PLATE XXXV. 



Cyrtoceeas Quebecbnse (page 315). 



Pigure 1. Side view of the only specimen known to the writer, from the Levis lime- 

 stone at Pointe Levis. 

 M 1 a. Longitudinal section of a small piece of the narrower end of the same, 

 shewing part of the large, cylindrical, dorsal and marginal siphuncle, 

 and the out edges of some of the rather closely approximated septa. 



GOMPHOCEEAS PARVULUM (page 296). 



Figure 2. Diagrammatic outline of an entire specimen, the details taken from several 

 specimens, some of which are natural moulds of the exterior, or casts 

 of the interior of the body chamber, and others casts of the interior of 

 the septate portion of the shell ; all from the Silurian limestone at the 

 Grand Rapids of the Saskatchewan. 



II 2 a. Outline of the anterior end of a wax impression of a natural mould of the 

 exterior of the body chamber of a specimen of this species from Grand 

 Rapids, shewing the Y — shaped aperture. 



M 2 h. Outline of one of the septa of a specimen of this species, from the same 

 locality, — near the body chamber, to shew the relative position of the 

 siphuncle. 

 The three figures of this species are from original drawings by Mr. L. M. 

 Lambe. 



Plectoceeas Halli (page 302). 



Figure 3. Side view of an unusually perfect, well preserved and apparently adult 

 specimen of this species, from the Black River (?) limestone at the 

 Falls of the St. Charles River at Indian Lorette, collected by Mr. 

 Weston in 1898. 



M 4. Ventral side of part of the nearly or quite free anterior end of another and 

 rather larger specimen of this species, collected by Mr. Weston at 

 Loiette in 1898, shewing the comparatively deep ventral sinus of the 

 outer lip. 



I. 4 a. Dorsal view of the same specimen, shewing the nearly straight dorsal 

 margin of the inner lip, and a faint dorsal furrow. 



