CIRRIPEDIA. 



445 



and the animal loses all its appendages and its alimentary canal, and 

 extracts the juices of its host (Decapoda] by means of root -like 

 processes (fig. 354). 



1. Pedunculata. There is A peduncle and six pairs of biramous 

 feet ; the mantle has usually carina, scuta, and terga. 



Fain. Lepadidse. Peduncle well marked, and not provided with calcareous 

 plates. There is a membranous mantle, which, as a rule, is provided with rive 

 shell plates, of which the scuta and terga lie behind one another (fig. 348, a). 

 Lcpas L. (Anatifa Brug.), L.faxeJciilnrix Ellis. (?vYm/. Lam.) Found from the 

 Northern Seas to the South Sea. L. anatifcm L., cosmopolitan. Conch oil rr in a, 



FIG. 35b.a,Saceulina,ywrpwea (after Fr. Mfiller). Or, Aperture of the mantle sac; II", 

 root-like processes; K, genital aperture. l>, Nauplius larva of Kiccitlina. A',A'',Milf, 

 appendages, e, Pupa of Lerna-adixctix /im-rel/tina- (after Fr. Miiller). F, The six pairs of 

 legs ; Ab, abdomen ; A', attaching anteiin;e ; O, eye. 



Olf. (Ofin/t, Clni-riix Leach.), C. rin/dtn Spengl., frequently attached to 



C. at/rita L., Am-laxinu- Darwin. The stalk is provided with root -like processes, 



which grow into the skin of Squalidce. A. squalicola Lovcn. 



Fam. Pollicipedidae. Peduncle not sharply distinct, scaly or hairy. The 

 shell plates very strong, numerous. The scuta and terga lie close to one 

 another. There are sometimes complements! males. Polliripcx cornni-u/tifi. 

 Leach.. Ocean and Mediterranean. Scitlju'Uiini rttlf/ftrr Leach., North Sea and 

 Mediterranean. &. ornutiim Gray, South Africa. Hilu quadrivalvii Guv., 

 South Australia. ./. Citnilmjii Darw., Philippines. 



