762 



ARTHROPODA phylum vii 



Pephricaris Clarke (Fig. 1456). 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. Noväk has shown 

 that of Barrande's three species, Aristozoe regina, Bactropus longipes and Geratiocaris 

 deUlis, the first represents the carapace, the second the last abdominal segment, and 

 the third the telson of one form, A. regina. Devonian ; Bohemia. Species referred 

 to the same genus have been described from the Cambrian of North America and 

 Devonian of Germany and Russia. 



Orozoe and Callizoe Barrande are presumably allied to Aristozoe. Silurian ; 

 Bohemia. Zonozoe Barr, and Solenocaris Young are not Crustaceans. 



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 pf all known parts more or less 

 ßtrongly tuberculated. Upper Devonian ; New York. 



Ptychocaris Noväk. 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 ex- 

 posed 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 Beecher (Fig. 1457). Carapace with truncate 

 posterior margins; ocular node well defined, other cephalic 

 nodes obscure; rostrum narrow and ridged ; surface of valves 

 Tropiöocaris ,üuriru.ta ^IT"^^ '^T^ longitudinal carinae. Abdomen with two 

 Beecher. Chemung exposed Segments, which are sub- cylindrical and without 

 ÄLandToTtrum'""/; 'Pf^^'^' ^P?^^ Devonian and Lower Carboniferous ; Penn- 



(after Hall and Clarke). Sylvania. 



, ..V ^. . ^'^'^'^^^oe Jones and Woodw. Valves of carapace elongate, 

 narrow, and with distinct ocular node; other cephalic nodes wanting. Surface tith 

 fine longitudinal raised Striae. Abdomen unknown. Silurian. 



Suborder D. RHINOCARINA Clarke. 



Family 1. Rhinocaridae Clarke. 



rosierior margin of carapace concave and spined. 



