^'■iS Cha'pnuiit ami Gabriel: 



Fig. 2. — G. t/iaccoi//\ Joliiiston sp. Form /> [ = Pectuuculus laficos- 

 fat us, McCoy, iion Q. and G.), with about 40 riblets. 

 Janjukian series. From McCoy's type locality. Bird 

 Rock Cliffs, Torquay. Coll. J. F. Bailey. Nat. size. 



3. — G. /naccoi/i, Johnston sp. Interior of valve showing^ 

 finely striated area. Janjukian series. Bird Rock, 

 Torquay. Geol. Surv. Vict. coll. Nat. size. 



4. — G. /naccoi/i, Johnston sp. Specimen with 29 riblets^ 

 Janjukian series. Tal)le Cape, Tasmania. Nat. size. 



5. — G. iiiaccoyi, Joliuston sp. Form r. with 30 riblets- 

 Kalimnan series. Macdonald's, Muddy Creek, Coll. F. 

 Chapman. Nat. size. 



Plate XXV. 



Fig. 6. — Gli/cimeris laficnstotus, Quoy and Gaimard sp. Living, 

 Coast of New Zealand. This species has about 40 rib- 

 lets. Interior of valve to show the comparatively 

 coarsely striate area. Nat. size. 

 7. — Trigonia lamarcki. Gray. Mallee Bore, No. 9, 315-325- 



feet. Nat. size. 

 8. — T. lamarcki, Gray. Living. Coast of New South Wales. 



For comparison with the above fossil. Nat. size. 

 9. — T. lamarcki, Graif. Costation of living specimen, mag- 

 nified, X 7. 

 10. — T. Itowifti. McCoy. Costation magnified for comparison 

 with the preceding figure. Cainozoic (Kalimnan 

 series). Macdonald's, Muddy Creek. Dennant coll. 

 X 7. 

 11. — T. rnargaritacea, Lamarck. Living example. Bass 

 Strait. Nat. size. 



Pl.vik XXVI. 



Fig 12. — Trigonia inargaritacta, vai'. aciifico^^tafa. McCoy, Co- 

 type of T. acuficosfafa, McCoy. Cainozoic (Kalimnan 

 series). Beaumaris. Port Philip. Nat. size. 

 13«, f>. — T. inargaritacfa, var. acuficosfafa, McCoy. Living 

 example (2 valves). Bass Strait. Pres. by Capt. Stan- 

 ley. Nat size. 

 14. — Euchelus haccafus, Menke sp. Oral aspect. Malice Bore. 

 No. 5, 175-189 feet. Nat. size. 



