84 Proceedings of the Royal Society of Victoria. 



sutures. They are also stronger on the posterior whorls, becoming 

 less distinctly defined anteriorly. Secondly, there are the lines 

 of growth and the tine parallel ntv'vx transverse to the spiral 

 ornament. 



Dimensions. — -The Table Cape specimens are unfortunately 

 imperfect examples, but the measurements which have been made 

 are as follows : Length (apex and end of canal wanting), 22 mm. ; 

 breadth, 7 mm. ; length of aperture, 4 mm. ; breadth of aperture, 

 2*5 mm ; length of canal (incomplete), 7 nun. 



I happen to be fortunate enough to have some perfect though 

 smaller and apparently younger examples of what I regard as the 

 same species fi'om the Spring Creek beds, near Geelong, and on 

 account of their better state of preservation I make one of these 

 specimens the type of the species, the following being its dimen- 

 sions : — Length, 17 mm. ; breadth, 4 mm. ; length of aperture, 

 3 mm. ; breadth of aperture, 1'5 mm. ; length of canal, 7 '5 mm. 



Locality. — Eocene beds of Table Cape, Tasmania. Two 

 examples. Also not uncommon in the lower beds of the lower 

 eocene series of Spring Creek, near Geelong, Victoria. 



Observatio7is. — Up to the present time there has been only one 

 described fossil species referred to this genus from the Australian 

 tertiary deposits, and this has hitherto been obtained rather 

 commonly from the eocene beds of Muddy Creek, Mornington, 

 and from beds of equivalent horizon at several other Victorian 

 localities. This form was originally described by Professor Tate 

 under the name of Fiisus acijormis, but was recently altered by 

 him to Latirofiisus aciforniis.* The present described species 

 may be readily distinguished from L. acijoniiis by its smaller 

 embryonic whorls, by the greater convexity of the spire-whorls, 

 and by its very distinct ornament, having a few strong spiral 

 threads with tiner intercalated ones, and a distinct transverse 

 costation, instead of the tine, cancellated ornament of Z. aci/orjiiis. 

 From the Parisian eocene fossils, and also fi'om the living species 

 referred to this genus, the present eocene form is, as far as 1 have 

 been able to make out, specifically distinct. Type specimen in 

 my own collection. 



• Proc. Roy. Soc. N.S.W., 1S93, p. 171. 



