105 



Phragmcceeas jSTestoe, var. Canadense. 



Phragmocerax Nestor, var. Canadenne, Whiteaves. . 1884. This volume, pt. 1, p. 39, 



pi. 7, tigs. 1, la-b. 



Hespeler, Elora and Durham : the three casts of the interior of the 

 shell described and illustrated in the first part of this volume. 



Phhagmoceeas paevdm, Hall and Whitfield. 



Phrar/moceraf parrmn. Hall & Whitfield. .1875. Rep. Geo. Surv. Ohio, vol. II. ,pt. 



2, p. 151, pi. 8, fig. 10. 



" " Whiteaves 1884. This volume, pt. 1, pt. 41, pi. 7, 



fig. 2. 



Durham (not Hespeler, as inadvertently stated on page 41 of the first 

 part of this volume) J. Townsend, 1881 : two imperfect casts of the 

 chamber of habitation. 



Trochoceeas Desplainense, McChesney. 



Trochocerav Desjylainensis, McChesiiey. .1S59. Descr. New. Sp. Foss Pal. rocks, 



&c., p. 68, pi. 8, fig. 1. 



Trochoceras Desplainimse, Hall 1867. Twentieth Rep. Reg. N. Y. St. Cab. 



Nat. Hist., p. 359, pi. 16, figs. 8-10. 

 Whiteaves.... 1884. This volume, pt. 1, p. 36, pi. 5, fig. 5. 



Hespeler, T. C. "Weston, 1867 : the two specimens referred to on page 

 36 of the first part of this volume. One of these shows that the position 

 of the siphuncle is central, as represented by Hall in one of his figures of 

 T. Desplainense, Elora, J. Townsend, 1885, a well preserved cast of the 

 interior of the septate portion of the shell, a little more than an inch in 

 its maximum diameter. In this specimen the sutures of the septa curve 

 concavely forward and are everywhere crossed by the rather distant 

 transverse ribs, which are directed obliquely backward, as in T. jEneas, 

 Hall, which, however, is flattened on the side=. Professor Hyatt, who 

 has seen these three specimens, thinks that they should be referred to his 

 recently constituted genus Peismoceras.* 



Discoceras Geaptonense, Meek and Worthen. (Sp.) 



Liiuites Gruftoneiisw, Meek kWorthen. .ISn. Proc. Ac. Nat. Se. Philad., vol. 



XXII.,p. 51. 

 ^" " " " ..Geol. Surv. 111., vol. VI., p. 507, pi. 25, fig. 1. 



" multicostatuji, Whit&e\d 1882. Geol. Wisoons., vol. IV., p. 303, 



pi. 20, fig. 7. 



*Phylogeny of an Acquired Characteristic, p. 500. 



