128 32 
Distribution: -— Persian Gulf, Gulf of Aden, Madagascar (VOELTzKOW). — 
Philippines, China (Hongkong, Shanghai), North Australia, Torres Strait, Tasmania (?). 
Arca (Cucullaea) concamerata, Mart. 
Arca concamerata, Marrini, Beschaft. d. Berlin. Gesellsch. Naturf. Freunde, II, 1777, p. 292, pl. VII, figs. 
15—16. 
— cucullata, — Conchyl. Cabin., VII, p. 174, pl. 53, figs. 526—28. 
— Cucullus, Gmev., Syst. Nat., ed. XIII, p. 3311, No. 23. 
Cucullewa auriculifera, Lamarck, Anim. s. vert., éd.2, VI, p. 454. 
— concamerata, Martini, REEVE, Conch. icon., XVII, Cucullaa, Sp. 1. 
Cucullaea _ ~ Martini u. CHEMNITZ, Conchyl. Cabin., VII, 2 Abth., p. 5, pl. 1, figs. 3—4; 
pl. 5, figs. 1—2. 
Cucullea — — Lamy, Journ. de Conchyl., vol. 55, 1907, p. 306, 
Cuculle@a granulosa, JONAS, Proc. Zool. Soc. London, XIV, 1846, p. 34. 
= - Reeve, Conch. icon., XVII, Cucullaa, Sp. 2. 
— Lamy, Bull. du Mus. d’Hist. Nat. Paris, 1904, p. 278. — Journ. de Conchyl., vol. 55, 
1907, p. 306. 
Koh Lan, 30 fathoms, mud (1). Koh Chuen, 10—30 fathoms (2!'/2). Between 
Koh Chuen and Koh Chang, 15 fathoms, mud (4). S. of Koh Samit, 14 —18 fathoms (1/2). 
Between Koh Kut and Koh Kahdat, 10 fathoms, shells (2). E. of Koh Mak, 20 
fathoms, mud (1). 
The Gulf of Siam, on the west coast of Cambodge (H. Crosse & P. FiscHer, 
C. granulosa, Jon.).' > 
Long. 4—92 mm. 
Distribution: — Singapore, Mergui Archip., Nicobars, Madras, Tranquebar, 
Ceylon, Persian Gulf, Gulf of Aden, Red Sea (subfossil), Seychelles. — China, For- 
mosa, Japan (Nagasaki), Torres Strait, New Caledonia. 
I have specimens at hand from the Gulf of Siam which, with respect to the 
number of the outer lateral teeth agree entirely with the description of Cucullaea 
granulosa, Jonas (Reeve). The number of the teeth in the latter form is, however, 
quite unreliable as a distinguishing mark, as the lateral teeth in at least the younger 
individuals (e. g. in individuals measuring 65 mm. in length) pass into the rest of 
the row of teeth without any interval or other separation. 
Pectunculus amboinensis, Gmel. 
Cardium amboinense, GMein, Syst. Nat., ed. XII, 1790, p. 3255, No. 43. 
Arca pectunculus, Linnté, part. Syst. Nat.. ed. X, p. 695, No. 150. -— ed. XII, p. 1142, No. 180. 
_ —  Manrrint & Cuemnirz, part., Conchyl. Cabin., VII, p. 235, pl. 58, figs. 568—69. 
Pectunculus pectiniformis, LAMAncK, part. Hist. nat. d. anim. sans vert., VI, 1 part. 1819, p. 53, No, 16. — 
éd. 2. VI, 1835, p. 494, No. 16. 
— = — Reeve, Conchol. icon., I, Peclunculus, Sp. 11. 
-- — _ L. Monter, Journ. de Conchyl., vol. 37, 1889, p. 163. 
— pectunculus, Linnt, EpvaG. A. Smiru, part., Proc. Zool. Soc. London, 1891, pp. 482—33. 
1 Journ. de Conchyl., vol. XL, 1892, p. 76. 
