156 



SIPHONALIA. 



suture, and which rises into compressed subacute projections on 

 distant, longitudinal costse ; the spiral ornament is rendered 

 granulate by the crossing of the frequent, scaly lines of growth ; 

 aperture ovate, broad ia front ; outer margin thin, lirate within, 

 peristome continued over to the columellar border, from which 

 it is slightly detached ; canal long, oblique, and twisted. 



Dimensions. — Length 17 mm.; breadth 6 mm.; length of 

 aperture 4 mm.; length of canal 5-5 mm. 



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



G. 9443. Three examples of the adult. PurchasedA 



Siphonalia styliformis, Tenison-Woods (sp.). 



1880. Tiisus styUformis, Tenison-Woods, Proc. Linn. Soc. N.S.W. vol iv.J 

 p. 12, pi. iii. fig. 6. 



1888. SipJw sii/liformis, Tate, Trans. Eoy. Soc. South Aust. vol. x. p. 145.1 



1889. Si'pho styliformis, Dennant, id. vol. xi. p. 41. 



Shell fusiform, spire elevated; whorls convex, with broad, 

 obtuse, distant, longitudinal costse extending from suture to 

 suture, and twisted in series, lines of growth very small, except 

 on the suture, where they rise into reverted scales, spiral lines 

 fairly equal in size, distant, and having a flat area between each ; 

 aperture ovate ; outer margin thin, lirate within, grooved 

 posteriorly ; columella excavated, smooth, sharply turned at the 

 entrance of the long bent canal. 



Pi'ofessor Tate describes the protoconch as follows: "Apex of 

 two smooth whorls, joined to the spire by a thick varix, behind 

 which, for about half a whorl, the surface is costated, thence 

 rapidly enlarging into a globose whorl terminating in a narrow, 

 subimmei-sed tip." 



The shell is relatively broader than in S. tatei, the canal is 

 shorter and more oblique, the longitudinal costse are more con- 

 spicuous, and the whorls are not so markedly polygonal. 



Dimensions. — Length 13 mm.; breadth 5'5 mm. ; length of 

 aperture and canal 7 mm. 



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



G. 4286. An example of the adult. 



Presented ly John Dennant, Esq. 



