261 



thin, but slightly thickened above, and abruptly attenuate to the 

 front, not perceptibly reflexed ; umbilical groove smooth. 



Length, 10; breadth, 4'5 mm. 



Habitat. — Royston Head, South Yorke-Peninsula (one ex.); 

 King George Sound (one ex.). 



This species resembles L. jncturata in outline, but differs by its 

 conspicuous cinguli, its convex whorls, and linear suture ; from 

 L. cAngulata it would seem to differ in shape and in its numerous 

 -encircling ribs. 



Leiopyrga quadrieingulata, s/>ec. nov. 



Shell turrited, narrowly perforate, thin, internal shell-layer 

 •conspicuously perlaceous. 



Whorls eight and a half, flatly convex ; apical whorls two and 

 a half, smooth, depressed-turbinate ; the next two are quadrate, 

 margined at the suture ; the following, with an excavated suture, 

 four-ribbed. The ribs are equal, equidistant, compressed, moder- 

 ately elevated (sometimes having an undulose outline), separated 

 by much wider flat furrows. 



Last whorl usually with intermediate smaller ribs between the 

 primaries ; periphery rounded. 



Traces of colour are visible on some specimens, consisting of a 

 diffused purplish tinge on a white ground. 



Length, 1 1 ; breadth, 6 mm. 



Habitat. — One of the characteristic fossils of the Miocene- 

 Tertiary at Muddy Creek; also at Kalimna, Gippsland Lakes, 

 Victoria. 



Leiopyrga Sayeeana, >^ec. nov. 



Like L. quaclricingulata^ but the penultimate whorl has three 

 primary, compressed, acute cinguli, equal and equidistant, and a 

 slender thread at each suture. The cinguli have an undulate 

 outline by reason of inconspicuous arched folds which traverse 

 the width of the whorls. All the spire-whorls are cingulate ; the 

 suture is more or less concealed by the approximation of the 

 sutural threads. 



Length, 11; breadth, 5*5 mm. 



Habitat. — In the Eocene-sandstone on the beach at Beaumaris, 

 near Cheltenham, Port Philip Bay, Victoria ; not uncommon, 

 according to Mr. Sayce, to whom I am indebted for several 

 examples. 



Semele moniliS, ■•^pec. nov. Plate xi., fig 7-7a. 



Shell ovate-oljlong, somewhat compressed, thin, inequilateral, 



subinequivalve (the right valve sliglitly flatter than the left). 



Anterior side the longer, rounded ; the posterior side shorter, 



obliquely truncate in the ventral-half. Ventral margin arched 



