656 



ARTHROPODA 



SUB-KINGDOM VII 



spines on their surface and posterior margins. Telson and cercopods are spines of un- 

 equal size. Middle and Upper Devonian ; North America. 



Pephricaris, Clarke (Fig. 1374). Carapace as in the last, 

 but without the lateral carinae. Margins provided with a 

 single row of long recurving spines. Three or four abdominal 

 segments protrude beyond the carapace, the last two having 

 a single pair of long spines. Upper Devonian ; New York. 



Aristozoe, Barr. (Bactropus, Barr.). Carapace with cephalic 

 node well developed, but without lateral carinae. But one 

 abdominal segment known, and this is very long, cylindrical, 

 with an intricate hinge at the articulation with the caudal 

 spines. Telson a long spine with a row of spinules on each 



lateral edge. Novak has 

 shown that of Barrande's 

 three species, Aristozoe 

 re gin a, Bactropus 

 longipes, and Ceratiocaris 

 debilis, the first repre- 

 sents the carapace, the 

 second the last abdominal 

 segment, and the third 

 the telson of one form, 

 A. regina. Devonian ; 

 Bohemia. Species re- 

 ferred to the same genus 

 have been described from 

 the Cambrian of North 



Pephricaris hwripiiata Clarke. Chemung America and Devonian 

 Group ; Alfred, New York. 1/1 ( af ter , 



Clarke). of Germany and Eussia. 



Orozoe, Callizoe, 

 Silurian ; Bohemia. Zonozoe, 



FIG. 1373. 



Echinocaris punctatu, Hall sp. 

 Hamilton Group ; Pratt's Falls, 

 New York. 1/1 (after Beecher). 



FIG. 1374 



Barrande, are presumably allied to Aristozoe (Novak). 

 Barr., and Solenocaris, Young, are not Crustacean. 



Eleutherocaris, Clarke. Carapace elongate-subquadrate, truncate in front, incurved 

 behind ; rostrate (?). Broad, obscure nodes in the cephalic region ; lateral carinae 

 single, anterior, and very short. Body segments unknown ; caudal plate with a 

 slender telson and cercopods of equal length. Surface of all known parts more or less 

 strongly tuberculated. Upper Devonian ; New York. 



Ptychocaris, Novak. Valves elongate-subquadrate, posterior margin sloping or 

 slightly incurved. Cephalic region with a cluster of small nodes in 

 front, and two larger nodes behind. Lateral region with a single 

 long sigmoid carina. Surface striated with raised longitudinal 

 lines. Abdomen and tail unknown. Lower Devonian ; Bohemia. 



Elymocaris, Beecher. Surface of carapace evenly convex, 

 smooth, without lateral carina ; hinge line long ; posterior 

 margin convex ; cephalic nodes obscure ; rostrum not observed. 

 Abdomen with two exposed segments ; caudal plate short, with 

 broad, convex, rapidly tapering telson and two cercopods, 

 setigerous on their inner margins. Middle Devonian ; New 

 York. Upper Devonian ; Pennsylvania. 



Tropidocaris, Baecher (Fig. 1375). Carapace with truncate Warren, Penn. Carapace 

 posterior margins ; ocular node well defined, other cephalic nodes Hall and Clarke). 

 obscure ; rostrum narrow and ridged ; surface of valves with several 



strong longitudinal carinae. Abdomen with two exposed segments, which are sub-cylindri- 

 cal and without spinules. Upper Devonian and Lower Carboniferous ; Pennsylvania. 



FIG. 1375. 



Tropidocaris Mcarinata, 

 Beecher. C h e m u n g ; 



