Correspondence. 171 



Land Mollusca. 



Testacellus Maugei ? from St Mary's. Helix, new species? from St Michael's 

 Vitrina Lamarkii ? from St Michael's. and St Mary's. 



Helix aspersa, from St Michael's. „ new species ? from St Michael's 



,, lactea, from St Mary's. and St Mary's, 



„ lenticulata, from St Michael's Bulimus decollatus, from St Mary's. 



and St Mary's. „ species allied to B. pupa ? from 



„ rotundata, from St Michael's and St Michael's and St Mary's. 



St Mary's. „ new species ? from St Michael's. 



„ crystallina, from St Michael's. ,, ventrosus, from St Mary's. 



,, cellaria or lurida, from St Mi- Zua luhrica, from St Michael's. 



chael's. Balea fragilis, var., from St Michael's. 



„ rubescens, var., from St Mi- Pupa compostoma ? from St Michael's. 



chael's. Limax cinereus, from St Michael's. 

 „ new species, like arbustum, from 



St Michael's. 



Seliuyn on Australian Geology. — The following notice of various 

 points connected with the geology of the colony of Victoria, is ex- 

 tracted from a letter (19th May 1854,) from Mr Alfred Selwyn 

 to Professor Ramsay : — High results would accrue to geological 

 science were more of our colonies examined in the able and syste- 

 matic manner followed by Mr Selwyn, who has now been for about 

 two years in charge of the geological survey of the colony, after 

 having been for about six years actively and ably engaged in the 

 geological survey of Great Britain. The notice possesses a melan- 

 choly interest from the mention of that gifted man, whose untimely 

 death will long be felt and deplored by geologists in every quarter 

 of the world. 



" For the last three months I have been at work between Mel- 

 bourne, Port- Philip Head, and Western Port Bay. I have found 

 and collected a considerable number of tertiary fossils, mostly in 

 a stratum of blue stiff clay, containing bands and nodules of hard 

 grey limestone, with veins containing sulphur and fine crystals of 

 selenite, the whole very like the London clay, or Barton Cliff, 

 Hampshire. Among the fossils are terebratula, and a few other 

 bivalves, turitella, vermetus, patella, nautilus, murex, buccinum, 

 &c. I shall send a quantity home to Forbes by first opportunity. 

 I have found them in only one place, on the east side of Port- 

 Philip Bay. 



" I think I mentioned in my last, that I had found fossils, ap- 

 parently Lower Silurian, in the auriferous rocks at Mount Ivor, 

 fifteen or twenty miles east of Mount Alexander. 



" Another matter of great interest, and one I mentioned in a 

 letter to Jukes some twelve months since, is now proved beyond a 

 doubt, viz., the extension of the auriferous drifts under the great 

 lava plains of the rivers Loddow, Campaspie, &c. At the very 

 place where I first saw some evidence of such being the case, 

 they are now sinking through the lava down into the auriferous 

 drift. I have also lately seen several small grains of native tin 



