25 121 



they are deeper only at the place where the keel is situated exteriorly; the margin 

 is crenulated. 



Long. 12 mm., alt. 9 mm. 



West of Koh Kill, 30 fathoms, sand and mud. 



This pretty little, characteristic species, of which unfortunately only a single 

 left valve is at hand, has certainly been provided with an epidermis, but no trace 

 of it is visible. I have taken the pleasure of associating with this new species the 

 name of Dr. Th. Mortensen, who, during the Danish Expedition to Siam, made 

 such excellent collections of Molluscs, in a place of which the fauna had been, 

 hitherto, but slightly known. 



Area (Anadara) cornea, Reeve var. Cecillei (Phil.), Lamy. 



Area [Scapharcw Cecillei Phii.ippi, Kohei.t in Mahtini u. Chf.mmtz, Coiich3'l. Cabin., VIII, 2 Abtli , p. 105, 

 pi. 28, ngs. 3—4 (non pi -10, figs. 2^3). 



— (Anadarcr cornea, Reeve var. Cecillei. Philippi, Lamy, Journ. de Conchy!., vol.55, 1907, p. 241. 



The Gulf of Slam (Pavie, 1885). 



The Danish Expedition to Siam collected no specimens of this species. 



Distribution: — Philippines. 



MoRLET (Journ. de Conchyl., vol. 37, 1889) had identified the specimens col- 

 lected by Pavie as A. boloserica, Reeve. Lamy (loc. cit.), however, points out that 

 they were erroneously determined, and that they belong to the present form. For 

 further details reference should be made to Lamy (loc. cit.), whose view of the 

 synonymy I have adopted. 



Area (Anadara) auriculata. Lam. 



Area auriculata, Lamarck, Hist. nat. d. anim. s. vert., 1819, VI, part. 1, p. 43. — éd. 2, VI, 1835, p. 472. 



— — — Delessert, Recneil de coquilles décr. p. Lamarck, pi. XI, fig. 12. 



— — — L. Mori-et, Journ. de Conchyl., vol.37, 1889, p. 1()2. 



— — — Lamy, Journ. de Conchyl., vol. .52, 1904, p. 156. — loc. cit., vol. 55, 1907, p. 217. 



"Iles du golfe de Siam." Morlet (loc. cit.). 



The Danish Expedition to Siam collected no specimens of this species. 



Distribution: — How far the species from the "l'Océan indien," described 

 by Lamarck, is the same as that which various authors record from the West 

 Indies, I am not prepared to say. Savigny's figure ' of A. auriculata, Lam. (recorded 

 by IssEL- from the Red Sea), can scarcely be Lamarck's species, which, also, has 

 not since been recorded as found in the Red Sea. Ihering' records it from S.Paulo 

 (Brazil), but this seems very improbable, and I venture to suggest that it is due to 

 erroneous determination. 



' Description de l'Egypte. Coquilles, pi. 10, fig. 8. 

 - Malacologia del Mar Rosso, 18G9, p. 88. 

 ' .lourn. de Conchyl., vol.43, 1895, p. 213. 



1). K. !>. Viderlsk. Selsk. Skr.. 7. R.xkke, naturvidensk. o^ m.TUicm. Alii. V. :î. 16 



