BY HENRY TRYON. 
65 
Great Britain, figured in the Transactions of the Palseonto- 
graphical Society, one was at once struck with the general con- 
formity between the figures representing the different species of 
Ceratiocaris and the specinrens exhibited. But they were giants 
in those days. The number, twenty-six, given as that of the 
segments comprising the head and body , was two in excess o 
the number for the corresponding parts in the generality ot 
hiing crustaceans, yet many Crustacea of the cretaceous an 
earher geological formations exhibited this gi-eater numerical 
development of their segments. Again, though Apus, and its 
aUy Lepidurus, greatly differed in appearance from the other 
members of tlieir class, yet they strangely recaUed t le oea 
condition of the common crab, or that phase exhibite imme i 
ately on hatching from the egg, which according to the principles 
of evolution represented an ancestral form of that fami ar crus 
tacean. The very general distribution of the species o p 
over the earth’s surface was, too, what might have been expected 
of an animal which had come into existence len ime w 
young. The Society was indebted to ‘Dr. T. D. ^ ^ 
opportunity of exhibiting the specimens. These la eei p 
cured by Mr. G. Drew, at Wompali, in the south-western co 
of the colony, where this crustacean was found plentifully fre- 
quenting the clay pans. Abstract. H.T. 
Note.-Mv. Lower, in commentiug upon the sul^ecL 
referred to au allied form found not uncommonly m the neign- 
bourbood of Adelaide, and which was Lepidurus an a 
a figure representing wdiich had been exlii i e y • 
Dr.I.P.Lcs dso described a <=™f* ““ * 
Murray district, and sought an explanation o le ac 
forms of life appeared suddenly after rain in spots which had 
been previously baked hard by the sun. En. 
