115 



Salter, 1857, op. cit. p. 327, pl. IX, fig. 2. Lud- 

 low Rocks, Underbarrow, Westtnoreland ; and Leint- 

 wardine, Shropshire. 



3. Palaslerina stellata Bill., Geol. Surv., Canada. Org. Rem. De- 



cade III, pl. IX, fig. 1, p. 76. Trenton Limestone, 

 Ottawa City. 



4. „ rugosa Bill., ibid. pl. IX, fig. 2, p. 77. Hudson Ri- 



ver Group, Anticosli. 



5. „ rigida Bill. Trenton Limestone, Ottawa City, Ca- 



nada West. 



VII. 1. Valaeocoma Marstoni Salt., 1857, op. cit. p. 328, pl. IX, fig. 3. 



Lower Ludlow, Church Hill, Leintwardine. 



2. „ Colvini Salt., op. cit. p. 328 (loc. same as foregoing sp.). 



3. „ cygnipes Salt., op. cit. p. 329 „ „ 



4. „ C Bdellacoma) vermiformis Salt., op. cit. p. 329 



(loc. ibid.) 



5. „ ( Rhopalocoma) pyrotechnica Salt. op. cit. ditto. 



6. „ spinosa Bill., Trenton Limestone, Montmorency Falls, 



Canada East. 



VIII. Palaeodiscus ferox Salt., 1857, op cit. p. 333, pl. IX, fig. 6. 



Lower Ludlow Rock, Leintwardine. 



IX. Vetraster bellulus Troost. Niagara Group, Grimsby, Canada West. 



X. I. Protaster Miltoni Salt., 1857, op. cit. pl. IX, fig. 4. Lower Lud- 



low, Leintwardine etc. 



2. „ leptosoma Salt., 1857, op. cit. pl. IX, fig. 5 (loca- 



lity ibid.). 



3. „ Sedgwickii Forb., 1849, Wem. Geol. Surv. Dec. I, 



pl. IV. Ludlow Rocks, Underbarrow, Ken dal , West- 

 moreland. 



4. „ Salteri Sowerby, 1845. Quart. Journ. Geol. Soc, 



vol. I, p. 20. Lower Silurian Cerrig-y-Druidion. 



5. „ Forbesi Hall. Upper Silurian, Herkimer Co., New- 



York. 



XT. Ptilonaster princeps Hall, 1866, 20l!i Report, p. 12, pl. IX, fig. 9. 



Chemung Group, Cordlandville. 

 XII. 1. Stenaster Salteri Bill.. Geol. Surv., Canada, Org. Rems. Dec. III, 



p. 78, pl. X, fig. 1. Trenton Liniestone, Belville, 



Canada West. 



2. „ Huxleyi Bill. Quebec Group, Lower Silurian, New- 



foundland. 



XIII. 1 „ Taeniaster spinosus Bill. Canadian Organic Re~ 



mains, Decade III, pl. X, fig. 3, p. 81. Tenton Li- 

 mestone; Falls of Montmorency. 

 2. „ cylindricus Bill., op. cit. pl. X, fig. 4, p. 81. Tren- 



ton Limestone. Ottawa City. 



XIV. Urasterella (Stenaster J pulchella Bill. sp. Geol. Surv., Ca- 



