23 °] 
RECORDS OF W.A. MUSEUM 
Martens was unable to find it in the Berlin Museum in 1868, and 
Professor A. Brauer, Director of that Institution, has very kindly 
informed me that it is not there now, and that he does not know 
where it is. 
For the purpose of this paper, I have examined over one 
hundred crayfish from several widely separated localities in South- 
western Australia. Most of these were received from Mr. Wood- 
ward who made special efforts to secure good series of as many 
different species as possible. They represent only three species — 
C. qiiinqnecarinatus, C. tennitnamts, and C. intermedins and hence I 
suppose that no other occurs in that part of the Continent. There- 
fore, the lost C. preissii is identical with one of these, and for 
reasons given below, I believe that one to be C. intermedins. 
According to Erichson the margins of the rostrum are entire 
while he does not note the presence of any keels on the carapace. In 
C. teniiimanns the rostrum is armed with several strong lateral teeth, 
and the carpace bears three keels in addition to the two extending 
backwards from the rostrum. C. qiiinqnecarinatus also has five keels. 
C. interniedius, on the other hand, has only two which are more 
obtuse and less elevated than those of the other species, while the 
teeth of the rostrum are sometimes so small as to be easily over- 
looked ; in addition to these facts, such other characters as 
Erichson has given, agree very well with my specimens of C. 
intermedins . Erichson’s specimen was only three inches five lines 
long, and the chelae measured one inch in length and five lines in 
breadth. These proportions agree much better with Smith’s C. 
intermedins than with another which I propose to separate as var. 
angiisius, in which the chelae are much narrower, particularly in 
young specimens. 
The following are the principal characters of the species as 
exhibited by eighteen specimens 95-161 mm. long from the tip of 
the rostrum to the end of the telson. 
Carapace finely pitted above, minutely tubercular on the lower 
parts of the sides, the tubercles a litile larger anteriorly ; a 
series of slightly enlarged tubercles on the sides behind the cervical 
groove. Two obtuse keels, each terminating anteriorly in a very 
blunt spine or tubercle. Rostrum almost horizontal or obliquely 
deflexed, not reaching the end of the antennal scales; it is flat above 
and the margins are defined by very narrow, scarcely raised keels. 
