250 CALTPTR^A. 



Calyptrsea corrugata, Tate. 



1893. CahjptrcBa corrugata, Tate, Trans. Eoy. Soc. South Aust. vol. xvii. 

 pt. 2, p. 331, pi. vii. fig. 9. 



Shell thin, depressed, orbicular; protoconch subcentral ; surface 

 of shell irregularly concentrically ridged; edge of internal plate 

 slightly curved. 



Comparing it with the living C. pellucida, Reeve, the author, 

 states that it differs by interruptedly convex whorls and strong 

 growth -folds. 



Dimensions. — Height 375 mm. ; breadth 10 mm. 



Form, and Log. — Miocene : Muddy Creek, Victoria. 



G. 9384. Three examples of the adult. Purchased. 



Calyptrsea crassa, Tate. 



1893. Cahjptrxa crassa, Tate, Trans. Eoy. Soc. South Aust. vol. xvii. 

 pt. 2, p. 332, pi. vii. figs. 2, 7. 



Shell much larger than C. corrugata, solid ; spire elevated ; 

 protoconch coiled, somewhat depressed, subcentral; whorls slightly 

 inflated, suture clearly marked, growth-lines irregular and pro- 

 ducing corrugations on the surface ; edge of internal plate concave. 



Dimensions. — Height 11mm.; breadth 27'5 mm. 



Form, and Log. — Miocene : Gippsland, Victoria. 



G. 9395. Examples of the neanic and ephebic stages of growth. 



Purchased. 



Calyptrsea subtabulata, Tate. 



1877. Trochita calt/ptrceformis, Johnston, Pap. Eoy. Soc. Tas. 1876, p. 86 



(«o« Lamarck, 1822). 

 1888. Trochita calyptrxformis, Johnston, Geol. Tasmania, pi. xsix. figs. 



14, 14a. 

 1893. Cahjptrcea subtabulata, Tate, Trans. Eoy. Soc. South Aust. vol. xvii. 



pt. 2, p. 332, pi. vii. fig. 1. 

 1895. Calyptreea subtabulata, Pritchard, Proc. Eoy. Soc. Vict. vol. viii. 



N.s. p. 113. 



Closely allied to C. crassa, but the whorls increase more rapidly 

 in size, they are less corrugated, and become flat in front of the 



