30 
Annals of the Transvaal Museum 
of tubercles on each side of the external surface in our specimens, and the 
relations of height and thickness of the last whorl are also different. There is 
also some resemblance with Sc. aequalis Sow. Our shell, however, has a coarser 
ornamentation, is relatively broader and has a wider umbilicus. I cannot find 
any known species with which our specimens completely agree, but then, the 
portion which often shows the most striking characters is missing. It will, 
therefore, be better to leave definite decisions in abeyance till further material 
is available. 
Scaphites sp. 
The collection contains another, very badly weathered, specimen of a 
scaphites. The involute portion is missing, as well as the end of the e volute 
portion; the remainder is only present as cast. This evolute portion is high 
and narrow, its sides are practically flat and its external surface is very narrow 
and slightly convex transversely. The sides are covered with coarse ribs, 
which may have been slightly thicker on the middle of the flanks, where they 
probably bifurcated, and where, apparently, they were slightly bent forwards. 
A row of tubercles is present on the edge of the external surface. These tubercles 
are large on the middle of the uncoiled portion, while they completely disappear 
before reaching the mouth-edge and gradually become smaller towards the 
back; they do not seem to be present on the uncoiled portion. At the anterior 
end of the specimen the ribs are seen to cross the external surface, which is 
here more rounded than before. 
Genus PELECODISCUS n.g. 
“...the sutures. These have, however, so much broader and shorter saddles than any 
specimen of that species I have ever seen, that, if there is any specific distinction in 
such peculiarities, these forms can not be included in an existing species.” Hyatt, in 
his description of Sphenodiscu's Stantoni ( 13 , p. 70). 
This genus is proposed for shells similar to Eulophoceras. It differs from 
the latter especially in the lobe-line and here the principal difference hes in 
the third lateral saddle, which is very short in Eulophoceras and practically of 
the same length as the first two lateral saddles in Pelecodiscus ; the fourth and 
further lateral saddles also reach far less forwards in Eulophoceras than in 
Pelecodiscus. In the new genus the two pairs of posterior secondary lobes of 
the external lobe are very conspicuous; a third more anterior pair is not 
present or only slightly developed. Four species are known to belong to this 
genus, three of which are being described hereafter and the fourth being 
Lenticeras Jullieni Pervinquiere from Algeria ( 19 , p. 69). The lobe-line of 
Eulophoceras natalense given by Hyatt and that of the same species given 
by Woods are reproduced on PI. VI, figs. 2, 3 for comparison. The lobe-line 
of Pelecodiscus Jullieni Pervinquiere sp. is also reproduced, PI. VI, fig. 4. 
Pelecodiscus umzambiensis n.sp PI. V, fig. 10; PI. VI, fig. i. 
Shell discoidal, with closed umbilicus. Whorls much higher than broad and 
increasing rapidly in size. The greatest thickness of the last whorl is situated 
at about one-quarter of the height of the whorl from the centre of the umbilicus, 
in the large shells; in the small specimen the greatest thickness is very close 
to the centre of the umbilicus. The lateral surface of the whorls is slightly 
convex. In the large specimens the convexity is somewhat greater near 
the umbilicus, 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 lies a groove-like concavity. The sides of the shell are slightly concave 
