88 
valde convexo, levi; postico longiore, angustiore, truncato, ra- 
diatim striato ; margine ventrali in medio sinuoso, posticé an- 
gulato, antice rotundato. 
Hab. 2 
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 a ee 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. 
SpH2nia princers, Adams. S. testd magnd, albd, transversd, 
ovali, inequilaterali, concentricé striatd ; latere antico, longiore, 
rotundato, levi; postico breviore, angustato, subtruncato, radia- 
tim sulcatd ; 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.) 
SpH2nraA ELLIPTICA, Adams. _ S. testd transversd, ovali, sub- 
equilateral, albd, fragili, utrinque rotundatd, epidermide tenui 
partim obtectd, concentricé striatd ; latere antico levi, postico 
radiatim striato ; impressione pallii vix sinuatd ; dente cardi- 
nis sepe valde antice fisso. 
Hab. in Australasia. 
Shell transverse, oval, subequilateral, 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. 
SpH2ENIA DECURTATA, Adams. S. testd transversd, ovali, sub- 
equilaterali, albd, concentricé transversim sulcatd; longitudina- 
liter tenuissimée radiatim striatd; anticé latiore, rotundatd, 
postice angustatd, angulatd, abrupte truncatd ; margine ventrali 
arcuato, integro ; impressione pallii sinu parvo ; dente cardinis 
anticé valde fisso. 
Hab. in insulis Philippinis. 3 
Shell transverse, oval, subequilateral, white, transversely concentri- 
