438 MOLLUSCA. PSAMMOBIAD^. Psammobia. 



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. 



492. V. yragilis. — Suboval, tumid, fiexuous and produced 

 at the posterior end, with transverse laminal striae, and minute 

 longitudinal ones. 



Tellina fragilis, Linn. Syst. i. 117 — T. jugosa, Broimi, Wern. Mem. ii. 



506. t. xxiv. f. 2 V. fragilis, Turt. Biv. Brit. aS. t. vii. f. 11, 12.— 



Coast of Ii-eland. 

 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. 



493. P. Laskeyi. — Oval-oblong ; slightly contracted retrally, 

 with a few obsolete concentric ridges. 



Tellina Lask. MonL 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, Avith a few longitudinal 

 ribs behind the fold. 



Tellina rufo maculata, List. Conch, t. cccxciv. — T. incaiiaata, Penn. Brit. 

 Zool. iv. 88. t. xlvii. f. 31.— T. Fer. Mont. 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 striie 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, slightly angular retrally, 

 with minute transverse striae, and distant obsolete ridges of 

 growth. 



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 



Avater-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 stride. 



Tellina rot. Mont. Test. Brit. 71- 1. 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 strLite longi- 

 tudinallv. 



