Notes oil the Llhjdale Limestone. 89 



830 feet, and allowing for the average dip of 40°, this v.-ould 

 mean a vertical thickness of about 220 feet, but this is only 

 so far as it is at present exposed. Its eastern limit ma}' be 

 considered to be about already reached, for almost immedi- 

 ately flanking it on that side may be seen an extensive series 

 of quartzite and conglomerate strata, running conformably 



CORRIGENDA ET ADDENDA. 



Page 39. -For (See Fig. 1), read (See Fig. 9, Plate IXa). 

 For (See Fig. 2), read (See Fig. 10, Plate IXa). 

 ,, 41. — Read " Pleurorbynehus costatus " and " Pleurorhynchns 

 bellulus" under Lamellibranchiata, instead of under 

 Gasteropoda. 

 Plate VIII.— 1. Tremanotus pritchardi. 



2. Eunema etiieridgei. 



3. Stomatia antiqua. 

 IX. — 4. Tryblidium nycteis. 



5. Pleurorhynchns costatus. 



6. Pleurorhynchus bellulas. 



7. Naticopsis lilydalensis. 



8. Ambonychia tatei. 



appeals in uie quarry, wiiea juokcu ac asa^wiioje, aim iiom 

 a distance, is cream, or almost white, especially on weatiieied 

 exposures; but when freshly broken, it is of different shades 

 of dark or light bluish grey, ])inkish brown, or grey with 

 pinkish brown patches, it is for the most part semi-crystal- 

 line, is here and there somewhat l.)recciated on a snifdl scale, 

 and is in some ])laces roughly oolitic (a slide of an oolitic 

 specimen on view). 



