SÜBCLASS II 



EUCRUSTACEA— EUCARIDA 



763 



Oppel is Jurassic. Scajjheus and Preatya Woodward are Liassic. Mecochirus Kef. 



(Fig. 1477) is foimd in the Middle and Upper Jura, and Meyeria M'Coy, in tlie 



Neocomian. All of these have a more or less 

 distinct rostruni and the antennae moderately 

 developed. 



Palinurina Münster, froni the Lower Lias and 

 Solenhofen Stone, appears to be a member of the 

 Palinuridae, a family which has the rostriim sup- 

 pressed and the antennae very stout. Podocrates 

 Geinitz, from Upper Cretaceous and Eocene is 

 hardly to be distinguished from the Recent Linu- 

 parus Gray. Gancrinus Münster, from Solenhofen, 

 which has the antennae short and very broad, 

 perhaps leads toward the Scyllaridae, in which the 

 antennae form broad flattened plates. Scyllaridia 



Fig. 1478. 



Pf.mphix .t)imrii Desm. Muschelkalk ; Crailsheim, 

 Würtemberg. i/i. 



Fig. 1479. 

 Glyphaea tenuis Oppel. Lithographie Stone ; 

 Eichstädt, Bavaria. A, Side-view, i/i- ß, Rostral 

 region enlarged. a, a", First and second pairs of 

 antennae ; o, Eye ; s, Antennal scale ; f<t, Base of 

 second pair of antennae. 



Bell is foLind in the Gault and London Clay, while the Recent Scyllarus Fabr. first 

 appears in the Chalk. 



§ 2. AsTACURA. Lobsters and Crayfishes. 



This section comprises only the tribe Nephropsidea (Astacidea) including the true 

 Lobsters and Crayfishes. In these, the rostrum is of moderate size, the carapace is 

 free from the epistome, and the exopodite of the uropods is divided by a suture. 

 The first three pairs of legs are chelate and the first pair is greatly enlarged. 



The earliest member of this groiip is Eryma v. Meyer (Fig. 1480), found in the 

 Lias, and also occurring, together with Pseudoastacus, Stenochirus and Etallonia Oppel, 

 in the Solenhofen limestone. Isolated chelae of Magila (Fig. 1481) are abundant 

 throiighout the Jura. Enoploclytia M'Coy; Nijmphaeops Schlüter; Oncoparia Bosquet; 



