ARCTIC ORDOVICIAN AND SILURIAN CEPHALOPODS 303 ' 
other Arctic Silurian fossils, one which he called ‘‘Lituites — , n. sp.;’^ 
but this is stated to have six or seven whorls at least, and therfore it 
could have no affinity with the present species. There was, therefore, 
no other course but to give this form a new name. 
Horizon. Silurian. 
Locality. Wellington Channel, Arctic America. 
“Represented in the Collection by one example, collected by Captain 
Inglefield.’’ 
The specimen described above is numbered 96955 in the British 
Museum. Dr. F. A. Bather has kindly presented me with an 
excellent cast of the type, also a photograph, and a cross-section. 
Both the cast and the photograph suggest that the color of the 
matrix is black. The cross-section is accompanied by the 
following annotations, evidently applicable to that whorl which 
exposes the siphuncle: Siphuncle circular, diameter 2.2 mm.; 
distance from venter, 2.8 mm.; dorso-ventral diameter of whorl, 
15.7 mm.; lateral diameter 13.8 mm. 
EuRYSTOMITES (?) BOREALE (FoORd). CrOSS-SeCTION OF TyPE, SHOWING LOCA- 
TION OP Siphuncle. Drawn by Dr. F. A. Bather 
From this cross-section it is evident that the conch is a nautil- 
cone with a distinctly impressed dorsal side. Since no reference 
