Beede.] Carboniferous Invertebrates. 1S3 



PLATE XIV. 



Pseudomonotis kansasenais, (p. 133.) 



1. Left valve of type. Postero-ventral portion crushed, probably giving it 

 undue prominence. The stria* are finer and more crinkly than rep 

 resented in drawing. About natural size. 



La. Outline showing convexity of the same. 



16. Outline showing the convexity of the adult long-hinged forms. 



lc and Id. Young specimen of the long-hinged form, showing different de- 

 grees of development of the hinge and ears. About natural size. 



Paeudomontitia robusfa, (p. 133.) 



'2. Left valve of type. The stri;e are finer and more wavy than represented, 



and the upper third is practically glabrous, only the faintest traces 



of stria' being present. About natural size. 

 2a. Anterior view of the same shell, showing gibbosity and arcuity of shell, 



as well as concentric lines of growth. About natural size. 

 '2h and 2c. Anterior and lateral views of the left valve of a young individual 



of the above shell. About natural size. 



Psr udomonotia hawni equiatriata, (p. 134. > 



3. Left valve of type. A little less than natural size. 



3a and 36. Anterior views of two left valves, showing variation in convexity 

 and indistinctness of beak. About natural size. 



PLATE XV. 



Paeudomonotia hawni. Lobed variety, (p. 132. i 



1. Convex valve, showing the bending of the cost;e and the lobe on the end 



of the shell. All natural size. 

 1". Interior of left valve, showing retractor scars and adductor scar. 

 lh. Outline showing convexity of same, 

 lc. Hinge view of a specimen, showing the indistinctness of the beak and 



the great convexity of the shell. 

 Id . Specimen showing the stronger lobing of the shell. 

 lc. End of outline of a specimen, showing the great convexity of the beak 



in some individuals. 

 if. Hinge view of a specimen, showing the great convexity and the manner 



in which the shell flattens out on the end where the lobe is located. 

 '2. Large, old specimen, showing umbonal region with only the finer stria-. 

 2a. Flat valve of the same specimen, showing the place of attachment to 



foreign object. 



Paeudomonotia kctnaaaenaia, (p. 133.) 



3. Enlargement of the surface of the type, showing the lines of growth ex- 

 tending backward up the furrows and down farther toward the 

 ventral margin on the ridges. 



