V 



330 Mr. J. W. Kirkby on Permian Entomostraca. 



the dorsal and ventral margins forming a right angle. Lateral 

 contour irregularly lenticular ; greatest diameter one-fourth of 

 height, posteriorly situate. Hinge strong. Flange of left ven- 

 tral margin small, subcentral. 



It is with great pleasure that I name this species after Baron 

 von Schauroth of Coburg, to whose assiduous researches in the 

 Permian rocks of Germany palaeontologists are greatly indebted. 



Found rarely in the fossiliferous limestone of Tunstall Hill. 



Bairdia ? Berniciensis, n. sp. PI. X. figs. 15 & 15 a. 



Length J* inch ; height -Ij inch. 



Carapace subrhomboidal, moderately convex, smooth. Dor- 

 sal margin convex ; anterior slope descending rather more than 

 one-third of height ; posterior slope rather abrupt, descending 

 about half of height, very convex. Ventral margin convex. 

 Anterior extremity obliquely truncate. Posterior extremity 

 rounded or bluntly pointed. Lateral contour sublenticular; 

 greatest diameter posteriorly placed, more than two-sevenths of 

 length. 



This scarce form rather resembles the recent Cythere acuta in 

 marginal outline. 



Not being able to make out the hingement of this species, 

 some doubts may exist as to its really belonging to Bairdia ; but 

 I place it in that group provisionally, until its true affinities be 

 determined. 



EXPLANATION OF PLATE X. 



Fig. 1. Bairdia plebeia, Reuss : right valve ; magnified 23 times. 



Fig. 2. Ditto : left valve of another variety ; magnified 23 times : 2 a, lateral 



contour, with contact-line of ventral margins. 

 Figs. 4 & 4 a. Ditto, var. elongata : left valve ; magnified 23 times. 

 Figs. 5 & 5 a. Ditto, var. Neptuni : left valve ; magnified 30 times. 

 Figs. 7 & 7 «. Ditto, var. compressa : right valve ; magnified 25 times. 

 Figs. 3 & 3 a. Bairdia ventricosa, n. sp. : right valve ; magnified 28 times. 

 Figs. 6 & 6 a. Bairdia Reussiana, n. sp. : right valve; magnified 26 times. 

 Figs. 8 & 8 a. Bairdia Kingii, Reuss : right valve ; magnified 34 times. 

 Figs. 9, 10, & 9a. Bairdia mucronata, Reuss: right valves; magnified 



28 times. 

 Figs. 11 & 11 a. Bairdia mucronata? : left valve; magnified 28 times. 



Figs. 12 & 12 a. Bairdia ■ , n. sp. ? : right valve ; magnified 29 times. 



Figs. 13 & 13 a. Bairdia reniformis, n. sp. : right valve; magnified 40 



times. 

 Figs. 14 & 14 a. Bairdia Schaurothiana, n. sp. : left valve; magnified 28 



times. 

 Figs. 15 & 15 a. Bairdia Berniciensis, n. sp. : right valve; magnified 33 



times. 



[The whole of these are from the fossiliferous limestone of Tunstall Hill.] 

 [To be continued.] 



