108 



whorls 7-8, convex, subangulai- and somewhat concave at the 

 suture very distinctly and slenderly cancellate throughout 

 (the spiral lirse being a little smaller than the longitudinal 

 with a tendency especially at the base to become alternately 

 large or small) at the angle coronate with rounded ribs which 

 are obsolete below (about 14 on last whorl) aperture oval ; 

 outer lip acute, simple, columella excavated anteriorly and 

 slightly twisted ; canal short. Long. 24, lat. 13. Long 

 apert. 13. 



In form a good deal like one existing C. costata, Quoy, 

 but the ribs are smaller and neater while the cancellation 

 entirely removes it. from any Australian species. In the 

 European Miocene Buccinum, 2^1i'iJippi, Micht., appears the 

 nearest form, but that is very different — more turriculate, 

 not ribbed on the lower whorl, lip thickened, etc. Some of 

 the Belgian Eocene forms come perhaps a little nearer. 



OoMiNELLA LYE^cosTATA. U.S. Shell rather small, fusiform 

 turretted, lirate and costate ; apex smooth white, tur- 

 binate of 2^ whorls, whorls S, rounded, closely, ribbed with 

 round prominent ribs (16 on last whorl), and very conspicu- 

 ously spirally lirate, with lirse which pass over the ribs ; in 

 addition to which the whole shell except the apex is finely 

 cancellate, suture deep and margined ; aperture oval, outer 

 lip acute, finely crenulate, columella twisted, canal much 

 recurved with a distinct enamelled plait passing from the 

 centre of the notch to the back of the columella. Long. 19, 

 lat. 7. Long, of apert. 7. 



In older larger specimens the ribs become obsolete in the 

 body whorl, but as the dimensions grow they are very con- 

 spicuous, and extend from suture to suture without alteration. 

 Approaching in character the Miocene Buccinum 2)rismaticum, 

 Broc, of Vienna, but all the fossils of Europe difl:er much 

 in the aperture, and have the inner lip reflected over the 

 columella. This species differs from the last in the whorls 

 not being angular nor coronate ; in the larger lirse, the more 

 prominent ribs, the contorted canal, and the general form. 



Thala marginata. U.S. Shell small slenderly fusiform ; 

 apex obtuse smooth, shining, of three whorls; whorls 7,i'ounded 

 oblique, plicate, sub-angular, coronate and conspicuously 

 grooved above, finely spirally lirate, and undulately striate 

 with lines of growth which show the semilunar sinus very 

 plainly upon the groove ; plaits anteriorly absolete on the body 

 whorl ; suture conspicuously marginate ; canal straight, nar- 

 rowl}^ ovate, canal prolonged, equalling the aperture in height, 

 outer lip thin, inner lip reflected on the columella, and with 

 3-4 very distinct plaits. Long. 8, Lat. 3|, length of aperture 

 to the end of canal 5. 



