89 
cally sulcated ; longitudinally very finely radiately striated ; anteriorly 
rounded and wider, posteriorly narrower, angulated and abruptly 
truncated ; ventral margin arched, entire ; pallial impression with a 
small, sinus; hinge with the tooth of the left valve deeply fissured 
anteriorly. 
Hab. Catanuan, province of Tayabas, island of Luzon, in sand at 
low water ; H. C. (Mus. Cuming.) 
Spieenia philippinarum, Adams. S. testa ovali , transversei, 
subineequivalvd, alba , tenui, ventricosa, incequilaterali; latere 
antico longiore, rotundato , Icevi; postico breviore , radiatim 
striato , vix truncate); epidermide fusco tenui tecta; margine 
ventrali interdum subsinuato ; impressione palliali sinu parvo ; 
dente cardinis valvulce sinistree trilobate). 
Hab. in insulis Philippinis. 
Shell oval, transverse, slightly inequivalve, thin, white, ventricose, 
inequilateral; anterior side longest, rounded, smooth ; posterior side 
shortest, radiately striated, slightly truncated and covered with a very 
thin brown epidermis; ventral margin sometimes slightly sinuated*; 
pallial impression with a small sinus; hinge with the cardinal tooth 
of the left valve trilobate. (Mollusca, PI. X. fig. 7—9.) 
Hab. Sibunga, island of Zebu, fine sand, 30 fathoms ; H. C. Bay 
of Manila, clayey sand, 6 fathoms ; H. C. (Mus. Cuming.) 
Sphjsnia Ruppellii, Adams. S. testa transverso-elongatd , trans¬ 
verse striata , epidermide fusco tecta; latere antico breviore , 
rotundato , gibboso, obsolete radiatim striato ; postico longiore , 
angustiore, subrostrato , truncato; dente cardinis valvulce 
sinistree subsinuato. 
Hab. in Mari Rubro. 
Shell transversely elongated, covered with a reddish-brown epider¬ 
mis, transversely striated; anterior side the shortest, rounded, gib- 
hose, obsoletely radiately striated; posterior side narrower, rather 
beaked, widely gaping and truncate; tooth of left valve slightly 
sinuated. 
Hab. Red Sea ; Dr. Riippell. 
Sph^nia mindorensis, Adams and Reeve. 
Voy. Zool. Samarang , t. . f. 
May 14, 1850. 
William Yarrell, Esq., Y.P., in the Chair. 
The Secretary stated that, through the liberality of Ronald Gunn, 
Esq., and Dr. Grant, of Launceston, the Menagerie had been en¬ 
riched by the safe arrival of two living specimens of Thylacinus cyno- 
cephalus (Mammalia, PI. XVIII.) : and he read the following letter 
in reference to this most valuable and interesting gift, which has 
