PLATE XLIX. 
Fig. 1: GAMER OCERAS; 1S Dyess clase oto ce wach totes TA TOR Oo De Mee Eee 177 
A long cylindrical sipho, with very broad septal funnels; representing a distinct 
but otherwise unknown species. 
From the Trenton limestone, Cannon Falls, Minn. 
This specimen may be advantageously compared with the figures of Orthoceras 
simpsoni Billings, given by Whiteaves. (Orthoceratide of the Trenton lime- 
stone of the Winnipeg basin; Trans. Roy. Soc. Canada, vol. ix, sect. iv, p. 80, 
pl. vii, figs. 2, 2a, 3; pl. viii, fig. 1, 1891). 
Fig. 2 SCAMEROCHER AS PRODEIE ORME Elalllaes sachet na eisetenemierstldsleee cree a ceeeeenieeen ee TIT 
(See also plates LVi1I, XL, XLI, XLII.) 
A portion of a large individual, showing the extent of the solid apical end of the 
sipho, and the abrupt increase in the depth of the air-chambers above the distal 
extremity of the body. Where the apical sheath is broken, at the lower 
extremity of the specimen the cast of the internal cavity and the thickness of 
the sipho are exposed. Cannon Falls, Minn. 
