BIBLIOGRAPHY OF PALAOZOIC CRUSTACEA 13 
The author remarks the trilobites may be briefly described as fixed specialized stages 
in the evolution of the Crustacea, from an annelidan ancestor, with its mouth bent 
round ventrally, so as to use its parapodia as jaws. 
Application of the sand blast for the development of Trilobites. 
Geol. Mag., Decade 4, vol. 1, 1894, p. 553. 
Berkey (Charles P.) Geology of the St. Croix Dalles. 
Am. Geol., vol. 21, pp. 270-294, plates 18-21, 1898. 
The author includes and illustrates the following Trilobites: 
Agraulus convexus Whitf., with var. A and B, 4. hemisphericus n. sp. 
Ptychoparia calymenoides (Whitf.). The genotype of Menomonia new genus by 
Walcott, 1916. 
Cheilocephalus n. gen. 
The author figures the glabella and fixed cheeks. Cephalic shield semi-circular, 
strongly convex, about equal to one-fourth part of a spheroid (front limb), formed by 
a narrow ring projecting at a right angle beyond the general surface of the shield. 
Glabella broad, convex anteriorly, slightly convergent and reaching to the narrow 
marginal rim; surface nearly smooth with two pairs of scarcely perceptible furrows; 
marginal grooves not strongly marked; faint occipital ring, but more strongly marked 
on the cheeks. Fixed cheeks, broad and conforming to the general spherical outline; 
the posterior margin developed in a spine-like projection a little removed from the 
glabella. Eyes a little anterior to the middle and remote from the glabella. Facial 
sutures extend from the eyes forward almost parallel to the side of the glabella and 
backward, with a double curve to the genal angle. 
Cheilocephalus St. Croixensis n. sp. ( Facial suture like Cyclognathus.) 
The author also figures Dikelocephalus misa Hall, referred by Walcott to the genus 
Amomocare. 
Berjeron (J.) Notes Palaeontologiques. 
Bull. Soc. Geol. France, 3rd ser., vol. 23, 1895, p. 465, plates 4-5. 
Calymenopsis Filacovi n. gen. et sp. Amphion Escorti n, sp. 
Dicellocephalus? Villerbruni n. sp. Asaphelina Barroisi Mun. Ch. et J. 
Berg. Ogygia Lignieresti n. sp. A2glina Sicardi n. sp. glina 2? Savini n. sp. 
Dictyocephalus Villerbruni n. gen. et sp. 
The author remarks that the new genus Calymenopsis, “Il est caracterise par la 
presence de pointes genales par la forme de la grande suture; par le presence de cavites 
dans le sillon anterieur, cavites qui semblent etre comparable a cellos du limbe des 
Trinucleus; par la presence d’une bande oculaire; enfin par la forme en pyramide des 
joues mobiles.” 
Notes Paléontologique 
bites de Chine. 
Bull. Soc. Geol. France, 3rd ser., vol. 27, 1899, pp. 499-515. Plate. 
Calymmene 2 sinensis n. sp. This species forms the genotype of Blackwelderia Walcott, 
new genus. Agnostus Douvillei n. sp. Olenoides Leblanci n. sp. 
Crustacés iv étude de quelques Trilo- 
Dicellocephalus? sinensis n. sp. Walcott Cambrian Fauna of China, p. 35, places 
this species under his new genus Damesella. 
Drepanura Premesnilli n. gen. et sp. Compare Bathynotus. holopyga Hall. 
Arthricocephalus Chauveaui n. gen. et sp. 
“La caracteristique de cette forme est la structure annelee de tout son corps et en 
particulier de la glabella. Celle-ci semble formee d’anneaux superposes et a ce point 
de vue seulement elle rappelle la disposition caracteristique du genre Olenellus.” 
