SrPUONALIA. 155 



and faintly lonoitudinally striate; whorls axially costate, the cost* 

 of the spire-whorls extending from suture to suture, and rounded ; 

 body-wliorl in the adult prominently costate at the periphery only;' 

 the whole of the whorls are deeply spirally lineate, and are crossed 

 by frilled growth-lines, rendci'ing the shell somewhat rugose; 

 aperture pyriform, drawn out in front; outer margin very thin,' 

 sulcated, and sometimes slightly lirate within ; columella deeply 

 concave, covered by a striated thin coating of enamel, not plicate ; 

 anterior canal twisted and sinuous. 



The great length of the canal is a special feature of this species, 

 and it is abnormal for the genus. Its rugose and scalariform 

 spire distinguishes it from all other Australian Tertiary forms of 

 Siphonalia. S. maxima, Tryon, living in Tasmanian seas, is an 

 analogous species. 



Dimensions (of a mutilated specimen).— Length of spire and 

 aperture 63 mm.; breadth 28 mm. 

 Form, atid Zoo. — Eocene : Victoria. 



^ 48052. Three examples of the neanic stage of growth ; from 



S( hnappcr Point. d ' i i 



' ^ I^ur chased. 



G. 9433. An example of the senile stage, minus anterior canal ; 



more rugose than specimens from the other localities; from' 



Mornington. n ? ? 



'^ Fur chased. 



G. 9442. Specimen of the adult, having the canal well 



preserved; from Muddy Creek. Purchased. 



Siphonalia tatei, Cossmann, MS. 



1888. Sipho aspmihis, Tato, Traus. Eoy. Soc. South Aust. vol. s. p 14.5 

 pi. vi. fig. 5. ' 



1893. SiphonaJia tafci, Cossmann, in UtV 



1893. &lpho>,ulia tatei, Tate and Dennant, Trans. Eoy. Soc. South Aust 

 vol. xvii. pt. 1, p. 219. 



Shell elongate, narrow, fusiform; protoconch composed of one 

 and a half smooth whorls, elevated, the earlier portion oblique 

 the later longitudinally co.state, varicose at its termination 



Ion 



spire 



_ whorls flat, or but slightly convex, polvgonal; ornament 

 consisting of irregularly spaced spiral threads, the most prominent 

 one of wjncli is situated anteriorly in the neighbourhood of the 



' InformatioD kindly suppKed by Professor Tate, at the writer's request. 



