150 Rev. R. Sheppard's Account 



2. Tellina stagnicola. 



T. testa rhombea glabra, umbone exserto. 



Cyclas calyculata, var. 2. Lamarck, Anim. sans vert. v. 559- 



Habitat in stagnis. 



Testa 4^ lin. longa, 5^ lin. lata, glabra, tenuis, pellucida, cornei 



coloris, epidermide nulla. Valvulae versus marginem com- 



planatae. 



This I have always considered to be a distinct species, and 

 have described it under the name by which I was favoured with 

 a specimen by Dr. Leach. 



It may easily be distinguished from the T. lacustris of the Lin- 

 nean Transactions and the Cyclas calyculata of Draparnaud, by 

 the remarkable projection of its umbones, which appear like 

 young shells glued upon those parts. 



In abundance in a small pond at OfFton, on Mrs. Leake's 

 farm, on the right-hand side of the path leading to Somersham 

 by the fields. 



In ponds at Wrabness in the county of Essex it is very com- 

 mon. The gravel-pit pond on the glebe there produces a variety 

 in which the umbones touch each other. It is remarkable that 

 the young only of this species are to be found in the spring ; the 

 adults not emerging from their muddy retreats till the summer, 

 when they rise near the surface, and adhere to plants in great 

 quantities. 



Cases formed of these shells by the Caddis-worms are very 

 beautiful, resembling bunches of grapes. 



4. Tellina Henslowana. 



T. testa oblique subovata transversim vix sulcata, projecturd a 



basi umbonis adornata. 

 Habitat in rivis. 



Testa 



