225 



Specimens of this freshwater entomostracan were collected 

 by me some two or three years ago in abundance at Geilston. 

 It is an interesting form, as it affords us valuable information 

 regarding the condition under which opal-like rock was 

 formed prior to the peculiar change in its structure. 



DISCOVEEY OF A CONE, PROBABLY OF A SPECIES 

 OF LEPIDOSTROBUS, IN THE SANDSTONES 

 OF CAMPANIA. 



By Eobt. M. Johnston, F.L.S., Etc. 

 [Bead June 13, 1882 ; accidentally omitted from Proceedings of 

 the year 1882.] 

 The very interesting impression in the block of sandstone 

 appears to be the remains of a narrow, oblong, cylindrical 

 strobilus, or cone, of a species of Lepidostrobus. It 

 measures about 4i inches long and f inch in diameter. 

 The strobilus agrees with general characters of the 

 genus Lepidostrobus, having a central axis through- 

 out its whole length, which is longitudinally striated, 

 from whence radiate upwards and outwards narrow chambers, 

 which evidently contained the sporangia. These chambers 

 narrow and bend downwards abruptly towards the outer 

 edge, where, if a section could be seen, it would, no doubt, 

 show an imbricated appearance. So far as I can learn this 

 is the first strobilus or fruit of a form of Lepidodendron 

 discovered in Australia. Associated with the fruit, in a layer 

 of shale, I discovered impressions of numerous microscopic 

 wing-like seedlets, some of which I have magnified ; these 

 latter are frequently depressed near the centre and are almost 

 invariably concentrically striated Impressions of Zeugo- 

 jphyllites are also abundant in the shales associated with the 

 sandstone, which I believe to be of the same horizon as the 

 Jerusalem coal. I propose for this fruit the name of Lepi- 

 dostrobus Muelleri, in honour of Baron von Mueller, K.C.M.G-., 

 F.E.S., etc. (See Figure.) 



