1918] The Ottawa Naturalist. 123 



to the diameter of the shell, was found loose, about a mile north of the 

 light house at the southern end of the peninsula. Its horizon appears 

 to have been the cherty Richmond. It differs from the Trenton 

 species named in having the septa relatively even more distant, the 

 ratio mentioned above varying from 5 to 8 in 10. The siphuncle 

 apparently was narrow and cylindrical, probably not exceeding a 

 millimeter and a half in diameter where the width of the shell is 15 

 millimeters. 



A species of Amphilichas and one of Chasmops occur in the 

 cherty Richmond. The fragment of the first (Figs. 27, A, B), as far 

 as preserved, cannot be distinguished from the type of Amphilichas 

 cucidlus (Meek and Worthen), described from the Kimmswick lime- 

 stone, in Alexander county, Illinois, (Geo. Surv. Illinois, vol. Ill, 

 1868, pi. 1, figs. 6 a, b, c). This type is numbered 12021 in the 

 Worthen collection in the University of Illinois, and was examined 

 through the courtesy of Prof. T. E. Savage. The axial and lateral 

 lobes of the glabella, the occipital segment, and as much of the fixed 

 cheeks as remains, present the same appearance in the Richmond 

 specimen and in the Kimmswick type from all points of view. Al- 

 though at first sight the Richmond specimen appears to be much more 

 abundantly tuberculated, a close examination of the Kimmswick type 

 indicates the presence of similar tubercles or granules, but those of the 

 Richmond specimen are much more prominent, at least in their present 

 state of preservation. Two figures of the Kimmswick type (Figs. 

 26 A, B) are here presented. The first presents the left side of the type 

 of the cephalon,. and the second illustrates the anterior, so placed as to 

 have the top of the axial lobe parallel with the line of vision . 



The associated specimen of Chasmops, mentioned above, consists 

 of a fragment presenting the middle and lateral lobes of the glabella 

 and the occipital segment. This is sufficient to indicate the generic 

 reference. In the illustration here presented (Fig. 32), a faint outline 

 of the probable course of the movable cheeks and genal spines is pre- 

 sented, but this part is not preserved in the specimen at hand. For 

 purposes of comparison, several illustrations of Chasmops breviceps 

 (Hall) Figs. 31 A, B, C, from the upper part of the Richmond, at 

 Richmond, Indiana, are here presented. The original specimens were 

 collected hereby Mr. John Misener. The only specimens collected by 

 myself were obtained near the top of the Liberty member of the 

 Richmond, along Cowen creek, in Clinton county, Ohio. Here they 

 were associated with Xenocrinus baeri (Meek), Gyroceras baeri (Meek 

 and Worthen), Gomphoceras eos Hall and Whitfield, Ceraurus 

 miseneri Foerste, typical pygidia of Amphilichas harrisi (Miller), 

 accompanied by a fragment of a glabella (Figs. 28 A, B) bearing the 

 same kind of pustulose ornamentation as the aforesaid pygidia. In this 

 fragment, the strong downward curvature of the anterior part of the 



