CALCEOLA 



Lam. Anim. sans vert. 



TESTA sequilatera, insequivalvis, triangularis, 

 subtus complanata. Valva major cuciiUata, ad 

 aperturam obliqufe truncata, margine cardinal! 

 transversim recto, medio emarginato, siibde^T 

 tato ; margine siiperiore arciiato. Valva minor 

 planulata, semiorbicularis, operculum simu- 

 lans ; margine cardinal! tuberculis duobus late- 

 ralibus, fovea mediana et lamella instructo. 



One of the many singular shells placed by Linne among 

 his Anomiae, to some others of which we still think it 

 nearly related ; notwithstanding an opinion which we 

 have heard expressed, that it belongs to the Polypiers; an 

 opinion undoubtedly formed from the consideration of its 

 structure, which must he allowed in some respects to 

 resemble some of them, but this structure is also to be 

 discovered in several other Lamarckian Brachiopodes, as 

 well as in some of his Rudistes, a family upon which we 

 have already expressed our opinion. With respect to the 

 Cakeola, we think that it properly belongs to the Brackio- 

 podeS) that it is related to the Spiriferi of Sowerby, and 

 approaches some of the Terebratulae 5 but Lamarck, how- 

 ever, places it with his Rudistes, 



Shell equilateral, inequivalve, triangular, with a 

 flattish triangular area beneath^ by which we suppose it 

 to have been attached, and the point of which forms the 

 beak or umbo of the larger valve; this area is irregularly 

 and transversely striated. Large valve obliquely trun- 

 cated at the upper side, cardinal margin transversely 

 straight, notched, and somewhat dentatcd in the center 1 



