Annals of the Transvaal Museum 
15 
its mouth-edges have a different shape; the umbilical portion of its lobe-line 
runs backwards (that is, also the contour line over the posterior ends of the 
lobes) ; the saddles are narrow and the lobes are broad, whereas in T. nupevus 
this is the reverse. There is great resemblance between our form and Tetragonites 
Kingianus Kossmat. Nothing much can be said of the lobe-lines, since the 
two lobe-lines given by Stoliczka of Amm, Cala Forbes ( 4 , PI. LXXV, fig. 4 b 
— we do not possess Forbes’ paper) show considerable differences among each 
other. Both agree, however, in the running backwards of their umbilical 
portion, and this is not the case in our form. There is a remarkable difference 
in the direction and shape of the mouth-edges. The mouth-edges of T. Kingianus 
are straight on the flanks, those of our form are convex forwards. In T. 
Kingianus they are directed much more forwards than in T. nupevus. The 
mouth-edges of the Indian form make an angle of about 70° with a radius of 
the spiral through their starting point on the umbilical suture, while this angle 
in T. nupevus is not larger than 50°. Pervinquiere ( 18 , p. 78) referred a small 
Tetvagonites with doubt to T. Kingianus and it is not impossible, that his 
Lytocevas {Tetvagonites) aff. L. Kingianum Kossmat, of which he enumerates 
the differences with the type and which shows great resemblance with our 
form, especially with regard to the shape of the whorls and shape and direction 
of the old mouth-edges, really belongs to the present species. 
Genus HAMITES Parkinson, 
Hamites amapondensis n.sp. PI. Ill, figs. 5, 6, text-fig. 9. 
There are two fragments of a characteristic Hamites, which no doubt 
belong to the same species. Both fragments are straight. The smallest, but 
more completely preserved specimen, is taken as the type. 
Section elliptical. Shell ornamented with strong, thick ribs, which are 
separated by interspaces of not more than twice the breadth of the ribs. In 
the large specimen the ribs and interspaces have practically the same breadth. 
There are also four rows of tubercles parallel to the axis of the shell. Two of 
these are situated near the outer margin; the two others, one on each flank, 
are situated nearer to the. middle of the flank than to the inner row of tubercles. 
Every rib bears a tubercle in every row. Between the two inner rows of 
tubercles the direction of the ribs is at right angles to the axis of the shell. 
On the flanks they pass from the inner row of tubercles slightly backwards till 
past the middle of the flanks ; this portion is practically straight ; further in- 
wards they bend more backwards and this portion is therefore slightly convex 
forwards. In passing over the inner margin they are slightly concave forwards. 
In the type the tubercles of all rows are elongated longitudinally, while those 
of the inner rows are higher than those of the outer rows. In the para type this 
longitudinal elongation has made place for a slight elongation of the bases of 
the tubercles in the direction of the ribs. Further all the tubercles of this 
specimen are connected by a narrow, sharp, longitudinal groove, which is 
clearly visible in the inner row of tubercles and only faintly in the outer row. 
The lobe-line has been partially developed with acid on one side of the type. 
The saddles and lobes are all more or less of the same length ; the first lateral 
saddle is, however, somewhat longer than the others. The external lobe is 
narrow and divided at its base by a siphonal saddle of nearly half the length 
of the lobe. This siphonal saddle is broader at its base than at its top. There 
is a secondary lobe, commencing opposite the top of the siphonal saddle and 
penetrating into the external saddle; it runs till near the external end of the 
first lateral lobe, and is about as narrow as but shorter than the posterior end 
