88 
valde convexo, Icevi; postico longiore, angustiore, truncaio, ra- 
diatim striato ; margine ventrali in medio sinuoso, postice an- 
gidato, antice rotundato. 
Hah. -? 
Shell white, transverse, oval, inequilateral, concentrically striated; 
anterior side shortest, very convex, smooth ; posterior side the longest, 
narrower, truncated and radiately striated ; ventral margin sinuated 
in the middle, angulated posteriorly, rounded anteriorly. 
Hab. -? 
This species have sculpture similar to Sp. princeps , but the valves 
are more gibbous, especially at the anterior part; the shell is much 
thinner, and the general outline different. 
Mya semistriata, Hanley, Zool. Proc. 1843. 
Sphjenia princeps, Adams. S. testa magnd, alba, transversd, 
ovali, inequilaterali, concent rice striata ; latere antico, longiore, 
rotundato, Icevi; postico breviore, angustato, subtruncato, radia- 
tim sulcata; margine ventrali arcuato, integro; impressione 
palliali vix sinuatd; dente cardinis emarginato. 
Hab. in insulis Philippinis. 
Shell large, white, transverse, oval, inequilateral, concentrically 
transversely striated ; anterior side longest, rounded and smooth; 
posterior side shortest, narrow, subtruncated and radiately sulcated ; 
ventral margin arcuated and entire ; pallial impression with a slight 
sinus; hinge with the edge of the cardinal tooth of the left valve 
emarginate. 
Hab. Philippine Islands; H. C. (Mus. Cuming.) 
SpHiENiA elliptica, Adams. S. testa transversd, ovali, sub- 
cequilaterali, alba, fragili, utrinque rotundatd, epidermide tenui 
partim obtectd, concentrice striata; latere antico Icevi, postico 
radiatim striato ; impressione pallii vix sinuatd; dente cardi¬ 
nis scepe valde antice fisso. 
Hab. in Australasia. 
Shell transverse, oval, suhequilateral, white, fragile, rounded at 
both ends, partially covered with a slight epidermis, concentrically 
striated; anterior side smooth, posterior side radiately sulcated ; 
sinus of pallial impression very shallow ; hinge with the tooth of the 
left valve often deeply fissured anteriorly so as to exhibit an apparent 
distinct anterior tooth. 
Hab. Sydney, 4 fathoms, mud ; Mr. F. Strange. (Mus. Cuming.) 
Mus. Hanley. 
Sph^enia dectjrtata, Adams. S. testa transversd, ovali, sub- 
cequilaterali, alba, concentrice transversim sulcata; longitudina- 
liter tenuissime radiatim striata; antice latiore, rotundatd, 
postice angustatd, angulatd, abrupte truncate ; margine ventrali 
arcuato, integro ; impressione pallii sinu parvo ; dente cardinis 
antice valde Jisso. 
Hab. in insulis Philippinis. 
Shell transverse, oval, suhequilateral, white, transversely concentri- 
