142 UNIONlDiE. 



A fine specimen measured three inches in length, and 

 rather more than half that breadth at the widest part. 



The animal has plain white edges to its mantle. The 

 branchial portion is mottled with orange brown, and fringed 

 with numerous short cirrhi ranged in several irregular 

 rows along the inner edges. The anal portion forms a 

 plain edged tube-like projection, about half as wide as the 

 former, and of a darker colour being more or less striped 

 with purplish brown. The foot is of pale orange tint, thick 

 and broad. Troschel observes that the lips are broader 

 than long, and united together for half their hinder margin. 

 The outer branchial leaflet is united to its end with the 

 mantle ; the inner one is free and not combined with the 

 foot. 



It is found in the New River, in the Avon, and Kennet, 

 the Ouse, and several rivers in the east of England, not 

 ranging northwards beyond the south of Yorkshire. In 

 the Ely river, Cardiff" (Jeffreys). On the continent it is 

 chiefly plentiful in France, Belgium, and Germany. 



U. pictorum, Linnaeus. 



Posterior end not cuneiform ; umbonal tubercles small, not 

 confluent ; anterior teeth compressed, elevated, sometimes crested. 



Plate XXXIX. fig 1, and (Animal) plate Q. fig. 2. 



Lister, Hist. Conch, pi. 147, f. 3. — Schroter, Flussconch. 

 pi. 4, f. 6. 

 Mya pictorum, Linnaeus, Syst. Nat. ed. 12, p. 1112. — Pennant, Brit. Zool. 

 ed. 4, vol. iv. p. 79, pi. 43, f. 17. — Da Costa, Brit. Conch, 

 p. 228, pi. 15, upper f. 4. — Maton and Rack. Linn. Trans, 

 vol. viii. p. 38. — Dorset Catalog, pi. 12, upper f. 4. — Turton, 

 Conch. Diction, p. 106. — Linn. Fauna Suecica, ed. 2, p. 51G. — 

 Sturm, Deutsch. Fauna, Wiirmer, pt. 2. — Wood, General 

 Comb. p. 104, pi. 10, f. 34. — Dillwyn, Recent Shells, vol. i. 

 p. 4 9.— Index Testaceolog. pi, 2, Mya, f. 26. 



