322 



Measurements of Holotype : — Length 15.2 mm., height 12 mm., diameter 3.3 mm. 



Habitat : — A complète shell and a flat upper valve were brought up in a deep-sea 

 trawl at St. 212 (5°54'.5S., i2o°i9'.2E., 462 mètres). 



Remarks : — M. weberi is closely allied to M. quadrata Smith ^) from the Arabian Sea, 

 but its shell is more elongate, the posterior dorsal slope and ventral margin are much more 

 curved and the sculpture on the shells of the two species is quite différent. 



2. Myadora sp. (Plate VII, figs. 13, 14). 



A single flat upper valve of a species of Myadora brought up in a deep-sea trawl at 

 St. 256 (5° 26'. 6 S., i32°32'.5E., 397 mètres) probably represents an undescribed species, but 

 with a single valve I do not feel disposed to describe the species. 



The valve, which I figure, is comparatively deeper than that of M. weberi and has the 

 sculpture more strongly developed ; its posterior dorsal slope is not so incurved. 



Family Calopodiidae. 

 Genus Calopodium Roding. 



1798. Calopodium. Roding, Mus. Boltenianum, p. 166. 



1799. Pandora Lamarck, Mem. Soc. Hist. Nat. Paris, p. 88. 

 1856. Pandora Adams, H. & A., Gen. Rec. MolL, II, p.* 370. 

 1887. Pandora Fischer, P., Man. ConchylioL, p. 1158. 



1903. Pandora Dali, Trans. Wagner Free Inst. Sci. Philadelphia, III, p. 15 15. 



The generic name Pandora in strictly binomial sensé was used by Lamarck in 1799, 

 and its earlier usage by Hwass in Chemnitz 1795 is not admissible. In 1798, however the name 

 Calopodium was introduced by Roding and this has precedence over Pandora Lamarck ; the family 

 name must also be changed to Calopodiidae. The génotype is Calopoditcm inaequivalvis (Linn.). 



In the "Siboga" collection there are représentatives of two subgenera, Coelodon Carpenter^) 

 — type C. (C) ceylanicus (Sowerby) and Kennerlia Carpenter ^) — type C. [K^filosus Carpenter. 



I. Calopodittm [Coelodon^ elongatum (Carpenter). 



1864. Coelodon elongatus Carpenter, Proc. Zool. Soc. London, p. 600. 



1868. Coelodon elongatus Carpenter, Amer. Journ. Conch., IV, p. 70. 



1874. Pandora elongata Sowerby in Reeve, Conch. Icon., XIX, Pandora, pi. i, fig. 4. 



1885. Coelodon elongatus Smith, "Challenger" Lamellibranchia, p. 62. 



1890. Pandora elongata Paetel, Cat. Conch. Samm., III, p. 29. 



1906. Coelodon elongatus Hedley, Proc. Linn. Soc. N. S. Wales, XXXI, p. 473. 



1909. Coelodon elongatus Lynge, D. Kgl. Dansk. Vidensk. Selsk. Skr. Nat. -Math., (7), V, p. 287. 



191 1. Pandora elongata Pelseneer, "Siboga" Lamellibranches (Anat.), p. 73, pi. XXIV, fig. 7. 



The "Siboga" shells, which I assign to this species are more incurved along their dorsal line 

 than some spécimens of C. (C) elongatum from Bornéo coast in the British Muséum. The anterior 



i) Smith, E. A. — Ann. Mag. Nat. Hist., (7) IV, p. 250 (1899), and Illustr. Zool. "Investigator", fig. 5, 5« (1901). 



2) Carpenter, P. P. — Proc. Zool. Soc. London, p. 599 (1864). 



3) id., ibid., p. 602 (1864). 



