132 



(genus Elizia, Gray) is another orbicular form from Sumatra, and an in- 

 termediate form is presented in S. nitida from New Zealand. In all these 

 the fulcrum callosity of the hinge is more or less conspicuously developed. 

 Another peculiarity of the genus not unworthy of note is that the pos- 

 terior side is generally painted with two faint rays. 



1. acuminata, Desk. 



2. Adainsii, id. 



3. atrata, id. 



4. biradiata, Wood. 



5. consobrina, Desk. 



6. Cumingiana, id. 



7. diphos, linn. 



Species. 



8. Donacioides, Reeve. 15. 



9. epidermia, Desk. 16. 



10. incerta, id. 17. 



11. Japonica, id. 18. 



12. nitida, Gray. 19. 



13. Nuttallii, Conr. 20. 



14. nymphalis, Desk. 21. 



orbiculata, Wood. 

 obscurata, Desk. 

 planulata, Reeve. 

 reversa, id. 

 siliqua, id. 

 truncata, id. 

 tumens, id. 



Figure. 

 (For figure, see Conch. Icon. vol. x.) 



Genus 12. SANGUINOLARIA, Lamarck. 



Animal; mantle freely open and fringed at the edges; siphons 



long and widely separated ; foot compressly linguiform. 

 Shell ; transversely ovate, rather convex, thin, subtransparent, 

 moderately inequilateral, finely concentrically striated, more or 

 less tinged with blood-rose, anterior side rounded, posterior 

 attenuated ; hinge composed of two small approximating erect 

 bifid teeth in each valve. 



The Lamarckian genus Sanguinolaria has been dismembered of all its 

 species excepting the beautiful and very delicate Tellen form, known as S. 

 sanguinolenta (S. rosea, Lam., Solen sanguinolentus, Gmelin). To this 

 type have been added four newly-described species of similar character, and 

 a very natural group is the result. The shell is of transparent delicacy, 

 finely concentrically striated, sometimes white, but mostly tinged more or 

 less with deep blood-rose. On the anterior side it is rounded, on the pos- 

 terior attenuated, with a faint depression radiating from the umbo. The 

 hinge, in addition to the small cardinal teeth which characterize the Tellens 

 generally, has still the fulcrum callosity of Soletellina in a rudimentary form. 



