BIBLIOGRAPHY OP PAL/EOZOIC 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 tin- sand blast for tlic (lpv('lo[)m('iil of Trilobites. 



Geol. Mag., Decade 4, vol. 1, 1894, p. 553. 



Berkey (Charles P.) (Jcoloiiy of the St. Croix DaUes. 



Am. Geol., vol. 21, pp. 270-294, plates 18-21, 1898. 



The author includes and illustrates the followine;- Trilobites : 



Agranltis convexns Whitf., with var. A and B, ./. Iiemisplier'uus n. sp. 



Ptychoparia calymeuoides (Whitf.). ']"he 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 sliield. 

 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 remo\ed 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. 



ClieUoccphalus St. Croixensls n. sp. ( Facial suture like Cyclognathus.) 



The author also figures Dikelocfplialus misa Hall, referred by Walcott to the genus 

 Amomocare. 



Berjeron (J.) Notes Palaeontoloj^iiiiues. 



Bull. Soc. Geol. France, 3rd sen, vol. 23, 1895, p. 465, plates 4-5. 



Calymenopsis Filaco-vi n. gen. et sp. Ampliion_ Escortl n. sp. 



Dicellocephalus? J'illerhrurii n. sp. .Isaplielina Barroisl Mun. Ch. et J. 



Berg. Oi^ytritT I.ig/iieresti n. sp. .¥,i^Iina Sicardi n. sp. .'F.t^Hna f Savirii n. sp. 

 Dictyoceplialus Vlllerhruni n. gen. et sp. 



The author remarks that the new genus (Jtilymriiopsis, "11 est caracterise par la 

 presence de pointes genales par la forme de ia grande suture; par le presence de cavites 

 dans le sillon anterieur, cavites qui semblent etre comparable a cellos du limbe des 

 TriniK Iriis ; par la presence d'uiie bande oculaire; enfin par la forme en pyramide des 

 joues mobiles." 



Notes PahM)nt()h)i;i([iie — Criistaces iv etude de (|UeI<|ues Trilo- 

 bites de Chine. 



Bull. Soc. Geol. France, 3rd sen, vol. 27, 1899, pp. 499-515. Plate. 



Calymmene f sinensis n. sp. This species forms the genotype of Black-acldrria Walcott, 

 new genus. Agnosfiis Dou-villei n. sp. Olenoides Lehlanti n. sp. 



Dicellofcphalus? sinensis n. sp. Walcott Cambrian Fauna of Cliina, p. 35, places 

 this species imder his new genus Damesella. 



Drepnnura Premesnilli n. gen. et sp. Compare liaf/iynoliis. holnpygn Hall. 



Artliricoceplialus Chaiiveaui n. gen. et sp. 



"La caracteristi(|ue de cette forme est la structiu'e annelee de tout son corps, et en 

 particulier de la glabella. Celle-ci sembic formee d'anneaux superposes et a ce point 

 de vue seulement elle rappelle la disposition caracteristi(]ue du genre Olrnellus." 



