Mr. E. A. Smith on the Genus Pythiua. 231 



7. Pythina arcuata^ A. Adams. 



Pythina areuata, A. Adams, Proe. Zool. Soc. 1856, p. 47. 



Hob. Zebu, Philippines. 



This also, like the two preceding species, has the dentition 

 of Tellimyay and should be referred to that group. 



8. Pythina triangularis y A. Adams. 



Pythina triangularis, A. Adams, Proc. Zool. Soc. 1856, p. 47, = Mactra 

 nucleus (Conrad ?), Reeve, Conch. Icon. 1854, fig. 102. 



Hah. Manilla (A. Adams). 



This small, almost equilaterally triangular species also has 

 the dentition of Tellimya, agreeing in this particular precisely 

 with the type, T. bidentata. 



9. '■''Pythina areuata^ Lamarck," Hinds *. 



Modiola areuata^ Lamarck, figured by Deshayes (Coq. foss. 

 Environs Paris, vol. i. pi. xl. figs. 4, 5, 6) , is stated by Hinds 

 to belong to Pythina. It forms the type of the genua 

 Hindsia of Desliayes, which was afterwards modified, on 

 account of its preoccupation, to Hindsiella by Stoliczka. It 

 possibly may be a species of Montacuta or Tellimya^ as it 

 appears to be in external appearance very closely allied ta 

 T. paula (A. Adams). 



10. Pythina mactroides, Hanley. 

 Pythina mactroides, Hanley, Proc. Zool. Soc, 1856, p. 340. 



Hah. Cape of Good Hope. 



This little species is undoubtedly a Kellia both as regards 

 the hinge and the smooth surface of the valves. I presume 

 that Hanley was led to place it in the genus Pythina on 

 account of the straight or even incurved ventral margin, 

 which recalls the form of the type, P. Deshayesiana. 



11. Pythina nuculoideSj Hanley. 

 Pythina nuculoides, Hanley, Proc. Zool. Soc. 1856, p. 341. 



Hah. Society Islands. 



This species, which is synonymous with Erycina deaticu- 

 lata, Deshayes (Proc. Zool. Soc. 1855, p. 182), is in every 

 respect a typical Kellia. 



* This species is referred to merely on account of its having been 

 quoted by Hinds as belonging to Pythina. Four other fossil species are 

 placed in this group by Cossmaun in his Cat. illustr. Coq. foss. Eocene 

 Envir. Paiis, 1887. 



