PLATE 35 . 
Fig. 1 & 2. RllYNCHONEELA SULCOPLICATA. 
\ a, b. Ventral and front views. 
1 c. Enlargement of the stria;. 
2 a, b, c, d. Undetermined forms of Rhynchoneula. 
Fig. 3 — 5, & 6 a - y. Rhynchonella Formosa. 
3, 4 abed e f, & 5, may be young forms of R. formosa, possessing some characters not observed 
in authentic specimens of that species, but approaching figures 6/, g, h. 
6 a - e. Ventral, dorsal, profile, and front views of several individuals of the typical form, 
with strong plications. 
6/- Z. Specimens with finer and more numerous plications. 
6 m - y. Illustrations of specimens which present the ordinary variations of full-grown indi¬ 
viduals, from the Upper Pentamerus limestone. 
