146 



an obscure tubercle posteriorly and a strong oblique plait (juxta- 

 posed to the large denticle referred to), together with a few small, 

 irregular tubercles, anteriorly ; canal very long, bent, and slightly 

 twisted. It may be readily distinguished from the species of 

 Latirus already described by its bold spiral ridges and by the 

 absence of pronounced longitudinal costje. 



Dimensions. — Length 24 mm.; breadth 12 mm.; length of 

 aperture 8 mm. ; length of canal 8 mm. 



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



G. 4264. Two examples of the adult. 



Presented lij John Bennant, Esq. 



Latirus SUCCinctuS, Tenison- Woods (sp.). 



1880. Trophon miccinclus, Tenison- Woods, Proc. Linn. See. N.S.W. vol. ir. 



p. 16, pi. iv. figs. 6, 6a. 

 1888. Feristernia succincta, Tate, Trans. Eoy. Soc. South Aust. vol. x. 



p. 158. 

 1893. Feristernia succincta, Tate and Dennant, id. vol. xvii. pt. 1, p. 219. 



Much more tumid than either L. interlineatus or Z. suhui 

 though belonging to the same group. The shell is turbinate ; 

 protoconch similar to those of the two species mentioned ; whorls 

 substaged, strongly spirally ridged, the ridges being relatively 

 far apart and unequal in size, interspaces roughly corrugated, 

 especially on the body- whorl of senile examples, lines of growth 

 occasionally breaking through, obscurely longitudinally costate, 

 this feature being most noticeable in the neanic stage of growth ; 

 aperture rounded ; outer margin striate within ; columella smooth, 

 deeply excavated, and carrying a conspicuous fold anteriorly 

 bordering the entrance to the canal, with a few very small 

 denticles behind ; canal bent and twisted, and rather deep. 



Dimensions. — Length 28 mm.; breadth 17 mm.; length of 

 aperture 11mm.; length of canal 8-5 mm. 



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



G. 4189. An example of the neanic stage of growth, showing 

 longitudinal corrugations. Presented by John Dennant, Fsq. 



G. 5521. A specimen illustrating the adult stage, with anterior 

 canal much twisted. Purchased. 



