TORNATELLiEA. 9 



Dimensions. — Length 14 mm. ; breadth 7 mm.; length of 

 aperture 9 mm. 



Form, and Loc. — Pliocene : " Lower beds " at Wanganui, N.Z. 



G. 464. Two specimens. Presented ly Lieut.- Col. W. Wiliner. 



Genus TORNATELL^A, Conrad. 

 [Journ. Acad. Nat. Sci. Philad. (n.s.) vol. iv. p. 294.] 



Several authors have confounded Tornatellma with Solidula, but 

 it may be readily distinguished from the latter by the marked 

 depression on the anterior portion of the aperture ; by the difference 

 in disposition of the columellar plications, which are brought more 

 prominently forward, the foremost anterior plication being situated 

 relatively nearer the anterior extremity of the shell ; and by the 

 greater thickness of the shell in the neighbourhood of the outer 

 border of the aperture, which is frequently crenulated. These 

 characters suffice, also, to justify separation from Actceon, sensu 

 stricto. It may be remarked, that the fossil usually known as 

 Actceon simulatus, from the Barton beds, is undoubtedly a re- 

 presentative of this American genus in England. Tornatellcea, 

 moreover, has sometimes been confused with Tornatella, Lamarck, 

 which is a synonym of Actceon. 



Tijpe. — Turnatellcea hella, Conrad. 



Subgenus TRIPLOCA, Tate. 

 [Journ. Roy. Soc. N.S.W. vol. xxvii. 1894, p. 186.] 

 The principal difference between this and Tornatellcea, sensu 

 stricto, consists in the former having three columellar plications 

 instead of two, the two anterior of which are situated close 

 together ; the spire is longer, and the outer border of the aperture 

 is not crenulated. 



Type. — Triploca ligata, Tate. 



Tornatellsea (Triploca) ligata, Tate (sp.). 



1894. Triploca ligata, Tate, Journ. Roy. Soc. N.S.W. vol. sxvii. p. 186, 



pi. xi. fig. 7. 



1895. Tornatclhea {Triploca) ligata, Cossmann, Ess. Paleoconch. Comp. 



p. 50. 



