432 Miscellaneous. 



5-racTiate star in the centre, some have only a round spot. Tlie 

 second kind of fossil is a snail-like irregular spiral of 1" diameter, 

 and its foraminiferal character is still very doubtful. Both will be 

 very soon figured and described. 



Yours truly, 



Anton : Fritsch, M.D. 

 EoTAi Bohemian Museum, 



Prague, July, 1866. 



nVLlSOIELLJVn^SOTJS. 



Chloropal in Cornwall. — Professor A. H. Church announces in 

 the Chemical Neivs (August 10th), that " Chloropal occurs abun- 

 dantly in a granite quarry close to an old tin-mine known as Carclase. 

 This mine (Wheal Ludcote), now worked mainly for China-stone 

 and China-clay, is not far from St. Austell, in Cornwall. The Chlor- 

 opal occurs witli fluor in the fissures of the granite, and resembles 

 that variety of Chloropal which has been termed " gramenite," from 

 Menzenberg, near Bonn." 



Crystallized Stephanite and Argentite from Cornwall. — On 

 a specimen of indistinctly crystallized Argentite associated with 

 filiform Native Silver, from an abandoned mine, the Wheal Ludcott, 

 near Liskeard, Cornwall, I have observed some very characteristic 

 crystals of Stephanite, the Melan-glanz of the Germans. The crystals 

 are very brilliant and in short prisms about 1^ lines long by 1 

 thick. Colour black, like Iron-glance ; streak black ; before the 

 blowpipe, on charcoal, yields no perceptible trace of Arsenic, but 

 deposits a sublimate of Oxide of Antimony ; and with borax, yields 

 a globule of Silver. Though found in comparative abundance in 

 some countries, it has not hitherto been recorded as occurring in a 

 crystallized state in the British Isles, but is said to have been found 

 massive and pulverulent at Wheal Duchy and Herland, in Cornwall. 

 • In the same locality specimens of Argentite have been found crys- 

 tallized in well-defined cubo-octahedrons, nearly half an inch in 

 thicloiess. These are by far the largest crystals of this mineral yet 

 discovered in Britain. T. D. 



Dr. Greville's Diatomace^. — The extensive collection of Diato- 

 macece, belonging to the late Dr. Greville, together with all his 

 notes and drawings, has become the property of the Botanical De- 

 partment of the British Museum. It includes the specimens of the 

 Eecent and Post-tertiary species described by the late Professor 

 Gregory, many of which are very obscure. Added to the type- 

 collection of Professor Smith, the original monographer of this tribe 

 of British plants now in the Museum, it will make the National 

 collection invaluable to every student of the Biatomacece. 



