BIPLIOGRAPHY OF PALAMOZOIG CRUSTACEA 125 
WALCOTT (Charles D.)—Continued 
contracts in front of the pits in the dorsal furrow; also that the pleural lobes of the 
pygidium of Olenoides have broad, shallow furrows, with sharp, narrow ridges sep- 
arating them; while those of Dorypyge have narrow furrows, with broad, rounded 
ridges between them. ‘Type D. richthofent Dames, 1883. 
Dorypyge bispinosa Walc., D. richthofeni Dames, D. richthofent laevis Walc. 
Genus Teinistion Monk, 1903. 
The genus is characterized by the peculiar glabella, narrow frontal margin and 
spinose pygidium. ‘Type T. lansi Monke. 
Teinistion alcon Walc., T. lansi Monke, T. sodeni Monke, T. typicalis Walcott, de- 
scribed under the genus Dorypygella by Walcott, 1905. 
Genus Stephanocare Monke, 1903, syn. Damesella Chione Walcott, 1905. 
Stephanocare Monkei Walcott, 8. richthofeni Monke, syn., D. chione Walc., 8. sinensis 
Bergeron, S. sp. undt. 
Genus Blackwelderia Walcott, 1906. 
The genus differs from Teinistion in the character of the associated free cheeks and 
pygidia, and the frontal limb of the cephalon; from Dorypyge in the form of the gla- 
bella and free cheeks. ‘he thoracic segments are alike in the two genera, and the 
pygidia are of the same type. 
Blackawelderia alastor Walc., described under Dorypygella in 1905, B. cilix Walc., 
described under Olenoides ? in 1905, B. sinensis Bergeron described under Calymmene ? 
in 1899, 
Genus Damesella Walcott, 1905. Type D. blackwelderi Wale. 
The author remarks that in Damesella and Stephanocare the facial suture cuts the 
posterior lateral margin outside of the genal angle, so as to leave the genal angle on 
the fixed cheeks, and at the same time the spine, corresponding to the genal spine in 
other genera of the order Proparia, on the free cheek, so Beecher’s classification should 
be modified in relation to the exceptions made in these genera. 
Damesella bellagranulata Wale. D. blackawelderi Walc., D. brevicaudata Walc., D. 
sp. undt. 
Genus Drepanura Bergeron, 1899, Genotype ). premesnili Berg. 
Drepanura ketteleri Monke, D. premesnili Bergeron. Ptychoparia Corda, 1847. 
In this memoir the genus is restricted to species having the characteristic of Ptycho- 
paria striata Emmrich. 
Ptychoparia axlis Wale. P. granosa Wale. P. impar Wale. and var. P. kochibei 
Wale. P. ligea Wale. P. lilia Walc., P. tolus, P. typus Dames. 
Subgenus Ptychoparia (Emmrichella) Walcott, 1911. 
Genotype Ptychoparia theano Wale. 
The subgenus differs from the following genera: 
1. Ptychoparia in its smooth glabella and larger palpebral lobe. 
2. Liostracus in having an arched or nearly flat frontal limb and rim and more 
convex cranidium. 
3. Conokephalina in its smoother glabella and wider fixed cheeks. 
4. Anomocare in its smoother glabella and distinct palpebral ridge, and propor- 
tionately shorter eye-lobes and glabella. 
The author described under this subgenus the following species: 
Ptychoparia (Emmerichella) bromus Wale. P. (E.) constricta Walc., P. (E.) eriopia 
Wale. P. (E.) mantoensis, P. (E.) theano Walcott. 
Genus Liostracus Angelin, 1854. Genotype L. aculeatus. 
Two species which the author classes under the subgenus Emmrichella—mantoensis 
and constricta—approach most nearly to the genus Liostracus. 
Genus Conokephalina Brégger, 1886. Genotype C. ornatus Brégger, 1877. 
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