182 Transactions of the Royal Society of South Africa. 
pluridens may not seem very great. The name applied to this new form is" 
in allusion to the greater number of pectinal teeth — a character of somewhat 
doubtful importance ; a difference of more value is presented in the scape of 
the pecteu, which, according to Kraepelin, is devoid of teeth along the hind 
border basally over a distance almost equal to half its length in the half- 
grown female of inter cedens, whereas in the adult female of pluridens teeth 
are absent only over the basal third of the length of the scape. Other 
differences are found in the spinulation of the tarsi. 
The characters of the adult male are as follows : Genital operculum 
considerably broader than long. Pectinal teeth 15, the scape being very 
obtusely angled at the base posteriorly. Tarsus lY with 3 spines on the 
outer lobe, and 1 or 0 on the outer side inferiorly, the superior lobe a little 
shorter than the lateral lobes. Tarsus III with 4 spines on the outer lobe, 
and 1 on the outer side inferiorly. Vesicle without granules inferiorly 
except a few near the base. Median groove of carapace very indistinctly 
forked. Interocular area for the most part cjuite smooth, but some scattered 
granules occur in the neighbourhood of the lateral eyes and of the anterior 
margin. First 3 caudal segments devoid of infero- median keels. Caudal 
segments III and lY with the terminal tooth of the superior crest enlarged 
and spiniform. All the sternites, and inferior surface of first 2 caudal 
segments, quite smooth and polished. Tergites very finely granulated 
throughout, becoming coarsely so on the sides of the last tergites. Inner 
portion of upper surface of hand moderately convex and nearly smooth, 
although throughout the area the much flattened tubercles are easily 
distinguishable on slight magnification. Finger-keel smooth and continuous 
for a considerable distance, but broken up in the basal half of the hand ; 
secondary keels of inner surface obsolete. Length of hand-back considerably 
less than the breadth of the hand. Chelicera with 4 stridulatory lamellae. 
Total length 94, length of carapace 12*1, breadth of hand 9*2, length of 
hand-back 7*9, length of movable finger 12. 
A quite young male has 14 pectinal teeth. 
The adult female is similar in general characters. The hand is very 
broad, having a prominent inner basal lobe. Upper surface lightly convex, 
with very low flattened reticulations ; secondary keels quite absent. Tarsus 
lY with 3 or 4 spines on the outer lobe, but none on the outer side 
inferiorly. Superior lobe shorter than laterals. Tarsus III with 4 spines 
on the outer lobe and 1 on the outer side inferiorly. First 6 tergites quite 
smooth except near the lateral borders. Infero-mediau keels are absent on 
the second caudal segment, and only faintly indicated on the third, which 
inferiorly has no granules, or only very few. Fourth segment granulated 
inferiorly, the median keels being composed of rather small isolated granules 
and not well defined. G-enital operculum much broader than long. Superior 
crests of caudal segments III and lY with subspiniform terminal teeth, and 
