RECORDS OF IV. A. MUSEUM. 
[233 
more small rounded tubercles on their inner margins which are 
scarcely developed in the smaller examples. Wrist with a sharp 
internal spine, and often several smaller ones neat its base. 
Such specimens as retain any traces of colour appear to have 
been purplish with minute pale dots on the chelae. 
The material described above was collected at the following 
localities in South-western Australia; — Chidlow s Well, north-east 
of Perth ; near Perth ; Cannington, south of Perth ; seven miles 
above Harvey, Harvey River ; Korijekup, Harvey River. According 
to Mr. Alexander, this species, which is known as the gilgie, is 
probably restricted to the smaller streams which do not dry up in 
the summer. In addition to the above noted localities, he has 
identified specimens from the Vasse River. 
CHERAPS TENUIM ANUS, Smith. 
Plates XXXIV & XXXV. 
Chaenips lenuimanus, Smith, Proc. Zool. Soc., 1912, pt. I., p. 166, pi. XXII., and 
pi. XXVII., fig. 30. 
A well graduated series of forty specimens, ranging from 
57-296 mm. long from the tip of the rostrum to the end of the telson, 
shows considerable variation in the form of the chelae and rostrum, 
as well as in the armature of the latter. 
The chelae are always much more slender in young specimens 
than in adults, while large specimens always have the fingers bent 
more or less obliquely inwards. The teeth on the inner margin of 
the palm are scarcely developed in small specimens, bur become 
very prominent in adults ; there are usually seven or eight, but may 
be as few as three. Though these alterations are correlated with 
growth, yet specimens of the same size are not always equally 
changed, some retaining their juvenile characters longer than others. 
Some different forms of chelae are illustrated on plate XXXV. 
The rostrum has from three to six denticulations on either side 
which, as often as not, are not paired but more or less alternate. 
Its length and breadth are also variable; it may reach well beyond 
the antennular peduncle, or only to the middle of the last joint, but 
it never attains the tip of the antennal scale. A few of the most 
striking variations shown in my series are figured on plate XXXV. 
