32 
Annals of the Transvaal Museum 
The three first lateral saddles are broad. The two first have a generally 
rounded anterior contour, while the third is rather broad and flattened 
anteriorly. The two first saddles are cut up by numerous secondary lobes ; the 
third is bifid and both its arms are also bifid. The second reaches slightly 
further forwards than the first. The third reaches just as far forwards as the 
first. The fourth lateral saddle is broader and shorter than the third; it is 
deeply bifid and both its arms are also bifid . The fifth lateral saddle is narrower 
than the fourth; it is also bifid and its arms show a tendency to bifidity. In 
the larger paratype the fourth lateral saddle is much narrower than the third. 
A line touching the anterior tips of all the saddles, is slightly convex forwards 
throughout. Its inner third runs gradually more and more backwards. 
Measurements : 
Comparison with Eulophoceras must chiefly be based on the lobe-lines, for 
the state of preservation of Hyatt’s type does not allow of much else. The 
lobe-line of E. natalense as figured by Hyatt ( 14 , PI. XI, fig. 2, and reproduced 
PI. VI, fig. 2) differs considerably from that of the present specimen. The 
second lateral lobe does not reach so far backwards. The second lateral saddle 
reaches much further forwards and the fourth and further lateral saddles are 
differently arranged. The third lateral saddle is much shorter than the first. 
The consecutive sutures are also closer together than in any of our forms of 
Pelecodiscus. For better demonstration of these differences a reproduction is 
given of the sutures of E. natalense as drawn by Hyatt. There is no other 
described South African form, which is closely related to the present species. 
Its nearest relation, except two other new South African forms, is Lenticevas 
Jullieni Pervinquiere, from Algeria ( 19 , p. 69). It is quite clear that the 
present form and the North African one belong to the same genus; in fact, the 
resemblance is so great, that they can only be separated by detail. The principal 
difference lies in the fact, that Pelecodiscus Jullieni has fairly strong undulations 
near the umbihcus and is at least much smoother near the periphery, while in 
P. umzamhiensis the area around the umbilicus is smooth, the undulations 
being strongest near the keel. The lobe-line of P. Jullieni as drawn by Per- 
vinquiere is reproduced in fig. 4 of PI. VI. The sutures of the new species are 
present with but little variation in two more specimens of which the smallest 
has a diameter of about 60 mm. 
Three specimens have been referred to this species. 
Pelecodiscus capensis n.sp. PI. V. fig. ii. 
Shell discoidal, with closed umbilicus. Whorls much higher than broad and 
increasing rapidly in size. Greatest thickness of last whorl very close to the 
centre of the umbilicus. The lateral surface of the shell is shghtly convex, the 
convexity being somewhat greater where the shell is thickest. The umbilicus 
is filled with shell-growth, which is raised in the centre to a kind of process. 
Around this process hes a groove-like concavity. The sides of the shell are 
slightly concave on both sides of the keel. The keel is sharp. 
Little can be said of the ornamentation, for the greater part of the shell 
has disappeared. However, there are stiff indications of spiral-lines and growth- 
lines ffke those of P. umzamhiensis. Undulations hke those of P. umzamhiensis 
are also present, together with undulations around the umbilicus, which are, 
however, not so pronounced as in P. amapondensis, described hereafter. 
Diameter 
Height of last whorl . . . 
Thickness of last whorl 
about 125 mm. (i-oo) 
77 (0-62) 
26 ,, (o-2l) 
