130 



with spiral threads and angular costre. The three posterior whorls 

 are a little concavely depressed in the posterior-third ; tlie 

 rounded spiral threads (about twelve on the first whorl), wliich 

 are about as wide as the interspaces, increase in number with tlie 

 revolution of the spire. On the fourth and lifth wliorls, adjacent 

 to the anterior suture, the tln-eads are reduced to stri<e ; and on 

 the body-whorl the anterior lialf is smooth, or nearly so. 



The cost?e begin to apjDear on the front half of the second 

 posterior-whorl, and on the three anterior whorls have attained 

 to stoutish, wedge-shaped, slightly curved angular ridges, which 

 are continued in subdued strength to the anterior suture, but do 

 not reach the posterior one. 



Last whorl with about nine transversely elongate costae on the 

 periphery, not much attenuated to the broadish open canal which 

 is bent to the right and slightly reverted. Aperture elongate-oval, 

 narrow ; the outer lip straight medially (the last whorl being 

 flattened between the anterior tubercle and the lip), hardly as- 

 cending but slightly insinuate at the suture, patulous at the 

 front. Columella nearly straight to the slightly incurved tip ; 

 with five equi-distant plaits, the first and fifth of which are 

 smaller than the others. 



Dimensions. — Length, 77 ; breadth, 22 ; length of aperture, 49. 



Localities. — Calciferous sandstone. River Murray clifis, near 

 Morgan ; lower beds at Muddy Creek. 



22. Voluta lirata, Johnston. Plate ii., fig. 4. 



Reference. — Proc. Roy. Soc, Tasmania, for 1879, p. 37, 1880 ; 

 F. AUporti, Johnston, Geol. Tasm., t. 30, fig. 10 (1888), non 

 1880. 



Shell ovately fusiform, rather thin, smooth, shining. Pullus 

 broadly conical, of four smooth, flattish whorls, with an im- 

 pressed suture. 



Whorls three and a half, excluding pullus, moderately convex 

 at the anterior-third ; ornamented with curved, slender, rather 

 angular costa?, crowded on the posterior whorl ; and sculptured 

 transversely with very fine lines of growth. 



Last whorl a little ventricose at the jDeriphery (where the cos- 

 tulie are only conspicuous), gradually tapering to the broadish 

 front. Aperture elongate-oval, much longer than the spire ; 

 outer lip bevelled to a thin edge, a little emarginate and ascend- 

 ing at the suture, almost straight medially, patulous at the front ; 

 canal short, open, turned to the right, hardly reverted; columella 

 arcuate towards the front, with four ecjui-distant, equal, oblique 

 plaits. 



Dimensions of largest example :— -Length, 69; breadth, 27; 

 length of aperture, 50 ; height of pullus, 5 ; breadth, 5-5. 



