14 
Genus, miccocephalites nov. 
Genotype, Miccocephalites miccus nov. 
Platycone [ex sphaeroeone] of Macrocephalitoid pattern, like dwarf 
“macrocephali curvicostati ” of Waagen. Cost® laminate, flexed, especi- 
ally primaries over umbilical edge, and secondaries towards edge of venter, 
carrying ribs over venter with a curve convex forwards: lamination of 
cost® well shown on a flatly arched venter. Suture-line obscurely shown, 
but it can be seen that it is simple with narrow lobes. 
Miccocephalites differs from Macrocephalites and Paracephalit.es in its 
style and curve of ribbing, which has been described above, and in its 
simpler suture-line. It differs from Metacephalites in the character of 
laminate ribbing and in suture-line. 
Distinction from Pseudocadoceras or like forms is to be found in the 
venter flatly arched instead of fastigate (angulate), in the characters of the 
ribbing, and in the decrease instead of increase of stoutness with growth. 
A species which seems comparable with these forms of Miccocephalites 
is Macrocephalites sp. Pompeckj (1, p. 73, PI. II, f, 11) from 1§ km. north- 
west of Elmwood, Franz Josef Land. In proportions it agrees nearest with 
Miccocephalites laminatus — the estimated proportions being F. 16, 41, 50, 
27 ± : it is, therefore, a thicker shell; but in ribbing it does not agree — the 
ribs are of the size of those of M. concinnus, but in direction the secondary 
ribs seem to run less forward. Pompeckj says of the ribs “across the 
outside they run straight or are almost imperceptibly bent forward.” 
Also comparable with Miccocephalites is what may be called the 
Cadoceras grewinghi series — certain species from Alaska named and figured 
by Pompeckj. These are considered later. See page 22. 
Miccocephalites laminatus nov. 
(Plate I, figures 4, 5) 
Holotype No. 8602; loc. 6593, Grassy mountain 
Proportions: S.15, —,45, — , 
S.20, 45, 42-5, 30 ± 
A somewhat serpentieonic form with rather wide umbilicus and coarse 
rather distant laminar ribs which rise strongly in transverse ridge-like 
form (transverse lamin®) over the subflattened venter. The primary ribs 
are curved: they bifurcate, but there are occasional intercalates. The 
secondary ribs are very feebly flexed. 
There is only one example and that is broken. It discloses an inner 
whorl of rather over 6 mm. diameter with distinct rounded ribs passing 
over a rounded venter with very feeble suggestions of forward arch. On 
this inner whorl may be detected suggestions of a suture-line rather 
elaborate for a young shell. 
