SUBCLASS II 



EUCRUSTACEA— CIRRIPEDIA 



745 



Pollicipes Leacli (Polylepas Blainv.). Capitulimi coinposed of numerous (eighteen 

 to one hundred) plates, anioiig wliicli the scuta, terga, rostrum and carina are dis- 



A 



Capitulum of Scalpellum fossulum Darwin. 

 Upper Cretaceous ; Norwich, England. 2/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 fossulum Darwin. 

 Upper Cretaceous ; England. 

 Carina much enlarged (after 

 Darwin). 



Fkj. 1444. 



Lepas anatifera Linn. 

 Recent ; Mediterranean. C, 

 Carina ; P, Peduncle ; S, 

 Scutum ; T, Tergum. 



tinguishable by their size. Lateralia generally in two columns. Peduncle mem- 

 branous with minute scales. Upper Jura to Recent. Doubtfully recorded from 

 the Silurian. 



Squama, Stramentum Logan. Upper Cretaceous (Niobrara) ; Kansas. 



Scalpellum Leacli (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. 



Le2}as Linn. (Fig. 1444). Peduncle naked. 

 Capitulum consisting of only two very large tri- 

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

 Pliocene and Recent. 



Poecilasma Darwin. Capitulum consisting of 

 three, five or seven pieces. Carina extending only to 

 base of the terga, the 

 Scuta sub-oval. Tertiary and Recent. 



Fig. 1445. 

 BrachyUpas naissanti (Hubert) ( = 



latter sometimes wanting. P^M^^s^lo,vissim^Lsqx^en^t.)._ Upper 



Rostrum ; s, Scutum ; 

 l, upper latus ; t, tergum ; c, carina ; i.s., 

 imbricating plates. Vi (after Withers). 



Family 4. Brachylepadidae H. Woodward. 



Shell sessile, with a large numher of plates, the arrangement of which indicates a 

 transition from the Lepadidae towards the Balanidae. 



The Single known genus Brachylepas H. Wood ward (Fig. 1445) occurs in the 

 Upper Senonian of England and the continent of Europe. 



