LAMELLIBEANCHIATA. 



19 



striated ; cardinal teeth small, the anterior lateral tooth of the left 

 valve transversely striated on the outside. Height, 2'2 ; length, 3"7(?). 

 Localities. — Broken Eiver (l). 



15. M. rndis, sp. nov. Sub-orbicular, thin, compressed and 

 rather sinuated, rudely concentrically striated ; anterior side rather 

 shorter, its dorsal margin straight ; posterior dorsal line arched ; 

 anterior lateral tooth of the left valve high ; pallial sinus deep, rather 

 descending, rounded at the apex ; lower margin irregular in outline. 

 Height, 2-5; leuf^th, 2-5. 



Localities. — Wanganui (u) ; alluvium at the mouth of River 

 Thames ; Opotiki, on a raised beach ; Cape Kidnappers ; Motanau (tj). 



16. M. elegans, sp. nov. ; ir. triangulare, Hector, Cat. Col. Mus., 

 not of Lamark nor H. triangida, Brocchi. Ovato-trigonal, small, rather 

 thin, rounded in front, produced and carinated behind, anterior and 

 posterior dorsal margins slightly arched ; cartilage plate small; pallial 

 sinus rounded ; concentrically striated, umbones smooth. Height, Q ; 

 length, -75. 



Localities. — Wanganui (u). 



THRACIA. 



17. T. granulosa, sp. nov. Elongate-oval, sub-equilateral, 

 rounded at both ends, rather thin ; pallial sinus shallow, rounded ; 

 concentrically striated, and covered with minute granules, irregularly 

 arranged. Height, I'l ; length, 1-75. 



Localities. — Wanganui (tj). 



MULINIA. 



18. M. notata, Hutton, Gat. Marine Moll., p. G4. 

 Localities. — Wanganui (u) ; Motanau (tj). 



Family — LuxRARirN^iE . 



LUTRARIA. 



19. L. SOlida, sp. nov.; Sector, Cat. Col. Mus., 1870,^. 179. 

 Elongate-oval, height more than half the length, thick, rounded at both 

 ends, posterior dorsal margin straight ; ventral margin convex ; irregu- 

 larly concentrically grooved ; cartilage pit broad, shallow. Height, 

 2-5; length, 4-5. 



Localities. — Lower Gorge of the Waipara. 



20. L. sulcata, sp. nov. Elongate-oval, height less than half the 

 length, posterior dorsal margin straight ; ventral margin slightly 

 convex ; distantly sub-concentrically grooved, the grooves shallower 

 and further apart towards the posterior end. Height, 9 ; length, 2 6. 



Localities. — Motanau (l) ; Awatere. 



ZENATIA. 



21. Z. acinaces, Quoi/,- Cat. Marine Moll, p. 64. 

 Localities. — Wanganui (u) ; Shakespeare Cliff ; Awamoa. 



