Annals of the Transvaal Museum 
3 
the ornamentation. However, as far as can be made out, it agrees well with 
the above description. As in the type, a large portion of the body-chamber is 
present. However, the sipho is seen in the damaged preceding portion; it lies 
apparently a little above the centre. The sutures of this specimen are straight. 
They are straight on the flanks and they do not deviate from their course over 
the periphery. They are perhaps very slightly convex forwards near the 
umbilicus. The extreme end of the last whorl is not rounded as its preceding 
portion, but nearly flat. 
Measurements : 
Type Paratype 
Diameter ... ... 6o mm. i68 mm. 
Height of last whorl ... 35 about loo ,, 
Thickness of last whorl 41-42 ,, 
41 is the actual thickness of the last whorl and 42 the probable. 
I do not see any difference between this species and the specimen described 
by Woods from the same locality but not named (17, p. 330 , fig. i). The only 
difference of importance seems to be the presence of a funnel-shaped umbilical 
depression. The present species differs from Nautilus elegans d'Orbigny in its 
different ornamentation and by the more central position of its siphuncle. 
Our cretaceous literature is far from complete and the necessary comparison 
with described forms can only be made to a limited extent. There is not one 
specimen, described in the literature listed hereafter, with which our species 
can be confounded. 
I have much pleasure in naming this species after Woods, who was the 
first to describe and figure it, but whose material was not sufficiently well 
preserved to allow him of giving it a name. 
AMMONOIDEA. 
Genus PHYLLOCERAS Suess. 
Phylloceras Woodsi n.sp. PI. II, figs, i — 6, text-fig. i. 
1906. Phylloceras sp. Woods. 17, p. 331, PI. XLI, fig. 4. 
Shell discoidal, umbilicated. Whorls strongly involute, high and narrow. 
Greatest thickness midway between the umbilical edge and the middle of the 
flanks. External surface strongly convex. Flanks very slightly convex and 
only slightly convergent towards the periphery. There is no line of demarcation 
between flanks and external surface. The portion of the flanks internal to the 
greatest of the whorl, slopes very gradually towards the umbilical surface, 
which is very low and strongly convex and the inner portion of which slopes 
outwards ; consequently the radius of the umbilical suture is longer than that 
of the innermost portion of the umbilical surface. The involution is such, that 
only an extremely narrow strip of the preceding whorl remains uncovered. 
The ornamentation consists of numerous, crowded, thin, wire-like ribs. 
On the outer third of the whorl these ribs are distinctly coarser than on the 
inner two-thirds. The coarse portion of the ribs is straight and they pass with- 
out deviation over the external surface. In their coarse portion the ribs are 
high, narrow and rounded and have steep sides. On the middle of the flanks 
the ribs are slightly convex forwards ; internal to the middle of the flanks they 
run backwards, in the direction of the umbilical edge; on the inner third of 
the flanks they are concave forwards and they pass over the umbilical edge 
in a slightly forward direction. The inner two-thirds of the ribs are very low, 
narrow and rounded, and their sides have a moderate inclination. 
I — 2 
