CORBULID^. 4.6 



power of complaint ; and all that can be said of them is 



Sic vos non vobis eaxa forate diu. 



It constitutes the type of Fleurian de Bellevue^'s genns ^ 

 Rupicola. Pennant and Donovan described it as Venvs 

 sinuosa, Lamarck as Anatina 7'upicola, Philippi as Ery- 

 cina anodon, Anatina ? pusilla, T. ovalis, T. fabula, and 

 T. elongata, ETeeluz as Rupicola concentrica, and Des- 

 hayes as T. brevis. Many other species have been made 

 by Reeve from Mr. Cuming's specimens of this ex- 

 tremely variable shell. It appears to have been con- 

 founded by Kiener with T. corbuloides, Deshayes, on 

 the supposition that it w^as a smaller form of that 

 species. 



Another species of Thracia [Ainphidesma truncata, 

 Brown^ or T. ntyopsis, Beck) has been found in glacial 

 beds, at Greenock by Mr. Stewart Kerr, and at Elie in 

 Fifeshire by the Rev. Thomas Brow^n. To this species 

 appears to have also belonged a shell named " Cochlo- 

 desma, n. s.^' by Professor King, which was lately 

 brought up from the depth of 1000 f. or thereabouts, 

 100 miles west of Cape Clear, by Capt. Hoskyn in 

 H.M.S. ^Porcupine'; and the fragments of which I 

 have examined. T. my apsis now lives only in the 

 Arctic seas. 



Family XIX. 

 CORBU'LID^, (CORBULAD^) Fleming. 



Body oval or globular : tnhes short and united ; excretal tube 

 furnished with a conspicuous valve : foot long and flexible. 



Shell oval, more or less inequivalve and open at the pos- 

 terior end : beahs turned towards the posterior side : cartilage 

 wholly internal, occupying a horizontal triangular cavity under 

 the beak in each valve : liinge strong, furnished in some genera 



