BY R. ETHERIDGE, JUXR., AND JOHN MITCHELL. 699 



From the American Devonian species 0. callicera, Hall,* our 

 species is equally distinct. It lacks the long genal spines and 

 large eyes of the former and possesses a greater number of cheek 

 spines. 



It is with the Bohemian species that the Bowning Trilobite 

 seems to correspond best, although it is a broader form than the 

 majoiity of the former, if not indeed of all those allied to it. 



In 0. Leonhardi, Barr., the pleurae are single-spined, in our 

 form double, and the pygidium spines are increased in numljer 

 and are constant. In the former the genal spines are long and 

 acicular, in the latter short and stout, and the courses of the 

 facial sutures are different in the two species. 



From 0. mhinta, Barr., 0. howningensis is at one distinguished 

 by the uniformity of the spines extending from the pygidium of 

 the former, and again by the nature of the pleural and genal spines. 

 It may be said also that the same characters separate our form 

 from 0. Dormitzeri, Barr., and 0. Roeiaeri, Barr. In the latter 

 the backward extension of the genal spine is enormous. 



The description is taken from decorticated specimens. 



Loc. and Horizon — Bowning Creek, near Bowning, Co. Harden, 

 Lower Trilobite Bed — Bowning Series { = RxLme 5ec?s, Jenkins, 

 and Yaas Beds, David) — ? "Wenlock. Coll. — Mitchell. 



Odoxtopleura Rattei, sp.nov. 



(PL L., fig. 7; PI. LI., figs. 8-9; PI. lil, figs. 1-4; PL liil, figs. 1-3.) 



Acidaspsis near A. Leonhardi, Ratte (non Barr.), Proc. Linn. Soc. 

 N.S. Wales, 1887, ii. Pt. 2, p. 99, PL 2, figs. 2-4. 

 Sp. Char. — Body — oval. Cephalic shield or cephalon — Subsemi- 

 circular, a little wider than twice the length, and straight in front. 

 Glabella quadrate, width between eye lobes equals length, 

 including the neck ring, distinctly and evenly granulate, front 

 margin dentate ; central portion suboblong, intensely arched 

 transversely, moderately so from front to back, highest medially 



* Pcd. N. York, 1SS8, vii. t. Wk f. 1-13. 



