3o6 



1818. Sangiiinolaria rugosa var. b Lamarck, Anim. sans Vertèb., V, p. 511. 



1835. Sangiiinolaria rugosa var. b Deshayes in Lamarck, Anim. sans Vertèb., VI, p. 170. 



1838. Sangiiinolaria dicliotoma Anton, Verzeichniss, p. 4. 



1840. Sangiiinolaria dichotoma Pfeiffer, Krit. Reg., p. 57. 



1853. Asapliis dichotoma Môrch, Cat. Yoldi, II, p. g. 



1856. Capsa defiorata Reeve (non Linn.), Concli Icon., p. X, Capsa^ pi. I, fig. \a and \f. 



1856. Asaphis dichotoma Adams, H. & A., Gen. Rec, MolL, II, p. 38g. 



1858. Asaphis Dichotoma Môrch, Journ. Conchyliol., VII, p. 138. 



1868. Asaphis arenosa Tryon, Amer. Journ. Conch., IV, p. 72. 



i86g. AsapJiis dichotoma Frauenfeld, Verhandl. Zool.-Bot. Ges. Wien, XIX, p. 880. 



1874. Asaphis dichotoma Dunker, Cat. Mus. Godeffroy, V, p. ôy. 



1880. Asaphis arenosa Bertin, Nouv. Archiv. Mus. d'Hist. Nat. Paris, (2) III, p. 80. 



1884. Asaphis dicliotoma Grasset, Ind. Test. Viv., p. 251. 



i8go. Asaphis dichotoma Paetel, Cat. Conch. Samm., III, p. 3g. 



i8go. Asaphis dichotoma Bôttger, O., Ber. Senckenberg., Nat. Ges., p. 271. 



i8g6. Asaphis dichotoma Casto de Elera, Cat. Sist. Filip., p. 718. 



i8g7. Asaphis rugosa var. dichotoma von Martens, in Weber's Ergeb. Reise Ost.-Ind., IV, 



Siiss.-Brackw. Moll., p. 253. 

 189g. Asaphis dichotoma Mellvill & Standen, Journ. Linn. Soc. London (Zool.), XXVIII, p. ig8. 

 1903. Asaphis deflorata Smith, Faun. Geogr. Maldive, Laccadive Archipel., II, p. 626. 

 ig03. Asaphis dichotoma Hidalgo, Obras Malacol., II, p. 74. 



igo5. Asaphis dichotoma Dautzenberg & Fischer, H., Journ. Conchyliol., LUI, p. 233. 

 igo5. Asaphis dichotoma Hidalgo, Cat. Filip. p. 306. 

 igo6. Asaphis dicliotoma Owston, Japan. Loochooan Shells, p. 40. 

 igog. Asaphis deflorata (ex parte, non Linn.) Lynge, D. Kgl. Dansk. Vidensk. Selsk. Skr. 



Nat.-Math. (7) V, p. 210. 

 igog. } Asaphis deflorata Lamy, Bull. Mus. d'Hist. Nat. Paris, XV, p. 469. 



ig25. Asaphis deflorata (ex parte), Oostingh, Geol. Comm. Agr. Univ. Wageningen N"g, p. 311. 

 ig28. Asaphis dichotoma Faustino, Summary Philippine Mar. Freshw. Moll., p. 100. 



I agfee with Morch and Bertin in considering" the A. dichotoma from the Indo-Pacific 

 as distinct from the A. deflorata (Linn.) from the West Indies. Von Martens considers the 

 former as a variety of the latter, and calls the Linnean species A. rugosa (Lam.), but I am of 

 opinion that the sculpture consisting of comparatively strongly but not uniformly developed 

 ribs, most of which divide into two or three ribs each from below the umbonal région, as 

 pointed out by Anton, is a very good differentiating character between the East and the West 

 Indian species. The shells collected by the "Siboga" Expédition are mostly of a uniform yellow 

 ochre colour, a few young shells show a brick red colour shining through the outer thin periostracum. 

 The nacre is shining white, with traces of yellow or orange and in ail cases with the posterior 

 margin of a dark violet colour. In young shells the dark violet band is not developed, and the 

 colour of thèse also varies from brick red to violet. 



Distribution : — A. dichotoma is widely distributed in the Indo-Pacific. 



The "Siboga" Expédition collected a good séries of shells of this species near the reef 

 of Urk Island, Kangeang Group (St. 14), Bay of Labuan Tring, west coast of Lombok (St. 19), 

 Anchorage off Pulu Kawassang, Paternoster Islands (St. 40), Kambaragi Bay, Tanah Djampeah 

 (St. 64) and .'\nchorage off Dongala, Palos Bay, Celebes (St. 86). 



