i6 Annals of the Transvaal Museum 
of the external lobe. The first lateral lobe is beautifully bifid and very broad. 
It is j ust as long or perhaps slightly longer than the external lobe and appreciably 
longer than the external portion of the second lateral lobe. The difference in 
length between the first lateral lobe and the external portion of the second 
Text-fig. 9. Hamites amapondensis. Lobe-lines of type from dorsal to ventral [line. 
X 3-8. The anterior portions of the saddles of a previous lobe-line have been 
added to the following one, where these portions are missing (dash-line). Un- 
known portions have been indicated by a dotted line. The “unknown" portion 
of the second lateral lobe has been drawn from a posterior view of a septum. 
lateral lobe is about the distance between two ribs. The second lateral lobe is 
also bifid. The external saddle, which is unsymmetrically bifid, is much nar- 
rower than the beautifully bifid first lateral saddle, and practically just as 
broad as the antisiphonal saddle. 
Measurements : 
Type Paratype 
Long diameter of section 20 mm. About 40 mm. Actual transverse 
breadth of piece 35 mm. 
Short diameter of section 16-3 mm. 
This species shows great resemblance with Hamites quadrinodosus Jimbo 
( 11 , p. 39, PI. VII, figs. 3, 4). In fact, the resemblance is so great, that I at 
first felt inclined to regard our specimens as identical with the Japanese 
species. It appeared, however, that our specimens are slightly more oval, that 
the ribs might be somewhat closer together and that there might be a difference 
in the shape of the tubercles and the course of the ribs. Jimbo's description is 
not clear on these points. However, he gives a complete figure of one side of 
the lobe-line. It was therefore decided to develop at least a portion of the 
lobe-line of our specimen. It will be seen if the above description be compared 
with Jimbo’s figure, that the two species have a lobe-line built after the same 
plan, but differing greatly in detail. The posterior end of the external lobe for 
example has an enormous lateral development in H. quadrinodosus, which 
difiers greatly from that in H. amapondensis. The siphonal saddle has conse- 
