SUBCLASS II 



EUCRUSTACEA— CIRRIPEDIA 



745 



Pollicipes Leach (Polylepas Blainv.). Capitulum composed of numerous (eighteen 

 to one hundred) plates, among which the scuta, terga, rostrum and carina are dis- 



ci u 



Fig. 1442. 



Capituhim of Scalpellum fossulum Darwin. 

 Upper Cretaceous ; Norwich, B^ngland. s/j. 

 C, Carina ; L, Laterale superius (upper latus) ; 

 R, Rostrum ; S, Scutum ; T, Tergum ; cl, 

 Carino -.latus ; il, Infra - median latus ; rl, 

 Rostral latus ; sc, Sub-carina ; sr, Sub-rostrum 

 (after Darwin). 



Fig. 1443. 



Scalpellum fossidumDavvim. 

 Upper Cretaceous ; England. 

 Carina much enlarged (after 

 Darwin). 



Fig. 1444. 



Lepas anatifera Linn. 

 Recent; Mediterranean. C, 

 Carina ; P, Peduncle ; S, 

 Scutum ; T, Tergum. 



Lateralia generally in two columns. Peduncle mem- 



UpiJer Jura to Recent. Doubtfully recorded from 



tinguishable by their size, 

 branous with minute scales, 

 the Silurian. 



Squama, Stramentum Logan. Upj)er Cretaceous (Niobrara) ; Kansas. 



Scalpellum Leach (Figs. 1441-1443). Capitulum with twelve to fifteen pieces. 

 Terga and scuta much larger than in Pollicipes and of 

 very characteristic form. Carina narrow, long, with 

 arched surface. Peduncle covered with fine scales, 

 rarely naked. Cretaceous to Recent, and doubtfully 

 recorded from the Silurian. 



LejMS Linn. (Fig. 1444). Peduncle naked. 

 Capitulum consisting of only two very large tri- 

 angular scuta, two small terga, and a single carina. 

 Pliocene and Recent. 



Poecilasma Darwin. Capitulum consisting of Fig. 1445. 



three, five or seven pieces. Carina extending only to BrachyUpas naissanti (Hebert) (= 

 base of the terga, the latter sometimes wanting. ^r1utS,s"ttSmr'^ScxS- 



Scuta sub-oval. Tertiary and Recent, ;, upper latus ; f, tergum ;c, carina ; t.s 



imbricating plates. Vi (after W ithers). 



Family 4. Brachylepadidae H. Woodward, 



Shell sessile, loith a large number of plates, the arrangement of which indicates a 

 transition from the Lepadidae towards the Balanidae. 



The single known genus Brachylepas H. Woodward (Fig. 1445) occurs in the 

 Upper Senonian of England and the continent of Europe. 



