bs 
elevated; corselet Juddehi y depressed; margin reg- £, 
^ 
2 
TW 
*5 
332 Marine Shells of Massachusetts. 
Remarks. This species is readily distinguished 
by its dark mahogany color. The only native spe- 
cies, which, to my knowledge, resembles this in 
form, is P. armifera, Say, which, kis is white, 
and has humerous teeth. * 
t 
ART. IX. — DESCRIPTION OF TELLINA TENTA, SAY, AND 
.OF HELIX SERPULOIDES, MONTAGU, WITH REMARKS ` 
ON OTHER rapide — e MASSACHUSETTS. 
By C. B..Apams, Mem f ihe Bos em Hist., Prof. 
Chem. and Nat. Hist. in sic din e, 
TELLINA TENTA. 
Synonyme. Tellina tenta ; Bay, American e 
chology, No. VIII. pl. 65, fig. 3. 
T. testa tenui, albá, dextrorsim deflectà ; valvà sinistra valdé con- 
vexà , epidermide tenui ; margine dorsali ostremé depressà, anteriüs 
elevato; margine anteriori infra rotundato, posteriori subtruncato. 
pa 
Shell rather small, thin, white, widely gaping pos- 
teriorly, with ERR incremental striæ, inequilater- 
al, with the posterior portion two-thirds of the. length 
and one-half of the superficies of the anterior portion ; 
left valve very convex ; both valves much deflected 
by the fold to the RG ; epidermis very thin, mem- 
branous, dingy white ; beaks rather prominent ; lunule 
ularly rounded anteriorly and below, or sometimes | Ed 
sub-rectilinear below, sub-truncate ‘posteriorly ; shi w 
internally white, dingy beneath the umbo, radiated — 
with faint impressed lines ; hinge with lateral teeth, 
and two erect, prominent, THO inferiorly diverging 
cardinal teeth on the right valve, and on the left 
” Erratum. In the title of Article VIIL., p. 318, for Thirteen read 
Eleven. 
pst ei 
E. ab EE 
