154 SIPHONALIA. 



TritonofusTis labrosus, Tate (sp.). 



1888. Sip/io labrosKs, Tate, Trans. Roy. Soc. South Aust. vol. x. p. 144, 



pi. iii. fig. 7. 



1889. S'lpho labrosus, Cossmann, Ann. Geol. Univ. t. v. p. 1089. 



Shell thin, narrow, elongate; protoconch composed of one and 

 a half smooth globose turns, terminating abruptly against the 

 shell proper, the ornament of the whorls not being foreshadowed ; 

 whorls angulate at the periphery, and carrying prominent, 

 elevated, distant, irregular spiral threads, broken up by longi- 

 tudinal lineations and growth - lines ; aperture rounded; outer 

 margin having a tendency to become varicose, peristome con- 

 tinued, detached from the columella ; canal long and slightly 

 curved. 



This differs from T. (yrebrigranasus in having subangulate whorls, 

 in the lineations not being so closely set, and in their irregularity, 

 also in the special character of the protoconch and continued 

 peristome. 



Dimensions. — Length 6 mm.; breadth 25 mm.; length of 

 aperture and canal 3 mm. 



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



G. 9445. An example of the neanic stage of growth. Purchased. 



Genus SIPHONALIA, A. Adams. 

 [Ann. Mag. Nat. Hist. ser. 3, vol. xi. 1863, p. 202.] 



Shell ovately fusiform, rather thin ; body-whorl ventricose, 

 usually nodosely costate and spirally lineated ; aperture oval, 

 outer margin thin ; columella smooth, excavated, not plicate ; 

 canal twisted, generally short. 



2ype. — Buecinum cassidariaforrms, Reeve. 



Siphonalia longirostris, Tate (sp.). 



1888. Siphonalia longirostris, Tate, Trans. Roy. Soc. South Aust. vol. x. 



p. 143, pi. xi. fig. 8. 

 1893. Siphonalia longirostris, Tate and Deunant, id. vol. xvii. pt. 1, p. 219. 



This species is very variable in character, but in general the 

 shell is elongate-fusiform, with a high scalariform spire ; protoconch 

 composed of two smooth turns, the later being spirally subcarinate 



