138 DIMYAIRA. 



Amphidesma reticulata. — The Reticulated Amphidesma. 

 Plate XVII. fig. 24. Sub-orbicular, sub-diaphanous, compres- 

 sed, finely reticulated ; yellowish-white. One inch and a quar- 

 ter long. Inhabits the West Indian seas. 



Genus ^S.—SOhEMY A.— Lamarck. 



Generic Character. — Inequilateral, equivalve, transversely 

 elongated, extremities obtuse, with the epidermis smooth, shin- 

 ing, and projecting; beaks not prominent and hardly distinct ; 

 a dilated, compressed, somewhat oblique cardinal tooth in each 

 valve ; slightly concave above for the reception of the ligament ; 

 ligament partly external and partly internal. 



Thpse shells bear an affinity to both the Solenes, and the Anatinse. They 

 al-o strongly resemble the Modiola. 



Solemya Mediterranea. — The Mediterranean Solemya. 

 Plate XVII. fig. 2.3. Transversely oblong ; bluckish-brown ; 

 longitudinally ribbed, with imbricated, projecting foliations j in- 

 side white. Inhabits the Mediterranean sea. 



Genus 49.— TELLIMYA.— BroMJn. 



Generic Character. — Shell equivalve, inequilateral, sub-orbi- 

 cular or transverse ; left valve without cardinal teeth, but pro- 

 vided 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 ; margin entire. 



This genus consists of two sections.—* Shells orbicular. ** Shells trans- 

 verse. 



Tellimya tenuis The Thin Tellimya. Plate XVII. fig. 



14. Nearly orbicular, white, thin, ventricose, and shining ; one 

 valve, with two teeth locking into a triangular void in the oppo- 

 site one, with transverse laminje on each side. One-third of an 

 inch long. Inhabits the British seas. 



Genus 50. — UNGULINA.— Z)aM:/irt. 



Generic Character. — Longitudinal or subtransverse, rounded 

 above, subequilateral, with the valves close ; beaks decorticat- 

 ed ; one short primary cleft tooth in each valve, with an oblong 



