Annals of the Transvaal Museum 
37 
Diameter 
00 
mm. (i-oo) 
i 6*3 mm. 
(I-OO) 
Height of last whorl ... 
14 
.. (0-52) 
8-9 „ 
(0-55) 
Thickness of last whorl 
6-7 
.. (0*25) 
4-6 „ 
(0-28) 
Height of penultimate whorl . . . 
5-7 
„ (0-21) 
3 
(o-i8) 
Thickness of penultimate whorl 
3-7 
(0-14) 
2-7 „ 
(0-17) 
Diameter of umbilicus... 
3-7 
M (0-14) 
2-2 „ 
(0-14) 
The largest specimen is regarded as the type, the other specimens as para- 
types. 
Schloenhachia Umhulazi Baily sp. Forma typica. PL VIII, figs. 6 — 9; PL IX, 
figs. I, 2. 
The typical form differs from the just described variety in the ornamenta- 
tion, The ribs are stronger; they start broad and low from the umbilical 
tubercles. Old mouth-edge grooves are deep and broad in larger shells, and 
cut up the inner portion of the flanks into thick and broad convexities. On 
the outer portion of the flanks the number of ribs is augmented by intercalation 
of shorter ones. On the shoulder near the keel these ribs form low tubercles, 
elongated in the direction of the rib. There are three or four shoulder tubercles 
to every tubercle on the umbilical edge. The largest specimen shows a portion 
of the last mouth-edge. It is curved in the same way as the growth-lines and 
the keel runs out into a sharp point. The living chamber occupies five-twelfths 
of the last whorl. I did not find any difference in the lobe-line. 
Measurements : 
Neoparatype Neotype Neoparatype 
Diameter ... 
58*4 
mm. (i-oo) 
45-9 mm. 
(I-oo) 
33-1 
mm. (i-oo) 
Height of last whorl 
29-2 
M (0*50) 
23*6 „ 
(0-51) 
17-5 
M (0-53) 
Thickness of last whorl . . . 
15 
,, (0-26) 
13-8 
(0-30) 
8-3 
(0-25) 
Height of penult, whorl ... 
13-5 
.. (0-23) 
10-8 ,, 
(0-24) 
6-8 
(0-21) 
Thickness of penult, whorl 
8 
(0-14) 
6-4 „ 
(0-14) 
4*3 
(0*13) 
Diameter of umbilicus ... 
9 
(0-I5) 
6-7 „ 
(0-15) 
5 
„ (0-15) 
Thirteen specimens of this form have been picked out of the total number 
of this species mentioned above. Woods states that the type of Schloenhachia 
Umhulazi Baily sp. cannot be found ( 17 , p. 337). I will therefore pick as 
neotype the second specimen measured, while the other specimens niay be 
regarded as paratypes to this neotype, and may therefore be called neopara- 
types. 
Schloenhachia Umhulazi Baily sp. var. spinifera n. var. PL IX, figs. 3 — 7. 
In some cases this variety closely resembles the typical form, but it differs 
from the type in the following respects: its umbilical tubercles are large and 
high, even in small forms. Its ribs are strong and especially in small forms 
curved somewhat less than those of the type; the shoulder tubercles are also 
fairly prominent. The flanks of the smaller forms are fairly flat, those of the 
end of the last whorl of the largest specimen are slightly convex. The greatest 
thickness of the whorl lies at the umbilical edge. The relative height of the 
last whorl seems to be generally slightly less than that of the other types. 
The relative thickness of the whorls and the relative diameter of the umbilicus 
is greater than in the other types. The lobe-line of the large specimen has been 
developed, but its preservation is bad. The lobe-line of a smaller specimen 
shows no striking differences with that of the other types. 
