BY THE REV. J. E. TENISON-WOODS, F.G.S., F.L.S., ETC. 203 



Prof. McCoy lias shown that the living form is distinct, though 

 resembling it in many respects. It has a very wide range and is 

 rather common. Prof. Agassiz called my attention to the 

 variability of the species and has suggested that my E. tumidus 

 may be one of the varieties. But the two species are so entirely 

 different that the matter will not bear discussion. I intend to 

 publish a figure of E. tumidm, and then this will I think be put 

 beyond a doubt. I have found E. testitudinarius all along the 

 East Australian coast, both within and outside the tropics and 

 have not noticed any great variability in its character, in fact I 

 should have said that it is one of the exceptionally constant species 

 in Australia. 1 obtained one small example from Moreton Bay, 

 which I presented to the National Museum Melbourne, which had 

 a remarkable depression in one of the petals, but this arises clearly 

 from a malformation. The specimen is dwarfed and depressed, 

 but not otherwise different from the normal type. 



Laganum depressum, Lesson, and L. Bonami, Klein, are both 

 rather common on sandy situations, but the species of this genus 

 and Peronella are so extremely alike that unless the interior of the 

 test is examined they cannot be referred with certainty to any 

 genus or species. 



Peronella decagonalis, Lesson, is found of large size at Port 

 Denison and on sandy places all along the inside of the Barrier 

 Reef . It extends to Port Jackson, but there it is only very small. 

 Within the tropics it is very large and of a blood red colour. 

 Though very much depressed at the edges, and seemingly thin 

 and fragile it has a very strong test, and is seldom found broken. 

 It lies on the sea bottom covered with sand, so that without a 

 dredge specimens are not easily obtained. 



Clypeaster humilis, Leske. A very fine specimen of 'this urchin 

 was obtained by Messrs. Haswell and Morton, in Port Denison. 

 This is the first time it has been found on the Australian coasts. 



Echinarachnim parma, Klein, is not so common on the northern 

 coast as I supposed, but Arachnoides placenta, Linn., is very 



