338 CUCTJLL^A. 



Cucullsea alta, G. B. Soworby. 



1846. CucnUaa alta, G. B. Sowerby, in Darwin, Geol. Obs. South America, 



Appendix, p. 252, pi. ii. figs. 22, 23. 

 1873. Cucidliea alta, Hutton, Cat. Tert. Moll. N.Z. p. 27. 



None of the specimens in the Museum collection are well 

 enough preserved to enable the writer to identify with certainty 

 the New Zealand form with that from South America, and the 

 determination is chiefly based on the authority of Professor Hutton. 

 The shell is remarkable for its extreme tumidity, great breadth 

 of the area, and immense internal ridge, on which are the scars of 

 the posterior adductor of the valves. 



Dimensions.' — -Height 67 mm. ; length 77 mm. 



Form, and Loc. — Eocene and Miocene : New Zealand. 



83328. Eight valve ; from the mouth of the Kakanui river, 

 Oamaru. Presented by Dr. W. L. Lindsay. 



L. 10440. Two casts of the adult; from Akuakua (upper beds), 

 east coast of Auckland. Sir James Sector Coll. 



L. 10509. Portion of left valve; from Akuakua (lower beds). 



Sir James Hector Coll. 



L. 10511. Left valve of the adult; from Taipos. 



Sir James Hector Coll. 



L. 10561. Both valves, in shelly argillaceous sandstone ; from 

 Akuakua (lower beds). Sir James Hector Coll. 



CucuUsea attenuata, Hutton. 



1873. Cumdlcea attenuata, Hutton, Cat. Tert. Moll. N.Z. p. 28. 



Shell not so tumid as in C. corioensis ; it is much attenuated 

 posteriorly; umbones very broad, distant; area broad, with a few 

 divergent, deeply - cut sulci ; external ornament consisting of 

 closly-set radiating costse, crossed by frequent minute transverse 

 lineations and growth-lines. 



Dimensions. — Height 80 mm. ; length 109 mm. 



Form, and Loc. — Eocene and Miocene : New Zealand. 



