TRILOBITA—OPISTHOPARIA. 



149. 0. parvula (Walcott). 

 Glabellar furrows weak. 



(Fig. 1624, a.) 

 Eyes large. 



313 



Ordovicic. 



Fig. 1624. a, Odontopleura parvula ; b, Calymene callicephala, cephalon ; c, d, C. 

 senaria, cephalon. (After Clarke.) 



Trenton of New York, New Jersey and Minnesota. 



LIX. Glaphurus Raymond. 

 Differs from Odontopleura in having 11 or 12 segments to the 

 thorax and a pygidium with spineless margin. There is a single 

 pair of long, narrow, lateral lobes parallel to the large median gla- 



FiG. 1625. Glaphurus pustulatus^ 

 a nearly entire specimen, X 4« 

 (From an unpublished drawing by 

 Raymond. ) 



Fig. 1626. Glaphurus pustulatus, a 

 nearly complete anterior portion, X 2, 

 and pygidium, X 3- (After Raymond.) 



bellar lobe. Eyes small, opposite the anterior half of the glabella. 

 Ordovicic. 



150. G. pustulatus (Walcott). (Figs. 1625, 1626.) Ordovicic. 



