191 



In addition to the guards already described, three large and de- 

 tached phragmocones of Belemnitee, or portions of phragmocones, were 

 collected by Dr. G. M. Dawson, on the south side of Alliford Bay, and 

 one on the north shore of Cumshewa Inlet. The most perfect of these 

 is about thi-ee inches in length by one inch and three quarters in 

 diameter at the larger end, and one inch at the smaller. These speci- 

 mens may have formed part of very large individuals of B. densus, but 

 they do not possess any characters by which they can be identified. 



Nautilus Suciensis, AYliiteaves. 



Plate 21. 



Nautilus, Sp. Undt. 



Nautilus Suciensis, Whiteaves. — This vohmie, page 14. lb., page 97, plate 11, 



figs. 1 and la. 



Six large ribbed Nautili which are specifically identical with the 

 fine sjDccimen of a Nautilus obtained I;*}' Mr. Eicliai-dson in 1872 and 

 described on pages 14 and 15 of the present volume, were collected by 

 Dv. G-. ]M. Dawson at two localities in Skidegate Inlet. On examina- 

 tion and comparison, these specimens appear to represent only a rather 

 finel}^ ribbed and stratigraphical as well as local variety of the iV. 

 Suciensis from the Sucia Islands, a species which was based on one 

 nearly entire but comparatively small specimen with the nacreous 

 layer of the test only preserved, and a fragment of the cast of a much 

 larger individual. The following is an amended description of the 

 Queen Charlotte Island variety of the species : — 



Shell large (the maximum diameter of the largest specimen being 

 fully seven inches) inflated, subglobose but always depressed in the 

 centre of the umbilical region, periphery broadly rounded, sometimes 

 flattened or even slightly concave in the middle. Inner whorls com- 

 pletely covered by the last volution, umbilicus closed or nearly so 

 when the test is preserved, its place being occupied by a narrow but 

 somewhat deep depression or pit, — small and funnel-shaped in the 

 cast. Aperture subcircular, (or in some specimens almost subquadrate) 

 and rather deeply emarginated by the encroachment of the preceding 

 volution. Surface of the outer whorl marked by numerous (about sixty) 

 flattened, radiating ribs, Avhich curve boldly forwards over the outer 

 half of the sides and backwai-ds on the periphery, upon which latter 

 each rib forms a moderately deep but scarcely angular sinus. Test 

 thick. 



