EXPLANATION OF PLATE 7 



Fig. 1. Dosinia mathewsonii Gabb. No. 11145, Coll. Invert. Palae. Univ. 

 Calif., loc. 1131. Natural size. 



Fig. 2. Dosinia mathewsonii Gabb. Same specimen as fig. 1, showing dorsal 

 view. Natural size. 



Fig. 3. Dosinia (Docinidia) whitneyii Gabb. No. 11146, Coll. Invert. Palae. 

 Univ. Calif., loc. 14. Natural size. 



Fig. 4. Dosinia (Docinidia) whitneyii Gabb. Same specimen as fig. 3, show- 

 ing dorsal view. Natural size. 



Fig. 5. Dosinia mathewsoni Gabb. No. 11149, Coll. Invert. Palae. Univ. 

 Calif., loc. 1131. Hinge of right valve, natural size. 



Fig. 6. Dosinia mathewsonii Gabb. No. 11148, Coll. Invert. Palae. Univ. 

 Calif., loc. 1131. Hinge of left valve, natural size. 



Fig. 7. Area (Scapharca) mediaimpressa, n. sp. No. 11172, Coll. Invert. 

 Palae. Univ. Calif., loc. 1131. Natural size — a rather large specimen for this 

 species. 



Fig. 8. Area (Scapharca) mediaimpressa, n. sp. An anterior view of the 

 same specimen as fig. 7. 



Fig. 9. Dosinia mathewsonii Gabb. No. 11173, Coll. Invert. Palae. Univ. 

 Calif., loc. 1131. Natural size. 



Fig. 10. Glycvtneris huwaldi, n. sp. Type, no. 11150, Coll. Invert. Palae. 

 Univ. Calif., loc. 1131. Approximately twice natural size. 



Fig. 11. Glyrimeris huwaldi, n. sp. Same specimen as fig. 10, exterior view. 

 Approximately twice natural size. 



[ 200 ] 



