230 Mr. E. A. Smith 07i the Genus Pythina. 



It seems to me likely that an oblique scar across the interior 

 of the valves, such as we find in many species of Lucinidas, 

 may have deceived them. 



At present the systematic position of Mylitta is doubtful ; 

 but considering the character of the exterior I am inclined to 

 locate it provisionally in the above-named family. 



3. Pythina tasmanica, Tenison-Woodg. 



Pythina tasmanica, Tenison-Woods, Proc. R. Soc, Tasman. 1875, p. 162 ; 

 Tate, Trans, R. Soc. S. Austral, vol. ix. p. 98, pi. v. fig. 12. 



Hob. King's Island, N.W. of Tasmania, 

 This species is identical with the preceding, as indicated 

 in the synonymy. 



4. Pijthma Stowei, Hutton. (PI. XIII. A. figs. D, E, F.) 



1873. Pythina Stowei, llutton, Cat. Mar, Moll. New Zeal. p. 7G, 

 1880. Pythina Stoioei, id. Manual N. Z. Moll. p. 157. 



Hah. Islet Reef, Cook Strait, New Zealand (Hutton), New 

 Zealand {Dr. Sinclair, in Brit. Mus. 185G). 



This is a larger and narrower shell than Mylitta Deshayesii, 

 but agrees with it as regards the hinge. It is ornamented 

 with strong divaricate plicee, the entire surface being minutely 

 shagreened or punctate. 



5. Pythina paula, A. Adams. 



Pythina paula, A. Adams, Proc. Zool. Soc. 1856, p. 47. 

 Montacuta paula, Smith, Report ' Cliallenger ' Lamellib. p. 203, pi. xii. 

 figs. 1-1 b. 



Hah. Eaine Island, Torres Straits {A. Adams), south of 

 New Guinea (' Challenger ') . 



This species has neither the dentition nor sculpture of 

 Pythina, but agrees in both respects with Tellimya. I pre- 

 sume it was placed in Pythina mainly from its resemblance 

 in form to the type of that genus and to the fossil Modiola 

 arcuata, Lamk., referred to that genus by Hinds himself. 



6. Pythina peculiaris, A. Adams. 

 Pythina peculiaris, A. Adams, Proc. Zool. Soc. 1856, p, 47. 

 Hah. Ceylon. 



This so-called species, based on a single specimen in 

 Cuming's collection, I regard as a mere distortion of P. paula. 



