DIMYARIA. Lbi 



cave above for the reception of the ligament, which is partly 

 external and partly internal. 



These shells bear an affinity to both the Solenes, and the Anatinae. 

 They also strongly resemble the Modiolas. 



Solemya Mediterranea. — The Mediterranean Solem- 

 YA. Plate XVII. fig. 23. Transversely oblong ; blackish- 

 brown; longitudinally ribbed, with imbricated, projecting 

 foliations ; inside white. ' Inhabits the Mediterranean sea. 



Genus 49— TELLIMYA Brown. 



Generic Character. — Shell equivalve, inequilateral, sub- 

 orbicular or transverse ; left valve without cardinal teeth, 

 but provided with two projecting lateral teeth with a groove 

 in their centre, sometimes with one or two teeth on the right 

 side ; right valve with two recurved prominent teeth ; mar- 

 gin entire. 



This genus consists of two sections.—* Shells orbicular. •» Shells 

 transverse. 



Tellimya tenuis.— TnE Thin Tellimya. Plate XVII. 

 fig. 14. Nearly orbicular, white, thin, ventricose, and shin- 

 ing ; one valve, with two teeth locking into a triangular 

 void in the opposite one, with transverse laminae on each 

 side. One-third of an inch long. Inhabits the British seas. 



Genus 50.— UNGULIN A.— Dawt/m. 



Generic Character. — Longitudinal or subtransverse, 

 rounded above, subequilateral, with the valves close; beaks 

 decorticated ; one short primary cleft tooth in each valve, 

 with an oblong marginal groove divided or narrowed in the 

 middle ; ligament internal, inserted in a pit. 



A remarkable feature in this genus is the cavity being divided into 

 two, the one at the end of the other : the ligament is partially visible. 



Ungulina transversa. — The Transverse Ungulina. 

 Plate XVII. fig. 22. Transversely round, rugose, of a 

 yellowish-brown colour. 



