SUPPLEMENT, PLATE VL 



Spirals and loops developed by the Rev. N. Glass. 

 Fig. 

 1 — 9. Whiffieldia tmnida, Dalman, sp. 1 and 2. The dorsal valves removed to show 



the spirals. 3, 3 a, 3, c. The spirals entirely removed 

 from the interior of the shell, so as to show them in 

 different aspects. 4, 4 a, 4(5. A specimen seen in 

 different aspects, and worked by Mr. Glass, so as to 

 show the primary lamellae, their attachments to the 

 hinge-plate, and the forked loop. 5 to 9. Other 

 similar preparations to show that the characters are 

 constant and the same. All these specimens worked 

 by Mr. Glass were procured by him from a railway 

 cutting near Walsall, and are from Wenlock shales. 

 (P. 107.) 



10. Meristina didyma, Dal., sp. Worked by Mr. Glass, and now in the collection 



of Mr. Hollier. (P. 94.) 



11, 12. Spirifera plicatella, var. radlata. Sow. Specimens developed by Mr. Glass to 



show spirals. 12 and 12 «. Spirals entirely removed 

 from interior of shell. Wenlock limestone, Walsall. 

 (P. 87.) 



13, 13 a. Cyrtia exporrecta, Wahl. To show the spirals. Wenlock limestone, Walsall. 



14 — 15. Atrypa reticularis, Linne. Specimens developed by Mr. Glass to show the 



spirals in different aspects. Wenlock limestone, Wal- 

 sall. (P. 109.) 



