226 NEW YORK STATE MUSEUM 



Genus bronteus Goldfuss 



[Ety. : mythologic name] 



(1839. Nova act. phys. mcd. caes. Leop. Carol. Nat. curios. 19 :36c) 



Dorsal shield broadly elliptic, with the cephalon less than one 

 third the entire length; glabella rapidly expanding in front, with 

 faint Jobations. Thorax of 10 segments. Pygidium longer than 

 cephalon or thorax, with a short axis and radiating furrows extend- 

 ing; from it across the broad limb. 'Margin generally entire. 



c 



Fig. 158 Bronteus niagarensis; pygidium 



Bronteus Jiiagarensis Hall (Fig. 158) (1852. Pal. N. Y. 2:314, 

 pi. 70) 



Distinguishing characters. Pygidium only known; broad and 

 somewhat semicircular; short axis and from six to nine long curv- 

 ing furrows or sulcations on either side of the center. 



Found in " a large fragment of limestone in che Niagara river 

 below the Canada fall " (Hall). 



Order phyllocarida Packard 1 



Crustacea with the body composed of five cephalic, eight thoracic, 

 and two to eight abdominal segments. Head and thorax covered 

 by a thin chitinous or semicalcareous single or bivalved shell or 

 carapace. A narrow movable plate or rostrum lies in front of the 

 caparace. Two pairs of antennae and stalked compound eyes 

 present. Thoracic segments with soft leaf-like legs. Abdomen 

 often ending in spiniform telson, provided with lateral spines. 



1 This section was revised by Prof. John M. Clarke, who also prepared the 

 synopsis of species and synonymy. 



