CLATHCEELLA. 59 



Genus CLATHURELLA, Carpenter. 



[Mazatlan Cat. 1857, p. 399.] 



Differs principally from Mangilia in its whorls being more 

 rounded and cancellate ; sinus varicose and sutural ; inner margin 

 of the aperture denticulate posteriorly. It is closely allied to that 

 genus, however. 



Type. — Pleurotoma purpurea, Montagu. 



Clathurella bidens, Tenison-Woods (sp.). 



1879. Mangelia bidens, Tenison-'Woods, Proc. Linn. Soc. N.S.W. vol. iii. 



p. 227, pi. sx. fig. 2. 

 1895. Mangilia bidens, Tate and Deunant, Trans. Roy. Soc. South Aust. 



vol. xix. pt. 1, p. 111. 



Protoconch composed of two smooth, angulate, elevated turns. 

 Shell fusiform, tumid ; whorls six in number, obliquely costate 

 and distinctly Urate ; between the subangular periphery and the 

 deeply-cut suture the lirse are smaller and more numerous. 

 Aperture rather broad ; outer margin varicose, produced, and thin 

 at the edge, dentate within ; sinus large, broad, and situated near 

 the suture ; inner margin curved, with a callous denticle posteriorly ; 

 columella slightly twisted ; canal broad and short. 



Dimensions. — Length 15 mm.; breadth 7 mm. ; length of 

 aperture 8 mm. 



Form. a?id Loc. — Eocene : Muddy Creek, Victoria. 



G. 4202. Four examples. Presented by John Bennant, Esq. 



Clathurella obdita, sp. nov. 



[Plato III. Figs. lU-J.] 



Shell fusiform, elongate, solid ; protoconch composed of one and 

 a half smooth, convex turns terminating abruptly against the shell 

 proper, which, even in the brephic stage, is distinctly angulate, 

 and possesses the general characteristics of the ornamentation of the 

 adult. Whorls live in number, spirally lirate throughout, the lirte 

 being larger and farther apart in front of the peripheral sub- 

 angulation. The growth-lines develop into equidistant, oblique, 

 inconspicuous costae, best seen in the early stages of growth ; and 



