Figure 40 Ordovician fossils. (Cystoids, A, B; crinoid, C; pelecypods, 

 D-H; gastropods, I-L; cephalopods, M-Q). A Edrioaster saratagensis , x2J4. 

 B 1, 2 Malocystites emmonsi, x2. C Ectenocrinus canadensis, x}6. -D 

 Modiodesma modiolatre, x*/i. E Pterinea demissa, x J / 2 . F Byssonychta 

 radiata, x^2. G Cuneamya scapho. H Ctenodonta pectunculoides. II, 2 

 Tetranota bidorsata. J Hormotoma trentonensis , x%. K Lophospira bicvncta. 

 L Cyrtolites ornatus, x&. M Orthoceras rtwlticameratum, x*4. N Onco- 

 ceras pristinum, x%. O Cyrtoceras filosum, x^. P Trochohtes ammomus, 

 x J /i. Q 1, 2 Maclurea magna, x%. 



