118 Dr. Tate on the Mollusca of Alnwick. 



Fam. Aueiculidte. 



Gen. Conovulus, Lamark. 



41. C. denticulatus, Mont. 



Rare. A single recent specimen found below the Churchill 

 at Alnmouth, near high water mark. 



GrEN. Carychium, Mull. 



42. C. minimum, Miill. 



This very minute species is common among moss, herbage, 

 and decaying leaves. Ratcheugh, &c. 



Class II. — Acephala. 

 Ord. — Lamellibranchiata. 

 Fam. — Cycladid^. 

 Genus— Cyclas, Brugiere. 



43. C. cornea, Linn. 



Common in rivers, ponds, and ditches. River Aln, Aln- 

 wick moor. 



Gen. Pisidium, PfeifFer. 



44. P. obtusale, PfeifF. 

 Frequent in ditches. Alnwick moor. 



45. P. pusillum, Turt. 



In ponds and ditches. Dunstanburgh, Alnmouth. 



46. P. pulchellum, Jenyns. 



Ponds and ditches. Dunstanburgh, Kimmere lough. 

 Fam. UNTONiDiE. 

 Gen. Anodonta, Brugiere. 



47. A. cygnea, Linn. 



Common in running water and occasionally in ponds. 

 River Aln, Howick pond. 



Dead shells of the following species are occasionally met 

 with at Alnmouth, where they have been introduced with 

 ballast: — Paludina vivipara, Bithinia tentaculata, Neritina 

 fluviatilis and Unio pictorum. 



