SUBCLASS II 



EUCRUSTACEA— EUCARIDA 



763 



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



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



, . Neocomian. All of these have a more or less 



distinct rostrum and the antennae moderately 

 developed. 



PaUnurina Miinster, from the Lower Lias and 

 Solenhofen Stone, appears to be a member of the 

 Pali)iuridae, a family which has the rostrum 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. Cancrinus Miinster, from Solenhofen, 

 which has the antennae short and very broad, 

 perhaps leads toward the ScyUaridae, in which the 

 antennae form liroad flattened plates. Scyllaridia 



Pit;. 1478. 



Pe.mphix aueurii Desm. Muschfilkalk ; Crailsheim, 



Wiirtemberg. i/i- 



Pi(i. U7'.i. 



Glyphaea fenuiit Oppel. Lithographic Stone ; 

 Eichstiidt, Bavaria. A, Side-view, i/i- -'5, Rostral 

 region enlarged, a, a", First and second pairs oi' 

 antennae ; o, Eye ; s, Antennal scale ; M, Base of 

 second pair of antennae. 



Bell is found 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 group 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 

 throughout the Jura. Enoplochjtia M'Coy; Nyniphaeops Schlilter; Oncoparia Bosquet; 



