650 ARTHROPODA SUB-KINGDOM VII 
appear to overlap one another at their bases, and to le 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 wapaired 
carina, and a variable number of small calcareous plates, some of which cover the 
flexible peduncle ; others take part in the capitu- 
lum. The calcareous plates are never fused. 
Archaeolepas, Zittel (Fig. 1357). Peduncle 
S 

Fic. 1357. 
Archaeolepas Redten- Fia. 1358. 
bacheri, Opp. sp. Litho- A, Loricula laevissima, Zitt. 5Q 
graphic Slates; Kel- Senonian; Diilmen, West- HR Eay Ti 
heim, Bavaria. 1/;. C, phalia. 1/;, B,C, L. Syriaca, Pollicipes lauevissimus, Quenst. Upper Cre- 
Carina; &, Rostrum 5 Dames. _Cenomanian; Le- taceous ; Liineburg, Belgium. C, Carina; L, 
S, Seutum ; 7, Tergum. banon. 1/; and 2/;. Lateralia; R, Rostrum(?); 8, Seutum. 1/3. 
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, Blainy.), (Fig. 
1359). Capitulum composed of numerous (eigh- 
teen to one hundred) plates, among which the 
seuta, terga, rostrum, and 
carina are distinguishable 
by their size. Lateralia 
generally in two columns. 
Peduncle | membranous 
with minute scales. 
Upper Jura to Recent. 
Squama, Stramentum, 
Logan. Upper Cretaceous 
(Niobrara) ; Kansas. 
We 

Fia. 1361. 
Capitulum of Sealpellum fossulum, Darwin. 
Scalpellum, Leach Upper Cretaceous; Norwich, England. “h. 
‘ios, C -1362 Ve _ C, Carina; L, Laterale superius (upper latus) ; 
(Figs 1360 136 ). Ca Scalpellum Gallicum, R, Rostrum ; S, Scutum; 7, Tergum; cl, 
pitulum with twelve to Eebeg Upper Cretace- Carino-latus; i, Infra-median latus; rl, 
> f. bi Sa p ous; Meudon, near Paris. Rostral latus; se, Sub-carina ; sr, Sub-rostrum 
fifteen pieces. Ter ga and 2/) (after Hebert). (after Darwin). ; 
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. 

Fic. 1360. 
ae 

yy. Se 
