438 MOLLUSCA, PSAMMOBIAD.E. Psammoma. , 
there are about twelve longitudinal ribs ; a slightly cloven tooth in one valve, 
closing between two in the other, one of which is slightly cloven. 
49s. V. Jragilis. — Suboval, tumid, flexuous and produced 
at the posterior end, with transverse laminal stria?, and minute 
longitudinal ones. 
Tellina fragilis, Linn. Syst. i. 11 7- — T. jugosa, Broivn^ Wern. Mem. ii. 
506. t. xxiv. f. 2. — P. fragilis, Turt. Biv. Brit. 88. t. vii. f. 11, 12.— 
Coast of Ireland. 
Length about an inch, breadth an inch and a half ; brownish ; very tumid 
at the larger end, and sloping to a rough flexuous point at the other ; teeth 
strong, elevated ; in one valve a cloven tooth, with a cavity on each side for 
the reception of the two teeth of the opposite valve. 
49 ^ 3 . P. Laskeyi. — Oval-oblong; slightly contracted retrally, 
with a few obsolete concentric ridges. 
Tellina Last. Mont. Test. Brit. Sup. 28. t. xxviii. f. 3 — Frith of Forth, 
Mr Laskey. 
Length half an inch, breadth three quarters ; purplish white, with an oval 
cuticle ; beaks slightly prominent, retrally ; slightly obtuse ; two approximate 
subbifid teeth in one valve, and a single tooth in the other. 
494. P. Ferroensis. — Transversely-oblong ; obliquely trun- 
cated retrally ; concentrically striated, with a few longitudinal 
ribs behind the fold. 
Tellina rufo maculata. List. Conch, t. cccxciv. — T. incarnata, Penn. Brit. 
Zool. iv. 88. t. xlvii. f. 31. — T. Fer. Mmt. Test. Brit. 55. — P. Fer. 
Turt. Biv. Brit. 94. — Sandy bays, common. 
Length three quarters of an inch, breadth two inches ; reddish, with longi- 
tudinal rays ; compressed ; rounded anteally ; concentric strise distinct, espe- 
cially behind the fold, where they are decussated on the longitudinal ridges, 
the markings strongest on the left valve ; hinge with two teeth in each valve, 
one large and bifid. 
495. P. solidula. — Suborbicular, sHghtly angular retrally, 
with minute transverse striae, and distant obsolete ridges of 
Concha parva, List. An. Ang. 175 — Conch, t. ccccv, f. 251. — T. carnaria, 
Penn. Brit. Zool. iv. 88. t. 49. f. 32. — T. sol. Mont. Test. Brit. 63. — 
P. sol. Turt. Biv. Brit. 95. — On gravelly shores imbedded near low 
water-mark. 
Length about three quarters of an inch; breadth a little more; white, 
more or less tinged or banded with pink ; convex ; the cartilage side sloping 
rather suddenly. 
496. P. rotundata . — Nearly orbicular ; convex ; beaks pro- 
minent, with numerous obsolete transverse striae. 
Tellina rot, Mont. Test. Brit. 71* t. ii. f. 3 — Lucina rot. Turt. Biv. Brit. 
114. t. vii. f. 3. — South coasts of England and Ireland. 
Diameter about an inch ; yellowish-white ; thin, translucent ; slightly trun- 
cated retrally ; beaks a little inclining ; hinge with two teeth in one valve, 
the largest bifid, and slightly diverging ; inner margin slightly striate longi- 
tudinally. 
