294 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. 37. 
PLATE 27. 
Page. 
Fia. 1. Mesodesma donacium Lamarck, natural size...........-.---------- 161 
2. Modiolus guyanensis Lamarck, natural size.........--..---------- a a 
3. Tagelus (Mesopleura) dombeyi Lamarck, natural size.......-..----- 160 
4. Arca (Scapharca) tuberculosa Sowerby, in profile, natural size...... 154 
PLATE 28. 
Bie. 9d. 'Pteria peruviaona Reeve; > naturalisizes=ee- eee eee — ae eee ee eee 150 
2. Modiolus arciformis Dall, restored from fragments, length 65mm... 152 
3. Tellina (Angulus) eburnea Hanley, natural size, view of interior of 
left valve. 2: 2a oe Ree eae Be yeep arpa a ate ae epg 160 
4, Anomia peruviana Orbigny, natural size. Shell viewed from the base 
of attached valve:z. ose cue cece eee See ee ee ee ee eee eee 148 
5, 6. Aligena cokeri Dall, umbonal view and profile, enlarged from 7.5 mm. 
Oye ee een Sune Aa GoOmoM boOukoEabeODOLbOS 155 
Te Donaa aspera: Elanley, naturalisizee ces eee eee eee eee eee eee 159 
8. Diplodonta ( Felaniella) artemidis Dall, ? natural size, length 12mm. 156 
9. Tivela planulata Broderip and Sowerby, natural size.....-.-.------ 157 
10. Semele solida Gray, interior of left valve, natural size......-...-..-- 160 
