CIEEIPEDIA.. 



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. 



Fam. Lepadidae. Peduncle well marked, and not provided with calcareous 

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

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

 Lepas L. (Anatifa Brug.), L. fascicularis Ellis, (vitrea Lam.) Found from the 

 Northern Seas to the South Sea. L. anatifera L., cosmopolitan. Cbnohoderma 



Fio. 354. , Sacculina purpurea (after Fr. Muller). Oe, Aperture of the mantle sac; IP, 

 root-like processes ; JT, genital aperture. 6, Nauplius larva of Sacculina. A', A", Mdf, 

 appendages, c, Pupa of Lerneeodiscus porcellance (after Fr. Muller). F, The six pairs of 

 legs ; Ab, abdomen j A', attaching antennee ; O, eye. 



Olf. (Otion, Cineras Leach.), C. virgata Spengl., frequently attached to ships. 

 C. aurita L., Anelasma Darwin. The stalk is provided with root-like processes, 

 which grow into the skin of Squalida. A. squalicola Loven. 



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 complemental males. Pollicipes cornucopia 

 Leach., Ocean and Mediterranean. Scalpellnm vulgare~Lench., North Sea and 

 Mediterranean. Sc. ornatum Gray, South Africa. Ibla quadrivalvis Cuv., 

 South Australia. J. Cumingii Darw., Philippines. 



