670 CLASS X. 
middle of the shell, and this is very broad, and incised deeply on each side. 
They form the genus Jbacus Leacu ; to it belongs Scyllarus antarcticus 
Fasr., Rumen. |. |. fig. c. 
Family XXX. Anomura (Anomala Larr.). Four antenne 
inserted nearly in the same transverse row, or middle superior ; 
external antennee without scale at the base. Eyes placed on a 
petiole, very often elongate. ‘Two or four posterior feet less by far 
than the rest. Abdominal feet imperfect, small, deficient in some 
of the segments. Lateral appendages of penultimate segment of 
abdomen reflected at the sides, never composing a flabelliform 
pimna. 
Phalanx I. Pagurina (Paguride Bewi). First pair of feet 
didactylous, chelate. Appendages of penultimate segment of abdo- 
men short, composed mostly of two parts, incurved, inserted on 
a short peduncle, not foliaceous. Integuments of abdomen often 
soft, membranous. 
Pagurus Datp., Fasr. Abdomen contorted, membranous, sup- 
plied with thin calcareous lamine scattered in the back. Fourth 
and fifth pairs of feet very short, subequal. 
Pagurus Larr. Middle antenne short, with two very short 
terminal sete. 
Sp. Pagurus Bernhardus Fasr., Cancer Bernhardus L., SWAMMERDAM 
Bijbel der Nat. Tab. x1. Dusmar. Crust. Pl. 30, fig. 2, the hermit-crab ; 
lives in different turbinated shells, when full-grown in the shell of Buc- 
cinum undatum. 
Note.—Add genus Cancellus Epw. 
Compare MILNE EDWARDS Observations sur les Pagwres, &c., Ann. des 
Se. nat. 2e Série vi. 1836, Zool. pp. 257—288, Pl. 13, 14; ejusd. Sur 
quelques nouvelles espéces du genre Pagure, Ann. des Sc. nat. 3ieme Série x. 
1848, Zool. pp. 59—64. 
Cenobita Latr. Middle antenne long, with peduncle elongate 
and two unequal set, one of them long. 
Sp. Cenobita Diogenes LatR., Encycl. méth., Crust. Pl. 284, figs. 2, 3, 
Epwarps Hist. nat. des Crust. Pl. 22, figs. 11—13. 
Birgus Leacu. Abdomen broad, covered above by a tabulate 
calcareous crust, membranous below. Fourth and fifth pairs of 
