87 
SpH2niA, Turton. 
Animal ovatum ; pallium antice clausum, preter aperturam pro 
pede parvo digitiformi sulco byssali instructo ; siphones con- 
nati usque ad eatremitates, orificia cirrata ; sipho analis val- 
vuld tubulari membranaced extra orificium productd. 
Testa oblonga, inequivalva, inequilateralis, magis minusve postice 
hians ; levis, vel rugosa, epidermide tecta ; umbones incurvatt ; 
cardo dente laminari dilatato erecto in valvuld sinistrd, alveo 
convenienti in valvuld dextrd; ligamentum internum ; impres- 
siones pallit sinu parvo. 
Animal ovate; mantle closed in front, except an opening for the 
passage of a small digitiform foot furnished with a byssal groove ; 
siphons united to their extremities, their orifices cirrated ; anal siphon 
with a tubular membranous valve projecting beyond the orifice. 
Shell oblong, inequivalve, inequilateral, more or less gaping poste- 
riorly ; surface of the valves smooth or rugose, covered with an epi- 
dermis; beaks incurved ; hinge composed of an erect, dilated, laminar 
tooth in one valve, with a corresponding pit in the other; ligament 
internal ; pallial impression with a slight sinuation. 
Spuanza Bincuamt, Turton. S. testd inequivalvd, inequila- 
terali, ovato-trigonali, transversim concentricé sulcatd, epider- 
mide olivaceo tectd; latere antico breviore, rotundato, postico 
longiore, hiante, subtruncato ; impressione pallit sinu subpro- 
fundo, rotundato ; dente cardinis valvule sinistre posticé sub- 
sinuato. 
Hab. in littoribus Britannicis. 
Shell inequivalve, inequilateral, ovately trigonal, transversely con- 
centrically sulcated, covered with an olivaceous epidermis; anterior 
side shortest, rounded, posterior side longest, gaping, subtruncate ; 
sinus of pallial impression rather deep and rounded ; tooth of left valve 
posteriorly sinuated. 
Had. British islands. 
SpH=NIA DECusSATA, Deshayes, sp. S. ¢estd ovato-oblongd, sub- 
equilateral, postice truncatd, subrostratd, rostro basique ob- 
lique carinatd, albd, stris longitudinalibus, transversisque 
tenuissime decussatd ; umbonibus magnis, oppositis ; dente car- 
dinali magno, obliquo, compresso in valvd sinistrd, in valvd 
dextrd foveold profundd, marginatd. 
Hab. in Sumatre maribus. 
Shell ovately-oblong, subequilateral, posteriorly truncated, sub- 
rostrate, beak and base obliquely carinated, white, very finely decus- 
sated with longitudinal and transverse strie ; umbones large, oppo- 
site; cardinal tooth large, oblique, compressed in the left valve, in 
the right valve a deep marginated pit. 
Hab. Seas of Sumatra. 
SpHENIA SEMISTRIATA, Hanley, sp. 8. festd albd, transversd,. 
ovali, inequilaterali, concentrice striata ; latere antico breviore, 
