ORDER I. SESSILES. 17 



PL II. Fig. 2. 



Coronula bal/enaris, Lamarck, Ann. du Mus., vol. i. p. 468. pi. 30. 



f. 2 to 4. 

 Lepas baleenaris, Linnaeus. 

 Polylepas vulgaris, Gray. 



PL II. Fig. 3. 



Coronula testudinaria, Lamarck, Anim. sans vert., vol. v. p. 387. 

 Lepas testudinarius , Linnaeus. 

 Astrolepas testudinarius, Klein. 

 Chelonobia vulgaris, Leach. 



ELMINEUS, Leach. 



Testa subconica, valvis quatuor solidis inaequalibus lateraliter ferrumina- 

 tis composita ; apertura apicali magna, basi testacea nulla ; oper- 

 culo valvis quatuor composito, pari antico subhorizontali. 



The genus Elmineus, proposed by Dr. Leach, differs materially in its 

 characters from the other Sessile Lepades ; its shell is composed of four 

 small, solid, unequal pieces, forming a very wide aperture at the top, but 

 without a testaceous base. The operculum is large, corresponding with 

 the size of the aperture, and consists of four pieces. 



Example. 

 L Fig. 1 z 

 Elmineus Leachii, King, Zool. Journ., vol. v. p. 334. 



PL III. Fig. 1 and 2. 



CATOPHRAGMUS, Sowerby. 



Testa subconica, apice pervio, valvis octo inaequalibus lateraliter adjunc- 

 ts composita ; valvis porro plurimis per series externas circulares 



VOL. I. D 



