RECORDS OF W.A. MUSEUM. 
[231 
It ends in a spine and there are two, inconspicuous, lateral serra- 
tions on each side near the tip. Abdomen with pits, but otherwise 
smooth. 
Chelipeds massive, the hand either half, or usually more than 
half as broad as long. It is smooth and rounded above with 
minute, rather scattered pits which become larger and more 
crowded on the outer surface. Inner margin raised, with seven to 
nine serrations which form rounded tubercles in large specimens ; 
a tomentose patch inside this margin. Fingers either meeting 
along their whole length or more or less widely gaping. Mobile 
finger with a rounded tubercle about the middle of its length, which 
may be either extremely small, or large and followed by several 
smaller ones. Immobile fingers with a row of larger or smaller 
tubercles along the basal half. Wrist with a large blunt internal 
spine and sometimes a second smaller one at its base. 
The colours are faded, but the chelae appear to have been 
purplish with many lighter spots. 
Of the eighteen specimens, eleven are from Kojonup ; six were 
collected in a billabong at Harvey, Harvey River; and one from 
Guildford, near Perth. Mr. Alexander has also seen it from 
streams outside the Mammoth Cave and inside the Calgardup Cave, 
in the cave district. South-western Australia. The specimens from 
the latter were living absolutely in the dark. 
CHERAPS PREISSII. var. ANGUSTUS, var. nov. 
Plate XXXII. 
This variety differs from the typical form only in having more 
slender chelipeds and legs, and a slightly narrower carapace. The 
chelae are particularly narrow in my smallest specimen, and in this 
respect differ greatly from others of the typical form of about the 
same size in which they are almost similar to, those of the adults. 
The colour, after long preservation, is a dark violet with light bluish 
areas on the sides and under parts. 
The plate illustrates the only three specimens I have seen 
which were collected for the Australian Museum by Mr. A. Abjorns- 
sen, near Albany. They are 141, 102, and 78 mm. long from the 
tip of the rostrum to the end of the telson, and the largest and 
smallest are females. 
