294 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.37. 



Plate 27. 



Page. 



Fig. 1. Mesodesma donacium Lamarck, natural size 161 



2. Modiolus guyanensis Lamarck, natural size 152 



3. Tagelus {Mesopleura) dombei/i Lamarck, natural size 160 



4. Area {Scapharca) tuberculosa Sowerby, in profile, natural size 154 



Plate 28. 



Fig. 1. Pteria peruviana Reeve, h natural size 150 



2. Modiolus arciformis Dall, restored from fragments, length 65 mm . . . 152 



3. Tellina {Angulus) eburnea Hanley, natural size, view of interior of 



left valve 160 



4. Anomia peruviana Orbigny, natural size. Shell viewed from the base 



of attached valve 148 



5, 6. Aligena coleri Dall, umbonal view and profile, enlarged from 7.5 mm. 



long 155 



7. Donax aspera Hanley, natural size 159 



8. Diplodonta {Felaniella) arteinidls Dall, f natural size, length 12 mm, 156 



9. Tii^ela planulata Broderip and Sowerby, natural size 157 



10. Semele solida Gray, interior of left valve, natural size 160 



