638 CLASS x. 



Family X. Lepadicea (BLAINV.) s. Anatiferce. Animal sus- 

 pended by a peduncle cylindrical, flexible. Shell mostly com- 

 pressed or involucrum coriaceous. (Genus Anatifa BRUG.)": 



[These Cirripeds consist of a capitulum, much flattened, and a 

 pedicle of various length. The capitulum is generally formed of 

 five or more valves, connected together by narrow or broad stripes 

 of membrane : sometimes the valves are rudimental or absent, when 

 the whole consists of membrane. Of the valves the scuta are the 

 most persistent, then the terga, then the carina, the rostrum and 

 latera occur only in a few (Pollicipes). The scuta and terga are 

 always considerably larger than the other valves. Within the 

 capitulum is the sac which encloses the animal's body. The pedun- 

 cle is usually flattened, sometimes quite cylindrical. Its corium is 

 very thick, and in those genera having numerous valves, scales are 

 found at its connexion with the capitulum placed in whorls. The 

 peduncle is lined by three layers of muscles, running from its bottom 

 to the base of the capitulum : and the cement ducts may be traced 

 upon them on each side until they expand into the two cement 

 glands, and which are connected with the ovarian tubes. The 

 cement escapes through the larval prehensile antennae, which may 

 be always found quite close to the end of the peduncle if it be 

 carefully removed from the surface of attachment. Yid. DARWIN 

 Lepadidce, pp. 28 37. See also above, pp. 608, 609.] 



Tetralasmis Cuv., Ibla GRAY. Peduncle short, hirsute. Shell 

 with four valves, two dorsal long, narrow, and two ventral tri- 

 angular. 



Sp. Tetralasmis hirsutus Cuv., Anatifa quadrivalvis CUVIER Mem. sur Ic* 

 Anatifes, fig. 14, GUEEIN Iconogr., Moll. PI. 37, fig. 7. 



Anatifa LAM. (Species from genus Anatifa BRUG.). Peduncle 

 smooth, resembling intestine, elongate in some. Shell with five 

 valves; the single dorsal valve narrow, falciform. 



Goose-mussel. The four pieces of shell in pairs are, as in the preceding 

 genus, to be compared with the opercular plates of the Balani ; the single 

 piece of shell along the back of the animal carina corresponds to the calca- 

 reous tube, and the stem is as it were an elongation of the basal piece of 

 the tube of the last-named animals. 



Sp. Anatifa Icevis LAM., Lepas anatifera L., BLAINV. Malacol, PI. 86, fig. 3, 

 GuisRlN Iconoyr. 1. 1. fig. I ; this species is often thrown on our shores, 

 especially in the winter months. In different districts of the north, a 

 fable is current that a species of goose (Anas lernicla) has its origin from 



