1867. Galeouima avibigua Mitchell, Cat. Mus. Madras, p. 63. 



1874. Scintilla ambigua Sowerby, Conch. Icon., XIX, Scintilla, p. III, figs. 19a — d. 



1884. Scintilla ambigua Grasset, Ind. Test. Viv., p. 281. 



1890. Scintilla auibigîia Paetel, Cat. Conch. Samm., III, p. 134. 

 1905. Galeomma ambigua Hidalgo, Cat. Filip., p. 358. 



1928. Galeomma ambigua Faustino, Summary Philippine Mar. Freshw. MolL, p. 59. 



Scintilla ambigua is closely allied to S. faèa, but the shell is narrower and more elongated. 

 Distribution : — S. ambigua hàs so far been recorded from the Philippines only. 

 In the "Siboga" collection there is a shell collected at Ambon Anchorage (St. 231), 

 which agrées very well with the type of the species in the British Muséum (Nat. Hist.), London. 



5. Scintilla sp. 



I hâve not been able to identify specifically a number of spécimens of a Scintilla from 

 Macassar (St. 71), Kwandang Bay entrance (St. 115), Anchorage off Beo, Karakelang Islands 

 (St. 131) and Saleyer (St. 213). Thèse shells vary in outline from subquadrate to circular, and 

 appear to be intermediate between S. timorensis Deshayes and S. cnvieri Deshayes ^). 



Genus Pythina Hinds. 



1845. Pythina Hinds, Zool. Voy. "Sulphur", II, p. 70. 

 1857. Pythina Adams, H. & A., Gen. Rec. Moll., II, p. 475. 

 1887. Pythina Fischer, Man. Conchyliol., p. 1027. 



1891. Pythina Smith, Ann. Mag. Nat. Hist., (6) VIII, p. 227. 



1900. Bornia (ex parte) Dali, Trans. Wagner Free Inst. Sci. Philadelphia, III, pp. 1 147, 1 148. 



Smith from his studies of the hinge and shells of the génotype of Pythina concluded 

 that "the so-called genus Pythina differs from Kellia only in having the surface ornamented 

 with divaricating plicae, a feature in my judgement, only of spécifie value". Pelseneer ^) from 

 his studies of the animal came to the conclusion that Pythina differs materially from Kellia and 

 the Lasaeidae, and should be placed with Scintilla^ Galeomma^ Ephippodonta and Chlamydo- 

 concha in the family Galeommatidae. 



I. Pythina deshayesiana Hinds. (Plate, V, figs. 24, 25). 



1845. Pythina deshayesiana Hinds, Zool. Voy. "Sulphur", II, p. 70, pi. XIX, figs. 8, 9. 



1852. Pythina Deshayesiana Sowerby, Conch. Man., pp. 261, 336, pi. XXVII, fig. 571. 



1857. Pythina Deshayesiana Adams, H. & A., Gen. Rec. Moll., II, p. 476, pi. CXI V, figs. 9, 9(7. 



1862. Pythina Deshayesiana Chenu, Man. Conchyliol., II, p. 126, fig. 603. 



1878. Pythina Deshayesiana Kobelt, Illustr. Conchylienbuch, p. 352, pi. CIII, fig. 8. 



1880. Kellia [Pythina) Deshayesiana Woodvvard, Man. Conch., (éd. IV), p. 459. 



1884. Kellia [Pythina) Deshayesiana Tryon, Struct. Syst. Conch., III, p. 221, pi. CX, fig. 96. 



1885. Pythina deshayesiana Smith, "Challenger" Lamellibranchia, p. 204. 

 1887. Pythina Deshayesiana Fischer, P., Man. Conchyliol., p. 1027. 

 1890. Pythina Deshayesiana Paetel, Cat. Conch. Samm., III, p. 132. 



i) Deshayes, G. P. — Proc. Zool. Soc. London (volume for 1855), p. 174 (1856) and Sowerby, G. B, in Reeve, Conch. Icon., 

 XIX, Scintilla^ pi. II, figs. 15, 1 6 (1874). 



2) Pelseneer, P. — ".Siboga" Lamellibranches (Anat.), pp. 43, 45 (191 1). 



