10 
Paracephalites glabrescens nov. 
(Plate I, figures 1-3; Plate II, figures 4-6) 
8601; 
loc. 6591, 
Grassy 
mountain 
36, 
45, 
47-5, 
14 
50, 
45, 
50, 
14 
65, 
51, 
55, 
14 
92, 
49, 
50, 
17 
101, 
46, 
47, 
16*5 
The specimen was fortunately broken in transit about across the centre, 
which allowed of these various measurements; but owing to condition of 
specimen all the measurements must be regarded as approximate ( See 
Plate II, figures 5, 6). 
Maximum size of specimen c. 125 mm. 
Suture-lme at 31 mm. breadth of whorl (Plate II, figure 4), 
EL 63, LI 55, L2 32 per cent 
Suture-line at 45 mm. breadth of whorl (Plate I, figure 1), 
EL 51, LI 47, L2 22+ per cent 
Suture-line at 64 mm. on the curve of whorl. 
EL 36, LI 33, L2 15*5+per cent 
The L2 of Plate I, figure 1, has suffered abrasion: it would be about 
2 mm. longer and so give c.27 and c.19 per cent respectively. 
Sphaerocone passing to subplatycone; costate passing to smooth; 
umbilicus gradate with convex walls, the chord at right angles to plane 
of conch. 
The specimen is entirely camerated, there being no body-chamber; 
it is broken, having lost a portion of the outer whorl ; it is also considerably 
worn, but it can be seen that the ribs give place to smoothness, though the 
wearing may have made it appear somewhat earlier than it actually does. 
There is suspicion of slightly elliptical growth (ellipticone), though this 
cannot be positively stated on account of the breakage; but there is 
certainly a slight elliptical character about the coil of the umbilicus — in 
the next whorl, part of which the specimen presumably possessed as body- 
chamber — there may have been several cameras before the body-chamber 
began — the umbilicus might be expected to expand considerably (excen- 
trumbilication), but all signs of contact line of this whorl have been worn 
away. Abrasion has somewhat affected length and elaboration of L2 
and aux. 1 (first auxiliary) on the side shown in Plate I, figure 1. 
This species differs from P. jucundus in less thickness, less ornament, 
and a smaller umbilicus; the suture-line also is somewhat less florid, even 
allowing for abrasion, as if simplification were setting in with the smooth- 
ness. The measurements of the two suture-lines of the specimen show 
proportionate reduction with growth (See above). 
This species has some likeness to Macrocephalites koeitliizi Pompeckj 
(1, p. 70, PL II, f. 12, letter-press fig. 12, p, 71) from Franz Josef Land. 
This also becomes smooth. But there are important differences in Pom- 
peckj ’s shell: it differs in proportions, which he gives as T. 60, 50, 57, 12™ 
that is to say his shell is a little thicker but has a decidedly smaller umbili- 
cus. It might, however, be thought that his shell w r as a further develop- 
ment of the present one, but it differs in ornament — the ribs pass with a 
