PLEUEOTOMA. 43 



Pleurotoma clarse, Tenison-Woods. 



1880. Pleurotoma clarce, Teuisou- Woods, Proc. Liun. Soc. N-S-W. vol. iv. 



p. 11, pi. iii. fig. 11. 

 1893. Pleurotoma clarce, Tate and Dennant, Trans. Eoy. Soc. South Aust. 



vol. XTO. pt. 1, p. 221. 

 1895. Pleurotoma (Surcula) clarce, Tate and Dennant, id. vol. xix. pt. 1, 



p. 111. 



Shell elongate, fusiform, and thin ; posterior part of the spire 

 ribbed, anteriorly the ribs become obsolete ; shoulder of last whorl 

 obtusely angulate ; entire external surface of whorls covered with 

 small, closely-set spiral liraa ; aperture broad, the broad sinus being 

 situated near the suture. 



From the position of the sinus this species might be classed with 

 Surcula ; but in view of the difficulties of making use of that 

 variable characteristic (which in the case of the present species 

 ranges between the shoulder and the suture, but is nearest to the 

 latter), as already stated, no attempt is here made to separate 

 Surcula from Pleurotoma. 



Dimensions. — Length 17"5mm. ; breadth 6 mm.; length of 

 aperture 9 mm. 



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



G. 4235 and G. 4236. Several specimens, showing range of 

 variation. Presented by John Letma'it, Esc[. 



Pleurotoma samueli, Tenison- Woods. 



[Plate III. Figs. 5a-J.] 



1879. Pleurotoma samueli, Tenison-Woods, Proc. Linn. Soc. N.S.W. 

 [ vol. iii. p. 226, pi. xx. fig. 3. 



1893. Pleurotoma samueli, Tate and Dennant, Trans. Eoy. Soc. South. 

 Aust. vol. xvii. pt. 1, p. 221. 



Shell fusiform, elongate ; protoconch turbinate, composed of 

 three smooth turns, the suture of which is marginate. In the 

 brephic stage the margination is much accentuated, and at a later 

 period of growth gives way to a row of small, distant granules. 

 In the same manner, the median, tuberculated carina of the 

 adult commences in the brephic stage by large obtuse uodulations. 

 The shell is thus described by Mr. Tenison- Woods : — "It is a 

 polished shell, with whorls angular in the middle, supporting 



