650 



ARTHROPODA 



SUB-KINGDOM VII 



appear to overlap one another at their bases, and to lie opposite the column of small 

 plates. Caudal extremity terminated by a circular, conical, axial plate, against the 

 sides of which lies the first plate in each column. Middle Devonian. 



Family 3. Lepadidae. Darwin. (Goose Barnacles.) 



Shell pedunculated, composed mainly of the paired terga and scuta, the unpaired 

 carina, and a variable number of small calcareous plates, some of which cover the 

 flexible peduncle ; others take part in the capitn- SRC 



lum. The calcareous plates are never fused. 



Archaeolepas, Zittel (Fig. 1357). Peduncle 



Archaeolepas Redten- 

 bacheri, Opp. sp. Litho- 

 graphic Slates ; Kel- 

 heim, Bavaria, l/i- C, 

 Carina ; R, Rostrum ; 

 S, Scutum ; T, Tergnm. 



FIG. 1358. 



A, Loricula laevissima, Zitt. 

 Senonian ; Diilmen, West- 

 phalia, l/i . , C, L. Syriaca, 

 Dames. Cenomanian ; Le- 

 banon, i/! and 2/j. 



FIG. 1350. 



Pollit-ipes laevissimus, Quenst. Upper Cre- 

 taceous ; Liineburg, Belgium. C, Carina ; L, 

 Lateralia; R, Rostrum (?); S, Scutum. 1/1- 



flattened, the two principal surfaces with four to six, the narrow sides with two 

 columns of small scales. The capitulum is com- 

 posed of triangular scuta, two large trapezoidal 

 terga, a short unpaired carina, and a minute 

 rostrum. Upper Jura. 



Loricula, Sowb. (Fig. 1358). Peduncle 

 squamous. Capitulum with two scuta, two 

 terga, four lateralia, and a very narrow carina. 

 Cretaceous. 



Pollicipes, Leach (Polylepas, Blainv.), (Fig. 

 1359). Capitulum composed of numerous (eigh- 

 teen to one hundred) plates, among which the 

 scuta, terga, rostrum, and 

 carina are distinguishable 

 by their size, Lateralia 

 generally in two columns. 

 Peduncle membranous 

 with minute scales. 

 Upper Jura to Eecent. 



Squama, Stramentum, 

 Logan. Upper Cretaceous 

 (Niobrara) ; Kansas. 



Scalpellum, Leach 



(Figs. 1360-1362). Ca- ScalpellumGallicum> 

 pitulimi With twelve to Hebert. Upper Cretace- 

 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. 



FIG. 1360. 



sc d U 



FIG. 1361. 



Capitulum of Scalpellum fossulum, Darwin. 

 Upper Cretaceous ; Norwich, England. 2 /i- 

 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). 



