45 141 
Modiolaria (Gregariella) coralliophaga, (Chemn.) Gmel. 
Mytilus coralliophagus, CHEMNITz, Conchyl. Cabin., VIII, 1785, p. 174, pl. 84, fig. 752. 
— — — GMELIN, Syst. Nat., ed. XIII, 1790, p. 3359, No. 31. 
Modiola semen, LAMARCcK, Anim. s. vert., éd. 2, VII, 1836, p. 26, No. 21. 
-- opifex, Say (non Puivippi), Journ. Acad. Nat. Sc., Philadelphia, IV, 1825, p. 368, pl. 19, fig. 2. 
— — Verritt & Buscu, Trans. Connecticut Acad. X, 1900, p. 516, pl. 58, fig. 3. 
_ divaricata, Puiuirepi, Zeitschr. f. Malakozool., 1847, p. 115. 
_- — _ Abbild. u. Beschreib. neuer od. wen. gek. Conchyl. Modiola, p. 21 (7), pl. Il 
fig. 8. 
Lithodomus divaricalus, Puitirr1, Reeve, Conchol. icon., X, Lithodomus, pl. V, Sp. 34. 
Lithophaga divaricata, Puiviprr, Martini u. CHEmMnNitrz, Conchyl. Cabin., VII Bd. 3 Abth. A, p. 26. 
Modiolaria — LiscHKE, Japanische Meeres Conchyl., IH, p. 148. 
At the north end of Koh Chang, 1—12 fathoms, in old coral blocks (6). 
Long. 7—13 mm. 
Distribution: — Japan, Nagasaki (LiscuKe). — East coast of America from 
Cape Hatteras and the “Lesser Antilles” to Rio Grande do Sul. 
The specimens from the Gulf of Siam agree in all points with the specimens 
from the West Indies. 
Fam. Pteriidae. 
Pteria spectrum, Reeve. 
Avicula spectrum, REEVE, Conchol. icon, X, 1857, Avicula, Sp. 59. 
DuNnKER in Martini u. CHemnitz, Conchyl. Cabin., VII, 3 Abth., 1872, p. 49, 
ploy, figs 1 
Koh Chuen, 30 fathoms (1). 
Long. 22 mm., alt. 11 mm. 
Distribution: — Philippines. 
I have compared the small specimen from Koh Chuen with Reeye’s original 
specimen in the British Museum, and although somewhat different I cannot see 
that it can be referred to any other species than to P. spectrum, Reeve. 
Pteria serrulata, Dunk. 
Avicula serrulata, DunKeErR, Zeitschr. f. Malakozoologie, V, 1848, p. 178. 
= = = Martini u. CHEMNITZ, Conchyl. Cabin., VII Bd. 3 Abth., p. 18, pl. 5, figs. 1—2. 
— lata, Reeve, Conchol. icon., X, Avicula, Sp. 5. 
Between Koh Mesan and Cape Liant, 5—9 fathoms (1). 
Long. 32 mm., alt. 24 mm. 
Distribution: — Moluccas, Torres Strait. 
Professor Ep. vy. MARTENS, to whom I sent the specimen for comparison, writes 
to me as follows: “wahrscheinlich lata Reeve, nur die Form des Ohrs passt nicht 
recht.” 
