CANXnAKUS, 161 



Lines of p;rowth close and conspicuous ; where they cross the 

 hirjier stride near the suture subgranulation occurs. Aperture 

 elliptical, smooth within ; canal wide and short. 



Dimension!). — Length 52 mm.; breadth 16'5mm. ; length of 

 aperture and canal 25 mm. 



Form, and Loc. — Eocene : Muddy Creek, Yictoria. 



G. 4169. An example of the neanic stap;e of growth. 



Presented hy John Dennant, Esq. 



G. 9482. Senile specimen, spiral lineations accompanying the 

 suture well pronounced. Purchased. 



Genus CANTHARUS (Bolten), H. and A. Adams. 

 [Gen. Eec. Moll. vol. i. 1853, p. 84 ; vol. iii. pi. ix. fig. 5.] 



Shell thick, short, anterior canal large ; outer margin thick, 

 varicose ; columella callous, ridged, slightly twisted in front, 

 often carrying a denticle, or small sharp plication anteriorly. 



Tijpe. — liuccinum imdosiim, Linnaeus. 



Cantliarus semicostatus, Tate (sp.). 



1888. Fisaiiia semicostata, Tate, Trans. Hoy. Sec. South Aust. vol. x. 



p. 164, pi. iv. fig. 9. 



1889. TritoiiiJea semicostata, Cossmann, Ann. Geol. TJniv. t. v. p. 1090. 

 1894. Canthariis semicostatus, Tate, Joum. Roy. Soc. N.S.W. vol. xxvii. 



p. 172. 



The examples of this species in the Museum collection are not 

 in a good state of preservation. Professor Tate describes it as 

 follows : — " Shell oblong-fusiform, similar to P{isania) rostrata, 

 with more rapidly increasing whorls, base less abruptly attenuated, 

 canal shorter, costae fewer and stouter. Whorls below the apex 

 four, costae slightly curved, rounded, about as wide as the inter- 

 spaces, 16 on the penultimate whorl, obsolete or only faintly 

 developed on the body-whorl." 



M. Cossmann ' includes Cantharus as a section of Tritonidea, 

 hence the above synonymic reference. 



> Ann, Soc. fioy. Malac. Belg. t. xxiv. 1889, p. 137. 



