CIRRIPEDIA. 295 



Sub-order Verrucid^. 



Sessile. Shell, asymmetrical, with the rostrum and carina united 

 on one side with scuta and terga, which are moveable on the other 

 side of the shell, but not furnished with a depressor muscle. 



Genus Verruca. 



Sub-order Lepadid^. (Barnacles.) 

 Pedunculated. Peduncle, flexible, provided with muscles: scuta 



and terga, when present, not furnished with depressor muscles : other 



valves, when present, not united into one immoveable ring. 



Genera Lepas, Pcecilasma, Dichelaspis, Oxynaspis, Conchoderma 



{Otion and Ci7ieras), Alepas, Anelasma, Alcippe, Ibla, Scalpellum, 



PolUcipes Lithotrya. 



Order II. Abdominalia. 



Carapace, flask-shaped ; body formed of one cephalic, seven 

 thoracic, and three abdominal segments, the latter bearing three pairs 

 of cirri : the thoracic segments without limbs. Mouth, with the 

 labrum greatly produced, and capable of independent movements : 

 oesophagus armed with teeth at its lower end. Larva, firstly egg- 

 like, without external limbs or an eye ; lastly binocular, without 

 thoracic legs, but with abdominal appendages. 



Genus Cryptophialus. (This singular genus appears to be allied to 

 the Alcippe, like which it is a burrower.) 



Order III. Apoda. 



Carapace, reduced to two separate threads, serving for attachment. 

 Body, consisting of one cephalic, seven thoracic, and three abdominal 

 segments, all destitute of cirri. Mouth suctorial, with the mandibles 

 and raaxillee placed back to back, enclosed in a hood formed by the 

 union of the labrum and palpi. 



Genus Proteolepas. (This aberrant genus is parasitic on Alepas 

 cornuta : it makes the nearest approach, 

 among the Cirripedia, to the Suctorial 

 Epizoa ) 



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