NE W CA RBONIFERO US M(fLL VSKS—dlR TV. 735 



EXPLANATION OF I'LATKS. 



ri.ATK XLV. 



Tjiiiiiprctoi. te.rtnmi^, p. 722. 



Tho type specimen in wliicli both valves are retained in position. 

 Fii,^ 1. Left valve showing the shape and surface characters. 



The squamose concentric lines are perhaps a trifle more numerous and closely 

 arranged than shown by tlie figure. 

 2. Right valve. Though iuiperfect, tliis valve shows how <lifferent the surface 

 characters are from those of the left. By a Ijreakiug away of the ujiper 

 portion the hinge plate and cartilage-pit of the other valve are brought to 

 view. 

 ;>. Side view of same showing the unequal convexity of the two valves. 



I'lenrdplKirilld jKifillldxa, p. 72!t. 



The type specimen, a full-grown individual which lias snffcrcil tn souih extent 

 from erosion. 



Fig. 4. View of the anterior en 1. The degree to which the in tnjverted lunulcextends 

 into the cavity of the shell is hardly strongly enough shown, while the 

 sharp angular outline of the lunular area is by no means exaggerated. 

 5. Side view showing right valve. Probably owing to erosion or breakage the 

 posterior-inferior angle in this specimen is more acutely angular than 

 normail. The diagonal ridge between the main angulation and the hinge 

 is quite indistinct in the specimen, and in the figure is represented as too 

 near the latter; its real position is intermediate. 

 6. Specimen seen from aljove. The escutclieon and the intermediate ridges are 

 shown in this view, and the cavity at the anterior end cause<l by the 

 depressed lunule. 



Pl.vte XLVI. 

 Limipeden texanus var. grandicodiituK, j). 723. 



A specimen retaining l)oth valves in conjunctioi:. 

 Fig. 1. Right valve, showing the fine ril)s characterizing this valve. 



2. Left valve, showing the large loose folds and lamellose c<mcentric lines. 



3. Side view, showing relative convexity of the two valves. 



Liiiiiju'cfcti tc.iatiii.f i/), ]). 722. 



Fragment of the upjier portion of a largt; massive left valve. 

 Fig. 4. View of the liinge plate, showing cartilage i)it. The broken eilge to the left 

 of the figure is just beyond the edge of the cartilage [)it, which is therefore 

 represented in its entire dimensions. 



I'lenrophorella papulosa, p. 72! I. 



A young specimen, somewhat more jierfect than the tyju', and, like it, retaining 



both valves in place. 



Fig. 5. Side view of left valve. This specimen shows the manner in which the 

 angular concentric ridges which mark the rest of tlu- surface l»ecome sud- 

 denly obsolete at the umbonal ridge. 



Proc. N. M. vol. xxvii— 03 -51 



