15 
Miecocephalites miccus nov. 
(Plate I, figures 6, 7) 
Genotype and Holotype No. 8603; loc. 6591 
Proportions: S. 16, 44, 40, 20 ± 
Like M. laminatus, but the ribs are smaller and closer together, the 
umbilicus is smaller, and the thickness is less. 
This species has been chosen as the genotype because it gives indica- 
tions of suture-line: they are, however, not satisfactory. 
Miecocephalites concinnus nov. 
(Plate III, figures 5-11) 
Holotype No. 6099; loc. 6591 
Paratypes: No. 8604, loc. 6593; No. 8605, loc. 6593; all from Femie 
formation, Grassy mountain 
Proportions: Holotype, S.12, 43, 44, — ; 
19-5,46,40, 16-5 
Paratype, S. 16, 44, 40, 17, ± ; size of specimen, 
17 mm., max.c. 17 mm. 
Paratype, S.13, 46, 39, 17, ± 
A neat little species with closely approximate subcostse or costulse 
looking like a very dwarf edition of the genotype species of Macrocephalites, 
but distinguished by the ventral characters of ribbing which have been 
described above. There are in the holotype about 25 primary ribs which 
have a distinct curve over upper edge of inner margin. They bifurcate at 
about one-third from inner edge and there are intercalate ribs. These 
secondary ribs do not continue the line of curve of the primaries but fall 
back a little to curve forward later. The whole course of these sub- 
flexiradii is prosiradiate. The angustumbilicus is gradate, the wall which 
seems to carry ribs is about rectangular to the plane of the conch. 
Both the paratypes are broken. Plate III, figure 9, shows inner 
whorls (0*5 mm. diam.) of the Cymbites stage — with only very faint 
indications of ribs. 
This specie's is distinct from M. miccus by the fineness of the ornament. 
This species has a noticeable likeness to Stephanoceras subcompressum 
Waagen (PI. XXXIV, f. 4) macrocephalus zone. If that shell were reduced 
to about one-sixth of its size or this one were to be multiplied six times 
the resemblance would be certainly close, except that the larger shell would 
show too many ribs. But the proportions are quite similar; the ribbing 
has similar curvature and direction; there is, however, a difference — the 
Kutch shell has a tripartite arrangement of ribs — dichotomy of primary 
and later dichotomy of one secondary, almost a virgatome arrangement. 
