Fossil Fa?ina, Table Cape Beds, Tasinaina. Ill 



distinct, broad and deep sinus just below the rather prominent 

 subsutural band and situated in the concave posterior thiixl. 

 Sinus about half as deep again as broad, thence the outer lip 

 projects prominently forward, then gently arched to join the 

 antei'ior canal. Columella simple, slightly bent and tapering. 



Posterior whorls ornamented with slightly oblique costte, 

 developed in the anterior two-thirds of the whorls and extending 

 right up, though gradually fading, to the anterior suture, thus 

 leaving the posterior third practically free from costulate eleva- 

 tions. On the anterior whorls the cost;e fade sooner towards 

 the anterior sutui'e, though strongly elevated and prominent 

 medially, giving rise to the appearance rather of a medial band 

 of nodules or tubercles than to fully-developed costpe. Costa? or 

 tubercles number about nine to a whorl. Spiral ornament 

 consists of four or five strong spiral threads in the anterior two- 

 thirds of each whorl, while the body-whorl shows about eight or 

 }une, and one strong thread just adjacent to the posterior suture, 

 making rather a prominent and characteristic subsutural band. 

 On the posterior whorls the anterior group of threads are com- 

 paratively broad, with narrower grooves between, but anteriorly 

 the grooves widen out till on the penultimate whorl the grooves 

 or interspaces are broader than the threads, and become still 

 more distinctly so on the body-whorl. As the grooves widen out 

 much finer spiral threads become visible in this space, the inter- 

 spaces on the body-whorl showing three of these finer intercalated 

 threads. In the concave space between the subsutural band and 

 the threads of the anterior portion of the whorl, which is 

 occupied by the growth-lines of the sinus, there are two or three 

 fine spiral threads, with still finer threads, just visible under a 

 lens, on either side of them. The costse and spii'al ornament are 

 both traversed by fine and close lines of growth, which by their 

 marked sinuation and forward curvature clearly indicate the 

 nature and position of the shell. 



Dimensions. — Length, 24 nmi. (without embryonic whorls) ; 

 breadth, 8 mm. ; length of aperture, 6 mm. ; breadth of aperture, 

 3 mm. ; length of canal, 6 mm. 



Locality. — Eocene beds of Table Cape, Tasmania. An impei*- 

 fect specimen from Spring Creek, Victoria, probably represents 

 this species. 



