54 



1890. Barbatia sculptilis and B. Zebiiensis Paetel, Cat. Conch. Samm., III, p. 214. 



1891. Arca [Acar] sculptilis Kobelt in Martini, Chemn. Conch. -Cab., (N. F.), VIII (2), p. 193, 

 , pi. XLVI, fig. 14. 



1907. Arca [Fossularca] afra var. solida Lamy, (ex parte), Journ. Conchyliol., LV, p. 100. 

 1909. Arca {Fossularca) sculptilis Lynge, D. Kgl. Dansk. Vidensk. Selsk. Skr. Nat.-Math., (7) 



V, p. 115. 

 1929. Arca [Fossularca) afra Dautzenberg (ex parte), Faun. Colon. Français., III, Fasc. IV, 



P- 577- 



I agrée with Lynge that A. {F.) sculptilis is distinct from A. afra var. solida with 

 which Lamy had united it, and that A. zebuensis Reeve is a synonym of this species. 



Reeve's description of the species is very poor, but his figure accurately represents the 

 form and outline of the shells, Smith published a detailed description of A. (/^.) sculptilis in 

 his account of the "Challenger" Lamellibranchia and Lynge added notes on the synonymy and 

 colour of the shells of this species. 



Distribution : — A. {F.) sculptilis has been recorded from Karachi, Bombay, India ; Gulf 

 of Siam, Amboina, the Philippines and Torres Straits. 



In the "Siboga" collections the species is represented by two shells taken off Laiwui 

 (St. 142) and Ambon (St. 231). 



2. Arca {Fossularca) syniinetrica Reeve. 



1844. Arca symmetrica Reeve, Conch. Icon., Il, Arca, pi. XVII, fig. 120. 



1844. Arca symmetrica Reeve, Proc. Zool. Soc. London, p. 127. 



1848. Arca symmetrica Nyst, Mém. Acad. Roy. Belgique, XXII, p. 70. 



1884. Arca [Barbatia) symmetrica Smith, Rep. Voy. "Alert", p. iii. 



1886. Arca symmetrica von Martens, Journ. Linn. Soc. London (Zool.), XXI, p. 207. 



1889. Arca [Barbatia) symmetrica Kobelt in Martini Chemn. Conch-Cab. (N. F.), VIII (2), Arca, 



p. 94, pi. XXV, figs. 7, 8. 



1890. Barbatia symmetrica Paetel, Cat. Conch. Samm., III, p. 214. 

 1907. Arca sytmnetrica Lamy, Journ. Conchyliol., LV, p. 104. 



As has been pointed out already (supra p. 96) Reeve mixed up the numbers of the 

 figures of A. syiujnetrica and A. zeèttensis. Smith, from an examination of the types in the 

 Cuming collection was able to correct this mistake, but his conclusion of A. zebuensis being a 

 variety of A. (F.) symmetrica is not justifiable. 



This species is distinguished from A. zebuensis — which, as was pointed out by Lynge ^), 

 is a synonym of A. sculptilis and not A. afra as suggested by Lamy (op. cit., p. 100) — 

 by the anterior and posterior sides of the shell being of about the same size, the posterior side 

 not so oblique as in the latter species and the sculpture îess strongly developed. 



Distribution : — A. (F.) symmetrica was hitherto known from the Bay of Manilla, the 

 Philippines, Singapore and Port Molle, Queensland. 



In the "Siboga" collection the species is represented by a single right valve from the 

 Bay of Bima (St. 47), a left valve from the Tuai Anchorage, Kei Islands (St. 258) and a complète 

 shell from Sapeh Bay, east Coast of Sumbawa (St. 311). 



i) Lynge, H. — D. Kgl. Dansk. Vidensk. Selsk. Skr. Nat.-Math., f;) V, pp. 115. 116 (1909). 



