126 CIRRIPEDA. SESSILIA. 



moveable operculum is of four pieces, and forms an interior often pointed cone, di- 

 latable at the will of the animal for the passage of the cirri. 



B. tintinnabulum, Lam. Shell purplish,, with the valves irregularly 

 and strongly ribbed longitudinally, and the interstices delicately 

 striated transversely ; operculum rostrated behind. ^ inch to 2 

 inches diameter. Inhabits American, Indian, and European 

 seas Wood's Conch, pi. 6, fig. 1 and 2. 



B. ovularis, Lam. Shell gregarious, cylindrical, ventricose, trun- 

 cated, white, smooth ; aperture dilated ; rays smooth ; valves of 

 the operculum subacute. Inhabits seas of Europe on marine 

 bodies Chem. viii. pi. 97, fig. 824. 



B. spinosus, Lam. Shell reddish white, ovate-conical, with rows 

 of incurved spines, and the interstices striated transversely. 1 

 inch in diameter. Indian seas Chem. viii. pi. 98, fig. 840. 



B.Jut*lo*tu, Lam. Shell elongated, tubular, striated, the valves 

 dilated at the aperture ; operculum obtuse. Inhabits Northern 

 seas. B Brown's Illust. pi. J, fig. 21. 



B. galeatus, Lam. Shell obliquely oval subconical ; aperture oblique, 

 trigonal. Inhabits Asiatic seas, imbedded in the stems of Gor- 

 gonice. Lam. v. 395. 



Gen. 5. CORONULA, Lam. 



Body sessile, enveloped in a shell, with small setaceous and cir- 

 rous arms ; shell sessile, appearing univalve, suborbicular, 

 conoidal, truncated at the extremities, with the walls very 

 thick, and interiorly hollowed in radiating cells ; operculum 

 with four obtuse valves. 



The shells of this genus are found on the bodies of marine animals, such as whales, 

 tortoises, &c. the base of the shell sinking into the body where the integuments are 

 not too hard. They are also sometimes found on shells, &c. 



C. diadema, Lam. Shell subhemispherical, transversely striated 

 throughout, and the valves strongly ribbed longitudinally. In- 

 habits the Northern seas, on whales. Wood's Conch, pi. 4. 



C. testudinaria, Lam. Shell oval, depressed, with nearly smooth 

 valves, and deep narrow transversely striated interstices. Inha- 

 bits the Mediterranean sea, on the shells of tortoises. Wood's 

 Conch, pi. 5, fig. 4. 



Gen. 6. TUBINICELLA, Lam. 



Body inclosed in a shell, with the cirri small, setaceous, and 

 unequal. Shell univalve, operculated, tubular, straight, slight- 

 ly narrowed towards the base, surrounded with transverse ribs, 

 truncated at both ends, open at the summit, and closed at the 

 base by a membrane; operculum with four obtuse valves. 



T. balcenarum, Lam. Found on whales in S. American seas. 

 Sup. Encyc. Brit. iii. pi. 57- 



