557 



Orthoc. 



taper, a fragment an inch long showing scarcely a perceptible 

 narrowing; 12^ chambers in an inch of length. Large speci- 

 mens (2'^ indiam.) show the peculiar characteristic puncta- 

 tion. Arisaig, N. Scotia. — V? 



Orthoceras rushense. (McChesney, New Pal. Foss. Coal 



Measures, 1860.) Collett's Indiana 

 Report 1883, page 164, plate 36, flg. 



|^;ci . t)\~Sh^^^^^^^^^^^^^^Si^^ ^^ natural si^e, side view of fragment. 



Attached to it are four valves of 

 Crania modesta — Lived from coal A to the top of the Coal 

 Measures in Indiana; but there are probably three or four 

 species of small Orthocerata in the Coal Measures so much 

 alike that they are mistaken for each other. Collett. It is 

 more reasonable to suppose individual peculiarities. — Recog- 

 nized by J. J. Stevenson (K3, p. 310) in the Coal Measures of 

 southwest Pennsylvania. — XI IL 



Orthoceras simulator, Hall. Doc. Edit. 28th Rep. State 



lND..Id&l. 



Museum of Natural History, plate 28, fig. 11, 12, 1878. Mus, 

 edit. p. 179, 1879. — Figures above from Collett's Indiana Re- 



