102 Transactions. 



Terebratella kakanuiensis, Hutton. Plate XIV, fig. 4. 

 1905 : Trans. N.Z. Inst., p. 479. 



The specimens on which Captain Hutton founded this species 

 were furnished by the author ; they were collected from the 

 quarry, North Head, Kakanui. 



The following description, prepared before the receipt of 

 Captain Hutton' s revision, will simplify in some particulars 

 his description : Broadly ovate ; greatest width at middle ; 

 slightly longer than wide ; valves equally convex, a ridge on 

 the ventral valve, extending from umbo to margin, dividing 

 it into three lobes ; dorsal valve with a deep sinus from the 

 centre to the anterior margin ; umbo produced and slightly 

 curved, bluntly keeled ; foramen large, incomplete ; deltidium 

 a small triangular plate on either side. Surface smooth, with 

 inequi distant lines of growth ; loop short, reflexed, and doubly 

 attached. 



This species differs from T. rubicunda in its much deeper 

 dorsal sinus and shorter loop. Captain Hutton considered it 

 the probable ancestor of T. rubicunda. It somewhat resembles 

 the figures of T. woodsii* 



LiAMELLIBRANCHS. 



Pecten sectus, Hutton. 



1873 : Pecten secta, Hutton, Cat, Tert. Moll., p. 30. 1886 : 

 Pecten sectus, Hutton, " Mollusca of the Pareora and Oamaru 

 Systems of New Zealand," Proc, Linn. Soc. N.S.W., p. 235. 

 Two types of Pecten differing from known species were con- 

 sidered by Hutton to be the young of this species. Their de- 

 scription may be of value : — 



(a.) Left valve slightly convex, orbicular-trigonal ; angle as 

 long as high ; ears unequal ; the anterior one with 4 radiating 

 ribs and fine transverse striae. The whole shell is thrown into 

 10 plicae, each dividing at the margin to 2 ribs, the hollows being 

 also occupied by 2 slightly smaller ribs ; the ribs spring from 

 the middle zone of the shell ; concentric lines of growth ; margin 

 crenulate and sinuous. Size, f in. 



(6.) Right valve flat ; shell thrown into 10 plicae, each splitting 

 into 3 ribs near the bottom, the hollows with 1 rib ; surface 

 with very fine concentric striae, and also oblique striae. 



Cardita benhami, nov. sp. 



Shell very convex, subquadrate, slightly inequilateral ; 26-30 

 large radiating ribs, nodulose, a little smaller than the inter- 



*Tatc. Trans. Phil. Soc. Adelaide, 1880. 



