OTIOX. CIRR1PEDA. 



shell are isolated or much separated, and do not entirely cover 

 the body. But, however great the difference between the shells 

 of the pedunculated and the sessile species of this class, the 

 animals are analogous in point of structure or organization ; and 

 the shells of both, simply attached to the body, or fixed on the 

 summit of the peduncle, are essentially different from those of the 

 bivalves, where the two pieces of the shell are connected by a 

 ligament and hinge. The animals of this class are hermaphro- 

 dite, and are all marine. 



Lamarck divides the class Cirripeda into two orders. 

 Order I. PEDUNCULATA. Body supported by a tubular move- 

 able peduncle, of which the base is fixed upon marine bo- 

 dies ; mouth almost inferior. 



Order II. SESSILIA. Body destitute of peduncle, and fixed by 

 the shell upon marine bodies ; mouth superior and anterior. 



ORDER I. PEDUNCULATA. 



Body supported on a tubular peduncle. 



Gen. 1. OTION, Leach. Lepas, Lin. 



Body pedunculated, enveloped in a membranous tunic, ventri- 

 cose above ; two tubes disposed in the form of horns direct- 

 ed backwards, open at their extremity, truncated, and placed 

 at the summit of the tunic ; a lateral opening, with many ar- 

 ticulated ciliated arms. Shell with two small testaceous semi- 

 lunar valves, adhering near the lateral opening. 



O. Cuvieri, Leach. ( L. aurita, Lin.) Body and horns without spots. 

 Inhabits Northern ocean. Mem. du Mus. ii. pi. 5, fig. 12. 



Gen. &. CINETIAS, Leach. Lepas, Poll. 

 Body pedunculated, enveloped in a membranous tunic, with 

 an opening anteriorly below the summit, and many slender, 

 articulated ciliated arms. Shell with five testaceous, oblong, 

 separate valves, of which two are on the sides of the opening 

 and the others dorsal. 



C. vittata, Leach. Pale bluish purple, with three bluish stripes on 

 each side of the body. Inhabits coasts of England. Lin. Trans 

 xi. pi. 12, fig. 2. 



Gen. 3. POLLICIPES, Leach. Lepas, Gmel. 

 Body covered by a shell, and supported by a tubular and ten- 

 dinous peduncle ; many tentacular arms. Shell compressed 

 on the sides, and multivalve, the valves almost contiguous, 



