 excessively thin erect lamellae, the interstices of which are micro- 

 scopically striate. The interstices are further sculpturd by fine 

 ol)solescent radial riblets which are not seen to ascend the lamellae, 

 and are a little less froiiucnt than the minute striae. Lunular area 



