STANTON I THE MARINE CRETACEOUS INVERTEBRATES. 



EXPLANATION OF PLATE IV. 



PAGE 



PECTEN (CAMPTONECTES) PDEYRRYDONENSIS Stanton . . . . . 12 



Fig. i. Right valve. Natural size. 

 PECTEN OCTOPLICATUS Stanton ......... 14 



Fig. 2. Right valve with the ears partly restored from another example. 

 Enlarged two diameters. 



Fig. 3. Left valve, similarly enlarged. 

 MYTILUS ARGENTINUS Stanton ......... 16 



Fig. 4. Right valve. Enlarged two diameters. 

 PECTEN ARGENTINUS Stanton . . . . . . . . 13 



Fig. 5. Left valve. Natural size. 

 AVICULA (OXYTOMA) TARDENSIS Stanton ..... . 14 



Fig. 6. A small left valve enlarged three diameters to show details of 

 sculpture. From a wax cast of a natural mold. 



Fig. 7. An average left valve, natural size, with most of the shell and 



posterior ear removed. 

 NUCULA PUEYRRYDONENSIS Stanton ........ 17 



Fig. 8. A small left valve from a wax cast of a natural mold. 



Fig. 9. Another left valve. 

 SOLECURTUS? LIMATUS Stanton 24 



Fig. 10. Left valve. 

 LEDA? CORBULIFORMIS Stanton ......... 18 



Fig. 1 1 . Left valve. 

 TAPES? PATAGONICA Stanton ......... 23 



Fig. 12. Dorsal view of type, enlarged two diameters. 



Fig. 13. Left valve of same. 



CORBULA CRASSATELLOIDES Stanton ........ 26 



Fig. 14. Right valve, enlarged three diameters. 



Fig. 15. Left valve, enlarged three diameters. 

 TRIGONIA HETEROSCULPTA Stanton 20 



Fig. 1 6. Young specimen showing concentric sculpture of beak and 

 beginning of posterior series of costse. 



Fig. 17. Half-grown specimen showing further development of costae. 



Fig. 1 8. Larger specimen with anterior sculpture obscured by weathering. 

 TRIGONIA SUBVENTRICOSA Stanton ........ 18 



Fig. 1 9. Dorsal view of the type. 



Fig. 20. Left valve of same. 

 All figures of natural size unless otherwise stated. 



(VOL. iv) 



