406 Annals of the South African Museum. 



FIG. 



10. Nuculites martialis, Eeed. Internal cast of shell ; right valve. Nat. size. 



Zwartberg Pass. 



11. N II culana viator ST^. noY. Internal cast of shell; left valve, x 2. Zwartbei'g 



Pass. 

 11((. Ditto. Cardinal view of same specimen, x 2. 



12. Niiculana agrestis s]).nov. Internal cast of shell ; left valve, x 2. Zwartberg 



Pass. 

 12rt. Ditto. Cardinal view of same specimen, x 2. 



13. Nucitla nigella sp. nov. Internal cast of shell ; left valve. Nat. size. 



Zwartberg Pass. 

 13rt. Ditto. Cardinal view of same specimen, x IJ. 



14. Lejitodomus ? fontinalis s^i. noY. Internal cast. (No. 21, Geol. Siirv.) Nat. 



size. Ezelfontein. 

 14a. Ditto. Cardinal view of same specimen. Nat. size. 



Plate XLVIII. 



FIG. 



1. Solenopsis? boMeveldensis ST^. nov. Complete shell, x 1|. Zwartberg Pass. 



2. Grammysia montana sp. nov. Left valve, x IJ. Zwartberg Pass. 



3. Actinopteria aff. Immholdti Clarke. Left valve. (No. 14, Geol. Surv.) x 1^. 



Gydo Pass. 



4. Spirifer sp. Brachial valve. (No. 35, Geol. Surv.) Nat. size. Slangfontein. 



5. Rensselceria montaguensis sp. nov. Lateral view of internal cast of shell. 



Nat. size. Montagu. 

 5a. Ditto. Umbonal portion of same specimen from brachial side. Nat. size. 



6. Ditto. Posterior marginal view of umbonal region of another specimen. 



x IJ. Same locality. 



7. Ditto. Internal cast of shell, showing shape and ribbing. (Mr. Henkel's.) 



Nat. size. Same locality. 



8. Remsehcria cf. cayuga, Clarke. External impression of crushed rachial 



valve. (No. 602, Mus. Cat.) Nat. size. Uitenhage. 



9. Scaphioccelia ? africana Eeed. Complete internal cast of undistorted hell. 



Nat. size. Montagu. 



10. Scaphioccelia ? africana var. nov. elizahetlKC. Internal cast of umbona 



portion of both valves. Nat. size. Eiet Kuil. 



11. Ditto. Posterior view of internal cast of umbonal portion of pedicle- valve. 



Nat. size. Same locality. 



12. Ditto. Lateral view of internal cast of nmbonal portion of pedicle-valve of 



another specimen. Nat. size. Same locality. 



13. Ditto. Anterior view of internal cast of umbonal region of brachial valve. 



Nat. size. Same locality. 



14. Ditto. Ditto. Another specimen. Same locality. 



Reference letters. 



d., diductor muscles. 

 a., adductor muscles, 

 c, bases of crura. 

 d.p., dental plates. 

 d.s., dental sockets. 

 g., groove dividing hinge-plate. 

 p.d. internally thickened pseudo-deltidium. 

 m. r. , median ridge. 



p.a., pits in anterior face of hinge-plate, formed by adductor muscles. 

 Ill .s., median septum in brachial valve. 



