64 
complex, thereby increasing the number of secondary ribs. After 35 mm. 
diameter the costae on the umbilical half of the flank become obsolete, 
after which the remaining ornamented area narrows so that at 100 mm. 
only the centre and one-sixth of the flank are costate. 
Table showing number of ribs in a quadrant of whorl at various stages. 
Diameter 
20 mm. 9 primaries 21 secondaries 
35 “ 8 “ 33 “ 
90 “ primaries obsolete 25 " 
Dimensions. Holotype has a maximum diameter of about 105 mm. 
Thickness at this diameter is 18 mm. Width of umbilicus, 18 mm. 
Name. In allusion to the various plans of branching of the costae. 
Locality. Zone of Homolsomites poecilochotomus, on the southeast 
shore of the peninsula. 
Family, phylloceratidae 
Genus, Phylloceras Suess 1865 
Phylloceras columbianum sp. nov. 
Plate XXII, figures 1, 2, 3 
Shell, quite smooth. Septal line with about seven lobes, exclusive 
of the external lobe. Mouth-border unknown. 
Dimensions. Holotype — maximum diameter, 65 mm.; major radius, 
40-5; minor radius, 24*5; thickness, 21-5; thickness at minor radius, 16; 
umbilicus, 4 • 5 per cent of diameter. 
Locality. On the southwest shore of a small point on the southwest 
side of the small bay on the southwest shore of the peninsula, where it is 
associated with Anacardioceras perrini. 
Name. Geographical from British Columbia. 
Phylloceras'^ aff. knoxvillense Stanton 
Stanton: Bull. 133, U.S. Geol. Surv. 
Fragments of a very large form highly similar in ornament and septal 
line to Stanton’s species. It may differ in proportions. Not suflficiently 
complete for naming or special description. 
Locality. Zone of Aucella canadiana, 350 yards from shore and 1,400 
yards north of the mouth of Deer creek. 
^^Phylloceras" sp. indet. 
Fragments of a smooth, latumbilicate ‘‘Phylloceras", having a complex 
septal line. Quite distinct from Phylloceras s.s., but not sufficiently 
complete for further description. 
