Annals of the Transvaal Museum 
5 
times the height of the first lateral saddle above the posterior end of the first 
lateral lobe, whereas in our form the first measurement is only 1-3 times the 
second. 
There seems to be a greater resemblance even with Phylloceras Velledae- 
formis Schliiter sp. (6, S. 60, Taf. XVIII, figs. 4, 5, 7). There is the same 
general appearance and a similar ornamentation. Especially the lobe-line is 
strikingly similar. The first lateral lobe has a large external branch in both 
species. The auxiliary saddles of P. V elledaeformis also seem to stand in a 
straight line. However, P. V elledaeformis does not show any old mouth-edges, 
the external portion of its ribs, which only cover a portion of the shell, leans 
forwards, while the ribs of P. Woodsi cover the whole shell and their external 
portion is radial. There is also difference in the shape of the whorls. The speci- 
men mentioned by Woods (17, p. 331, PI. XLI, fig. 4 a — c) has the same shape 
and sculpture. The beautiful lobe-line given by Woods is essentially the same 
as that of our form given in text-fig. i, the only difference being, that Woods’ 
specimen shows less auxiliary saddles. This is probably from its being taken 
on a smaller radius. I do not, therefore, doubt that this specimen belongs to 
the present species, which I have much pleasure in naming after Woods. 
Pervinquiere, however, is convinced that Woods’ figures represent a speci- 
men of P. decipiens Kossmat (18, p. 56), because shape, ornamentation and 
lobe-line are so clearly the same. P. decipiens has a much larger umbilicus 
than P. Woodsi and also than the specimen figured by Woods. The flanks of 
P. decipiens converge strongly towards the periphery, those of P. Woodsi and 
Woods’ specimen are only slightly convergent in that direction. P. decipiens 
does not show indications of old mouth-edges. The lobe-line of P. decipiens 
differs especially from that of P. Woodsi and Woods’ specimen in the very 
much shorter external lobe. 
The collection contains five specimens of this species, one of which has been 
chosen as the type. 
Genus GAUDRYCERAS de Grossouvre. 
Gaudryceras tenuilineatum n.sp. PI. II, figs. 7 — 9, text-fig. 2. 
Shell discoidal, umbilicated, consisting of numerous whorls. Whorls 
broader than high and increasing slowly in size. Greatest thickness of last 
whorl in the middle of the flanks; that of the penultimate whorl lies slightly 
more towards the external surface. External surface convex and very broad. 
The external surface seems to be less convex at the beginning of the last whorl 
than at its end. Lateral surface of whorls strongly convex and narrow. 
Umbilical surface also convex. The sides of the whorl round off evenly into 
the periphery surface and into the umbilical surface. Involution one-third, 
that is to say, one-third of the height of the penultimate whorl is embraced 
by the last whorl. Umbilicus large. 
The ornamentation of the shell is extremely fine, so fine, that it is only 
visible with a magnifying glass. To the naked eye the shell has a silky sheen. 
The ornamentation consists of numerous, very fine, crowded hair-ribs. Many 
of these ribs start at the umbilical suture, others are intercalated at a short 
distance from the suture, while some even start on the middle of the flanks. 
They all cross the external surface. The distance separating them is usually 
slightly greater than their breadth. Sometimes, how^ever, they are much closer 
together. They also pass over the thick ribs of the old mouth-edges. Between 
the diameters of 9 mm. and ii mm. there are about 130 of these ribs to a chord 
of I cm. 
