UAVIDSON — SCOTl'lSH CAlMiONlKKUOUS liKACHlOrODA. 
2(57 
15. Orthis reswpinata. Variety (?) from Corrio Burn ; collection of Mr. 
Young. 
16. StrcptorhyncMts crenistria, Phillips. From Corrie Burn. 
17. . Outline of a largo specimens from West 
Broadstone. Many examples of Phillips' var. senilis have been re- 
cently found in the limestone of Boertrapping, three miles soutli of 
Glasgow, by Mr. J. Thomson. 
18. ■ . Interior of the ventral valve. 
19. . Interioi- of tlio dorsal valve. 
20. . A young s])ecimen from Gare. 
21. . Longitudinal section to show the space left 
for the animal between the valves. 
22. . A small specimen from Gare. 
23. , var. Kellii, M'Coy. From AjTshu-e. 
21. , yai: radialis, Phillips. From Middleholm; 
collection of Dr, Slimon. 
25. . From Grare. 
26. Stroplwmena rliomhoidalis, var. omaloga, Phillips. Corrie Bm'n ; collec- 
tion of Mr. Young. 
27. -. Interior of ventral valve. 
28. . Interior of ventral valve. A, occlusor ; 
R, divaricator ; P, pedicle (?) ; P, interior opening of foramen, which 
is closed at X in fig. 27. 
29. . Interior of the dorsal valve. V, vascular 
impressions. 
30. . A very young example, in which both 
valves ai'e straight. 
31. . A fi-agment of the ventral valve, showing 
the external orifice of the foramen. 
32 — 33. , vai\ distorta, J. de C. Sowerby. From 
Gare. 
Plate II. 
. 1. Clionetes BucMana, de Koninck. From Grare ; la b, enlarged represen- 
tations. 
2. Hardrensis, Phillips. Nat. size. From East Bams, near 
Dunbar. 
3. . Interior of ventral valve. A, occlusor ; R, diva- 
ricator ; collection of Mr. Annsti-ong. 
4. . Interior of dorsal valve. A A, quadruple im- 
pressions of the occlusor ; X, reniform impressions. Capel Rig, East 
Kilbride. 
5. . A young shell, from Craigie, near Kilmarnock ; 
collection of Mr. Thomson. 
6. . A young shell from MiU Burn ; collection of Mr. 
Young. 
7. . A small variety (?) from South HiU, Campsie ; 
collection of Mr. Young. 
8. Productus latissimus, Sowerby. From near Dairy. 
9. . Interior of the dorsal valve, from Belston Burn. 
(A fig. of the ventral valve will be found, pi. iv., fig. 26). 
10. longispinus, Sow. With its spines restored ; from Lanarkshire. 
11. . From Craigie, near Kilmarnock ; collection of 
Mr. J. Thomson. 
12. . From the original specimen of P. longispinuSf 
Sow. West Lothian and collection of Dr. Fleming. 
13. , var. lobatus, Sow. From Lanarksliire. 
