145 



2. Cardita [Arcinelld] pica Reeve. 



1843. Cardita pica Reeve, Conch. Icon., I, Cardita, pi. II, figs. 8«, b. 



1844. Cardita pica Reeve, Proc. Zool. Soc. London (vol. for 1843), p. 191. 



1854. Cardita Essingtonensis and C. luiibilicata Deshayes, Proc. Zool. Soc. London (vol. for 

 1852), p. 100. 



1856. Cardita pica Hanley, Rec. Biv. Shells, p. 368, pi. XVIII, fig. 11. 



1857. Mytilicardia Essingtonensis, M. pica and M. niiibilicata Adams, H. & A., Gen. Rec. Moll., 



II, p. 488. 

 1869. Cardita pica Lischke, Japan. Meeresconch., I. p. 145. 

 1882. Mytilicardia pica Dunker, Ind. Moll. Mar. Japon., p. 221. 

 1888. Cardita unibilicata, C. pica and C. Essingtonensis Clessin in Martini-Chemn. Conch. -Cab. 



(N. F.) X (i), Carditacea, pp. 22, 39, pi. VIII, figs. 13, 14, pi. XI, figs. 11, 12. 

 1890. Cardita unibilicata, Mytilicardia Essingtonensis and Lazaria pica Paetel, Cat. Conch. 



Samm., III, pp. 141, 142. 

 1922. Cardita pica Lamy, Journ. Conchyliol., LXVI, p. 234. 

 1928. Cardita pica Faustino, Summary Phillippine Mar. Freshw. Moll., p. 50. 



I agrée with Lamy that both Cardita essingtonensis Deshayes and C. uinbilicata Deshayes 

 are synonyms of C. {A.) pica Reeve. The distinguishing characters of the species are well defined 

 by Reeve, and the figures in "Conch. Icon." and Hanley's "Rec. Biv. Shells" make it quite 

 easy to distinguish the species. 



Distribution : — C. [A.) pica has been recorded from the Pacific Océan from Japan to 

 the PhiHppines. 



The "Siboga" Expédition collected two shells in the Bay of Bima (St. 47) and on the 

 reef on the east side of Pajunga Island, Kwandang Bay (St. 115). 



3. Cardita {Arcinelld) aviculana Lam., var. excavata Deshayes. 



1854. Cardita excavata Deshayes, Proc. Zool. Soc. London, (vol. for 1852), p. lOO, pi. XVII, figs. 1-3. 



1857. Mytilicardia excavata Adams, H. & A., Gen. Rec. Moll., II, p. 488.- 



1860. Cardita excavata Reeve, Elein. Conch., II, p. 100. 



1867. Mytilicardia excavata Angas, Proc. Zool. Soc. London, p. 928. 



1878. Mytilicardia excavata Hutton, Journ. Conchyliol., XXVI, p. 52. 



1885. Cardita excavata Smith, "Challenger" Lamellibranchia, p. 210. 



1888. Cardita excavata Clessin, in Martini-Chemn. Conch. -Cab. (N. F.), X (i), Carditacea, p. 21. 



1890. Mytilicardia excavata Paetel, Cat. Conch. Samm., III, p. 142. 



1894. Mytilicardia excavata Henn, Proc. Linn. Soc. N. S. Wales, (2) IX, p, 180. 



1922. Cardita aviculana var. excavata, Lamy, Journ. Conchyliol., LXVI, p. 230. 



Smith was certainly mistaken in suggesting that C. essingtonensis Deshayes, C. umbilicata 

 Deshayes and C. pica Reeve are allied to C. excavata Deshayes, and "will eventually prove 

 to be variations of the same shell". Suter ^) considers C. excavata to be a synonym of C. caly- 

 culata (Linn.), but I agrée with Lamy that it is a variety of C. [A.) avicîilana Lam. This 

 variety is distinguished by its very inequilateral shell, with a very short and subtruncate anterior 

 margin, the shell broader in the posterior half and ornamented with scaly ridges. 



Distribution : ■ — C. [A,) aviculana var. excavata has so far been recorded from the 

 Pacific Océan, near the coasts of Australia and New Zealand. 



In the "Siboga" collection there is a single young shell dredged at St. 164 (i°42^5 S., 

 130° 57^5 E., 32 mètres), which I refer to this variety. 



i) Suter, H. — Man. New Zealand Moll., p. 903 (1913). 



SIBOGA-EXPEDITIE LIIIiT. 19 



