Thomson. — Fossils from Kakanui. 103 



spaces ; lunule small, cordate ; umbones recurved. Height, 

 | in. ; length, | in. 



This species differs from C. australis, Quoy, as described 

 by Hutton* as Venericardia australis, in having always more 

 than 22 ribs. It would, however, be included under the more 

 general description of the same species by G. F. Harris. f He, 

 however, admits several of Tate's Australian species, which 

 do not differ more from G. australis than does this variety ; 

 hence the foundation of a new species for the purposes of com- 

 parison with Australian Tertiary shells is justified. Of these, 

 C. benhami resembles most C. delicatula, Tate, and C. granuli- 

 costata, Tate. 



The only locality observed was in the fossiliferous layers 

 of the tuff underlying the limestone on the cliffs, North Shore, 

 Kakanui. It is here, however, fairly abundant. 



Gasteropoda. 

 Turbo marshalli, nov. sp. Plate XIV, fig. 6. 



Shell turbinate-conical, imperforate ; spire depressed, whorls 

 5-6, convex, acutely keeled ; 2 keels on the body-whorl ; orna- 

 mentation ; tubercles on the keel, about 13 to a whorl, but none 

 on the second keel on body- whorl ; between keels and upper 

 suture of each whorl are spiral granulose lineations, absent 

 between the keels and the lower suture. Aperture subcircular, 

 entire ; outer margin thin. Operculum elliptical. 



This species has the same occurrence as the last. It re- 

 sembles no other known New Zealand Turbo. 



EXPLANATION OF PLATE XIV. 



Fig. 1. Isis hamiltoni ; natural size. 

 Fig. 2. Terebratula gravida ; natural size. 

 Fig. 3. Magellania sinuata ; natural size. 

 •Fig. 4. TerebratdLa kakanuiensis ; x 3. 

 Fig. 5. Terebratulina suessi ; X 4. a, b, two extreme varieties ; c, interior 



of dorsal valve, showing arm-loop. 

 Fig. 6. Turbo marshalli ; natural size, a, Turbo marshalli ; b, side view 



of operculum ; c, face of operculum. 



* Cat. Tert. Moll. N.Z. 



t Cat. Tert. Moll. Brit. Mus., 1897, part i, Australasia. 





