PLATE XXII. 



Spondtlus {continued). 



Figs. 



1—10. S. latus (Sowerby). (P. 121.) 



1. Woodwardian Museum. The type of S. ssquicostatus, Eth. Zone of Holaster 



suhglobosus, Cherry Hinton. 1 a, left valve ; 1 h, posterior view of the same. 



2. Same collection, horizon, and locality, a, left valve ; h, portion of same just 



ventral to centre of valve, x 4. 



3. Woodwardian Museum. Lower Chalk, Fulbourn. Left valve. 



4 — 9. Dr. Blackmore's Collection. Zone of A. qziadratus. 4 — 8, East Harnham ; 

 9, West Harnham, near Salisbury. 



4. a, left valve, with part of right projecting ; b, posterior view of both valves. 



5. Eight valve. 



6. Left valve. Part near the umbo x 2. 



7. Left valve x Ih 



8. Left valve, a, x 1| ; t, posterior outline ; c, ornamentation x 5. 



9. Left valve, with umbo and marginal parts of right valve X l^. 



10. Woodwardian Museum (Coll. Mr. W. Hill). Zone of H. subglohosus, cutting 



east of South Cave Station, Yorkshii-e. a, left valve; b, ornamentation x 4. 



11 — 14. 8. Biitempleanus, d'Orb. Zone of A. qnadratus. Dr. Blackmore's 

 Collection. 11 — 13, Bast Harnham. 14, Whacldon cutting. (P. 125.) 



11. o, left valve X 1| ; &, ornamentation x 4. 



12. a, left valve ; b, ornamentation X 3. 



13. Posterior view of both valves. 



14. Eisjht valve. 



