343 



Pectunculus globosus, Hutton. 



1873. rectunculus globosus, Hutton, Cat. Tert. Moll. N.Z. p. 28. 



" Vcntricose, subeqiiilateral, as high as long; posterior end 

 rounded, rather broader than the anterior ; umbones rather distant, 

 hinge at right angles to the axis of the shell, slightly curved, teeth 

 oblique." — Hutton. 



Dimensions. — Height 96 mm. ; length 97 mm. 



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



L. 10451. Example of the neanic stage of growth, in which 

 the growth-lines are remarkably regular and distinct; locality (?). 



\_Old Collection.^ 



L. 10512. An immense double-valved specimen ; from Hick's 

 Bay. Sir James Hector Coll. 



L. 10513. Left valve ; from Trelissick (upper beds). 



Sir James Hector Coll. 



L. 10515. Less tumid than typical specimens, both probably 

 referable to this species. Sir James Hector Coll. 



Pectunculus, sp. 



L. 5649. Casts of a large species allied to P. laticostatus ; from 

 Gippsland. Presented hy the Rev. J. S. H. Hot/ce. 



L. 10514, L. 10540, L. 10562. Casts of a species resembling 

 P. globosus ; from the Eocene of Akuakua (lower beds). 



Sir James Hector Coll. 



Genus LIMARCA, Tate. 

 [Trans. Roy. See. South Aust. vol. viii. 1886, p. 135.] 



"Yery inequilateral; cartilage pit lanceolate, excavated on the 

 hinge-line, directed backwards ; hinge-line with anterior denticles 

 and posterior elongated longitudinal teeth. "So area under the 

 umbo."— 7«^«. 



It is allied to Limopsis, though the characters of the cardinal 

 regiou recall Crenella. It agrees with Trinacria by the absence 

 of an umbonal area, but differs in having fewer cardinal teeth. 



Type. — Limarca angustifrons, Tate. 



