264 PROC. COTTESWOLD CLUB vol. xiii. (4) 



*Microthyris tardecrescens 



*PSEUDOGLOSSOTHYRIS SIMPLEX 



*Rhynclionella standisliensis 



Terebratula fimbria 

 *Terebratula hyalina 

 *Terebratula imitator 

 *Terebratula microtrypa 



Terebratula perraaxillata 

 *Terebratiila polyplecta 

 *Terebratula siderica 

 *TerebratTila subomalogaster 

 *Terebratula withingtonensis 



Terebratula wOrttembergica 

 *Zeilleria anisoclines 



Zeilleria bicomis 

 *Zeilleria circularis 

 *Zeilleria emarginata 

 *Zeilleria ferruginea 

 *Zeilleria subcomuta 



IX. Appendix I. — On Photographic Reproduction 



Plate XIII. of this paper forms an interesting experi- 

 ment in photographic reproduction, and a few words may- 

 be said about it. 



Photography is the ideal method to employ for depicting 

 fossils, because thereby the small personal errors of the 

 artist are avoided — errors inseparable even from the best 

 work. But few people realize how difficult is the photo- 

 graphy of fossils, on account mainly of the diiferent actinic 

 values of their tests (or casts). 



The plate in this paper is not put forward as an altogether 

 successful result of photographic reproduction ; but it was 

 considered fair as a first experiment. 



For successful fossil photography the following condi- 

 tions are requisite : — Careful lighting by a side light, the 

 specimens being horizontal, and the camera being mounted 



