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CIRRPHIPEDA. 



Shell sessile or elevated; on a flexible, tendinous pedicle; multivalve; some- 

 times moveable, sometimes fixed; the inside covered by the mantle of the animal. 



The Cirrphipeda are divided into two orders: — Sessile Cirrphipeda and 

 Pedunculated Cirrphipeda. 



ORDER I. SESSILE CIRRPHIPEDA.— Six Genera. 



The shells of this order are fixed on marine bodies. 



Tubicinella. Shell univalve, operculated, tubular, erect, a little atten- 

 uated towards the base, bound with annular, transverse ribs, truncated at both 

 ends, open at the summit, and closed at the base with a membrane. Oper- 

 culum with four obtuse valves. 



T. balaenarium. 



Coronula. Shell sessile, fixed, conical, summit truncated, closed at the 

 base by an adhering, testaceous lamina. Aperture subtriangular, or elliptical. 

 Operculum internal, quadrivalve, the valves moveable, inserted near the base 

 of the inside of the shell. 



C. diadema, 



C. balanaris, 



C. testudinaria, 



C. pulchra. 



Balanus. Shell sessile, fixed, conical, summit truncated, closed at the 

 base by an adhering, testaceous lamina. Aperture subtriangular, or elliptical. 

 Operculum internal, quadrivalve, the valves moveable, inserted near the base 

 of the inside of the shell. 



B. angulosus, 



' sulcatus, 



' tintinnabulum, 



' nigrescens, 



' cylindraceous, 



' calycularis, 



' rose us, 



' ovularis, 



B. miser, 



' amphimorphus, 



' perforatus, 



{ lsevis, 



' spinosus, 



' radiatus, 



' palmatus, 



B. stalactiferus, 

 ' plicatus, 

 ' duploconus, 

 ' patellaris, 

 ' semiplicatus, 

 ' galeatus, 

 ' subrimbricatus, 



B. rugosus, 



' plancianus, 



' crispatus, 



' piinctatus, 



' fistiilosiis, 



' latus, 



' lyonsii. 



