95 121 
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 Kut, 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. Tu. MorrENSEN, 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. 
Arca (Anadara) cornea, Reeve var. Cecillei (Phil.), Lamy. 
Arca (Scapharca) Cecillei (Puiniepr), KopeLr in Martini u. CHemnitz, Conchyl. Cabin., VIII, 2 Abth., p. 105, 
pl. 28, figs. 3—4 (non pl. 40, figs. 2—3). 
— (Anadara) cornea, REEVE var. Cecillei, PHitipp1, Lamy, Journ. de Conchyl., vol. 55, 1907, p. 241. 
The Gulf of Siam (Pavre, 1885). 
The Danish Expedition to Siam collected no specimens of this species. 
Distribution: — Philippines. 
Mortet (Journ. de Conchyl., vol. 37, 1889) had identified the specimens col- 
lected by PaviE as A. holoserica, 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. 
Arca (Anadara) auriculata, Lam. 
Arca auriculata, Lamarck, Hist. nat. d. anim. s. vert., 1819, VI, part.1, p.43. — éd.2, VI, 1835, p. 472. 
= _ = Deessert, Recueil de coquilles décr. p. Lamarck, pl. XI, fig. 12. 
— — — L. Mortet, Journ. de Conchyl., vol. 387, 1889, p. 162. 
— a= — Lamy, Journ. de Conchyl., vol. 52, 1904, p. 156. — loe. cit., vol. 55, 1907, p. 217. 
“Iles du golfe de Siam.” Morvert (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. Savicny’s figure! of A. auriculata, Lam. (recorded 
by IssEL? from the Red Sea), can scarcely be Lamarcx’s species, which, also, has 
not since been recorded as found in the Red Sea. Inerina* records it from S. Paulo 
(Brazil), but this seems very improbable, and I venture to suggest that it is due to 
erroneous determination. 
1 Déscription de ’Egypte. Coquilles, pl. 10, fig. 8. 
2 Malacologia del Mar Rosso, 1869, p. 88. 
8 Journ. de Conchyl., vol. 43, 1895, p. 213. 
D. K. D. Vidensk. Selsk. Skr., 7. Reekke, naturvidensk. og mathem. Afd. V. 3. 16 
