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 42 lin. longa, 52 lin. lata, glabra, tenuis, pellucida, cornei 
coloris, epidermide nulla. Valvulæ versus marginem com- 
planatéæ. 
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 wmbones, 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 wmbones 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, projectura a 
- basi umbonis adornata. 
Habitat in rivis. 
Testa 
