NI 
BIBLIOGRAPHY OF PALM®OZOIC CRUSTACEA 
BARTON (Donald C.)—Continued 
The author places under the family cheirurinae twenty genera divided into two sec- 
tions. 
Group 1. Cheirurinae with plural furrow horizontal, thoracic segment rarely 9, 
generally with 10 or 12. 
Under this group he places: 
Eccoptochile Corda, genotype E. claviger Beyr., with figure. 
Actinopeltis Corda genotvpe 4. globosus Barr, with figure. 
Cyrtometopus Angelin genotype C. clavifrons Dal., with figure. 
Sphaerexochus Beyrich genotype §. mirus Beyr., with figure. 
Anacheirurus Reed genotype 4. Frederici Salt., with figure. 
Pilekia new genus genotype Ch. apollo Bill., with figure in text. 
This is an early Ordovician 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, the ribs terminating in 
long spines. He refers Ch. gracilis Barr. Cyr. foveolatus Ang. and with doubt Ceraurus 
Clintoni Foerste to the genus. 
Nieszkowskia Schm. genotype N. cephaloceras Nieszk., with figure. 
Kawina new genus genotype Ch. vuicans 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 author refers to this genus Ch. prolificus Bill., Ch. mercurius Bill., Pseudo- 
Sphaer. Billingst Raym. and Pseudo-sphaer. approximus Raym. 
Pseudosphaerexochus Schm. genotype P. hemicranium Kut., with figure, includes 11 
species. Cheirurus Paronat Airaghi probably belong here, but the author does not in- 
clude it. 
Placoparia Corda genotype P. Zippei Boeck, with figure. 
The author includes also Calymmene tourneminei Rouault, but does not mention 
P. cambriensis Hicks. 
Area Barr. genotype 4. bohenica Barr., fig. in text. 
The author includes 4. Fritschi Barr., but no mention of A. suecica Olin. 
Prosopiscus Salter genotype P. mimus Salt., with figure. 
Typhloniscus Salter genotype T. Bainii, figure in text. 
Sphaerocoryphe Angelin genotype S. dentata Ang. 
This is a Swedish species, the figure 16 in the text after Schmidt, looks more like 
S. cranium Schm. pl. 8, fig. 7. 
Hemisphaerocoryphe Reed genotype H. pseudo-hemicranium Nieszk., with figure. 
This is an intermediate genus between Cyrtometopus and Sphaerocoryphe. From 
Cyrtometopus this genus can be distinguished by its highly inflated frontal lobe. From 
Sphaerocoryphe it may be distinguished by its obtusely triangular free cheeks and by 
its posterior pair of glabellar furrows, which bend sharply backward instead of ex- 
tending across the glabella. 
The author includes besides the type Metopias aries Eichw. and Cyrt., Rosentali 
Schmidt. 
Group 2. Cheirurinae with constricted pleurae and with diagonal pleural furrows, 
Lehua nov. genotype Ch. vinculum Barr. 
The genus resembles Eccoptochile and Anacheirurus. From the former it is most 
readily distinguished byi 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 type Typhloniscus princeps Reed and Ch. inexpectatus 
Barr. 
