261 



rather more callous at the posterior of the inner margin ; its 

 outer margin is much drawn out in front, and the rounded 

 anterior of the aperture is reflected. 



Professor Tate compares it with JY. rejoanda, Deshayes, to wliich 

 it also bears some resemblance. 



JDimensions. — Length 25 mm.; breadth 22 mm.; length of 

 aperture 18 -5 mm. 



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



G. 4281. Two examples, in one of which the inner margin of 

 the aperture is extremely callous. PresenUd hy John Dennant, Esq. 



G. 9407. Examples illustrating stages of growth. Purchased. 

 Natica (Lunatia) polita, Tenison- Woods. 



1876. Natica polita, Tenison- Woods, Pap. Eoy. Soc. Tas. 1875, p. 23, pi. i. 



fig. 4. 

 1893. Natica [Naiicina) polita, Tate, Trans. Roy. Soc. Soutli Aust. vol. xvii. 



pt. 2, p. 325. 

 1895. Natica polita, Pritchard, Proc. Roy. Soc. Vict. vol. viii. n.s. p. 112. 



The spire of this small species is frequently more elevated than 

 in N. perspeotiva or N. suhstolida; the suture is canaliculate, growth- 

 lines very oblique, and the whorls are faintly spirally striated; 

 umbilicus almost circular, deep, and without a funiculus. It is 

 not unlike the young of N. catena. Da Costa, though the suture 

 of the latter is not cut in, and its shell is relatively broader. 



Dimensions. — Length 9 mm. ; breadth 7'75 mm. 



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



G. 9409. Several examples of the adult. Purchased. 



Natica (Lunatia) perspectiva, Tate. 



1893. Natica (Naticina) perspectiva, Tate, Trans. Roy. Soc. South Aust. 

 vol. xvii. pt. 2, p. 326, pi. s. fig. 7. 



Shell globose ; spire short, suture well defined ; lines of growth 

 prominent, oblique, whorls indistinctly spirally striated ; umbilicus 

 broad, deep, striated, defined in front by an encircling keel, not 

 funiculute. 



It may be compared with iV. liniata, but its protoconch is not 



