BTBLIOORAPITY OP PAI..EOZOIf' ORUSTACEA / 



BARTO N ( Donald C.)— Continued 



The author places under tlie family cheiruriiiae twenty genera divided into two sec- 

 tions. 



Group I. Cheirurinae with plural furrow horizontal, thoracic segment rarelv 9, 

 generally with 10 or 12. 



Under this group he places: 



Eccoptochile Corda, genotype E. clavigrr \'>t\v., with figure. 



Actinopeltis Corda genotype A. ^lohusiis Barr, with figure. 



Cyrtometopus Angelin genotype C. cla-vifrons Dal., with figure. 



Sphaerexochus Beyrich genotype 5'. rnirus Beyr., with figure. 



Anachcirurus Reed genotype .7. Frederic! Salt., with figure. 



Pilekia new genus genotype (!/i. apollo Bill., with figure in text. 



This is an early Ordo\ician genus unlike the Cheirurinae. The author figures the 

 glabella, which contracts forwards with three pair of glabellar furrows; pygidium 

 composed of 4 complete segments and a terminal axial plate, tiie ribs terminating in 

 long spines. He refers C.h. gracilis Barr. Cyr. foveolatus Aug. and with doubt Ceraurus 

 CJintoni Foerste to the genus. 



Nieszkowskia Schm. genotype A', ceplinlocerns Nieszk., with figiu'e. 



Kawina new genus genotype (Ai. 'vtticans Bill., fig. of head in text. 



The glabella large and composing one-half of the head strongly swollen, and with 

 a tendency for a faint hump, at the posterior. Three pairs of glabellar furrows, facial 

 suture running almost parallel to the sides of the glabella, and cutting the border at 

 the genal angles or slightly in towards the axis. Genal angles without spines. 



The authoi- refers to this genus Cli. prolifieits Bill., (Ai. mercuriits Bill., Pseudo- 

 spliaer. BiU'utgsi Raym. and Pseudo-spliaer. approx'nnus Raym. 



Pseudosphaerexochus Schm. genotype P. Iiem'uraii'iuin Kut., with figure, includes 11 

 species. Clieirurus Paronai Airaglii probably belong here, but the autiior does not in- 

 clude it. 



Placoparia Corda genotype /-•. Zippe'i Boeck, with figure. 



The author includes also Calymmene tourneminei Rouault, but does not mention 

 P. camhriensls Hicks. 



Area Barr. genotype ./. bolieiiicn Barr., fig. in text. 



The author includes /. Frh.uhi Barr., but no mention of A. suecica Olin. 



Prosopiscus Salter genotype /'. mimus Salt., with figure. 



Typhloiiiscus Salter genotype T. Uairiii, figure in text. 



Sphaerocoryphe Angelin genotype S. deniata Ang. 



This is a Swedish species, the figure 16 in the text after Schmidt, looks more like 

 S. cranium Schm. pi. 8, fig. 7. 



Hemisphaerocoryphe Reed genotype //. pseiido-lieinicranium Nieszk., with figure. 



This is an intermediate genus between Cyrtometopus and Sphaerocoryphe. From 

 Cyrtometopus this genus can be distinguished by its highly inHated frontal lobe. From 

 Sphaerocoryphe it may be distinguished by its obtusely triangular free cheeks and bv 

 its posterior pair of glabellar furrows, which bend sharply backward instead of ex- 

 tending across the glabella. 



The author includes besides the t\ pe Mctopicis aries Eichw. ami Cyrt., Rosentali 

 Schmidt. 



Group 2. Cheirurinae ^villl constricted pleurae and with diagonal pleural furrows, 

 Lehua nov. genotype Cli. ■vinculum Barr. 



The genus resembles Eccoptochile and Anacheirurus. From the former it is most 

 readily distinguished by its lack of eyes or, if present, situated far forward, and by 

 the diagonal pleural furrow, and by the slender spine-like termination of the pleurae. 



The author includes besides the tvpe Typliloniscus princeps Reed and CAi. inexpectatus 

 Barr. 



