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 
iY, shown that of Barrande’s 
Se three species, Aristozoe 
regina, 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. reyina. » Devonian ; 
Bohemia. Species re- 
ferred to the same genus 
have been described from 

Fia. 1373. Fic. 1374 the Cambrian of North 
Echinocaris punctata, Hall sp. Pephricaris horripilata, Clarke. Chemung America Yevoni 
Hamilton Group ; Pratt’s Falls, Group; Alfred, New York. 1/; (after _ and Der ae 
New York. 1/; (after Beecher). Clarke). ot Germany and Russia. 
Orozoe, Callizoe, 
Barrande, are presumably allied to Arzstozoe (Novak). Silurian; Bohemia. Zonozoe, 
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 “tsi 
York. Upper Devonian ; Pennsylvania. : Tropidonany ae 
Tropidocaris, Beecher (Fig. 1375). Carapace with truncate Warren, Penn, Carapace 
: : : . ; : and rostrum. 1/; (after 
posterior margins ; ocular node well defined, other cephalic nodes all and Clarke). 
obscure ; rostrum narrow and ridged ; surface of valves with several 
strong longitudinal carinae. Abdomen with two exposed segments, which are sub-eylindri- 
cal and without spinules. Upper Devonian and Lower Carboniferous ; Pennsylvania. 

Fig, 1375. 
