611 



The anterior side is short and narrow. The shell differs from 

 M. excavata, Hanley, in the squareness of the posterior side, and 

 the length and elevation of the posterior dorsal edge. The ventral 

 edge is not so much bulged. Mus. Cuming and SowerLi/. 



7. Merge Solandri (pi. cxxvi. f. 10), Grai/, Ann. Phil. 

 IFood, Suppl. pi. 2. f. 11. 



M. testa laevigata, tumida, subsequilaterali, subovali; margine 

 ventrali rotundato ; colore albo, maculis fasciisque fuscis angulatim 

 scripto. 



Shell smooth, tumid, and more oval than any of the rest ; and 

 nearly equilateral. 



Cliina. 



LIST OP FIGURES IN PLATE CXXVI. 



Fig. 1, 3. M. picta, Sp. 1. 

 3-8. — scripta, 4. 

 9. — subquadrata, 6. 

 10. — Solandri, 7. 

 11, 12. — eftossa, 2. 

 13, 14. — excavata, 5. 

 15. — serainuda, 3. 



MONOGRAPH OF THE GENUS 



CYTHERiEA. 



Fam. Veneridse. 



Char. Gen. Testa sequivalvis, insequilatera, plerumque ovalis; 

 impressionibus muscularibus duabus, subreniformibus ; pallii 

 impressione plerumque postice plus minus sinuata; ligamento 

 externo; lunula plerumque impressa; cardine dentibus duobus 



