PLATE 30. 
Fig. 1. 130. 4. Linevta arrenvata? (Pag. 94.) 
1 a, is the largest individual of this species yet seen. 1b, A specimen of the ordinary size. 
Fig. 2 a, b, ¢ 131. 5. Linevza picinirormts. (Pag. 95.) 
Fig. 3 a, b. 132. 6. Lineuta mQuatis (4 variety of the last species?). (Pag. 95.) 
Fig. 4. 133. 7. LincuLa QUADRATA. (Pag. 96.) 
4a. A specimen of the ordinary size; the shell partially exfoliated, and presenting the strong radiating strie 
along the centre. 
4b, View of the edge of the shell, with the two valves closed. It appears slightly inequivalve from compression. 
4c. A specimen of larger dimensions, from which the shell is partially exfoliated. 
Fig. 4. 134. 8. Lineuta ELONGATA. (Pag. 97.) 
Fig. 6. 135. 9. Lineuna curta. (Pag. 97.) 
6 a. Specimen from the Utica slate. 6 6. Specimen from the Trenton limestone. 
Fig: 7. 136. 10. Linevna osrtusa. (Pag. 98.) 
Fig 
Fig 
Fig 
Fig 
7a. A very perfect specimen of large size, giving the exact form of the shell : radiating strie scarcely visible. 
7b. Another specimen, the form not quite so perfect as the last, but the radiating strie more distinctly visible. 
7c. A smaller individual of the same species. 
8; 137. 11. Linevta crassa. (Pag. 98.) 
8 a, b. View of both valves of this species. 
8 ¢. View of the edge of both valves, closed ; one being more convex than the other, and slightly arched. 
8 d. A larger specimen, somewhat crushed. 8 e. A smaller specimen. 
. 9. 138. 2. OxpicuLa? FILosa. (Pag. 99.) 
9 a. A young shell, very convex or obtusely conical in form. 
9b. A larger shell, less convex than the last : this portion is magnified. 
9 ¢ & d. Two apparently full grown shells of this species; the form is much depressed, nearly flat, and the ~ 
surface completely covered by fine strie. 
~ 10; 139. 3. ORBICcULA LAMELLOSA. (Pag. 99.) 
10 a. Ventral view. 10 b. Lateral view. 
sd, 140. 4. OnpicULA TERMINALIS. (Pag. 100.) 
11 a. Dorsal valve, showing the central apex and lateral depression, which extends to the margin. 
11 8. Ventral valve with marginal apex. 11 ¢. Lateral view of a perfect specimen. 
11 d. Ventral valve, marked with strong concentric lamelle; apex marginal. 
