PLATE 
Fig. 1 & 2. 
Stropiiodonta leavenworthana. 
Page 
189 
1 a. b, c. Ventral, dorsal, and profile views of an entire specimen. 
2 a, b. Dorsal and profile views of a full-grown individual. 
2 e. Enlargement of the fine equal striae. 
Fig. 3. 
Stropiiodonta beckii. 
191 
3. A cast of the interior of the dorsal valve. 
Fig. 4, 5 & 7. 
Stropiiodonta punctulifera. 
188 
4 a, b. The interior and profile view of the dorsal valve. 
4 c. Profile view of a mere gibbous specimen. 
5 c. Cardinal view, showing the area enlarged. 
7 c. Enlargement of striae which are scarcely exfoliated, showing pustulose points, some of 
which are punctate at their extremities. 
Fig. 6. Stropiiodonta geniculata. 483 
6 a, b. Ventral and dorsal views of a small individual. 
6 c. Profile of the same. 
Fig. 7 a - g. Ortiiis stropiiomenoides. 177 & 481 
7 a. An imperfect dorsal valve of this species. 
7 b. Enlargement of the surface striae from 7 a. 
7 c. A cast of the dorsal valve, showing the vascular and muscular impressions in a great 
degree of perfection. 
7 d. A similar specimen, showing variations in the markings. 
7 g. A similar cast, showing the muscular impressions, and the vascular impressions of the 
ovarian spaces. 
7 /. A cast of the ventral valve, showing the muscular and vascular impressions. 
Figures 2 a, b and e, and fig. 3, were drawn by Mr. F. B. Meek; the remainder, by Mr. Whitfield. 
The upper figure of 3 was intended as a correction (subsequently added ) of the erroneous form of 
crenulations in the hinge of the one below. 
