sion of it within the valve is thin nearly separated from it 

 at the base by a depression ; the transverse expansion of 

 the ligament is elongate and narrow ; the posterior muscular 

 scar is narrower than in the Australian species. 



These differences are quite constant in the twenty 

 examples of Parkinsonii and four oi Australia which have 

 been examined. 



Family Pectixid^e. 



Pectex Zelaxdi.'E. Tah. 3, fig. 7. 



Pecten Zelaudiffi, ff/w/, Bicffeiihach's Ncv) Zeal., p. 260. 



P. Zelandicus, {Gray) Von Marteris, List Moll. New Zml., 



50. 



Hab. Xew Zealand {Dr. Stangcr). Type figured. 



Family Ostreid.e. 

 OsTREA PiscoiDEA. Tab. 2, fig. in. 



Ostrea discoidea, Gould? Proc. Bo.ftmi Soc. N. II. III., 

 p. 347. 



Hab. New Zealand. 



The above figure is referred to this species with con- 

 siderable hesitation and doubt. 



Family Anomiid/E. 



Anomia (Placunanomia) Zelandica. Tah. ■i,.fig. 10. 



Anomia Zelandica, Gray, Dieffcnbach's N. Z. II., p. 260. 

 Hab. New Zealand {Br. Stangcr). Tj'pe figured. 



TJie figuie below fig. 9 represents the scar of the plug in 

 the lower valve. 



I am unable to refer fig. 9 to this or any other species. 



