202 REPORT ON THK PKNNATL;L,I1JA. 



A further point of interest determined by Panceri is, that there is 

 always a distinct interval between the application of the stimulus 

 and the lirst appearance of phosphorescence, and that this latent 

 period has a very constant duration of l^ths of a second. 



It will be seen that these " phosphorescent orj^ans " of Panceri are 

 the same things as the " hepatic cells " of Gosse, which have been 

 described above both in Penmitula and Fiiiiiculiita. * 

 Geographical Dutrilution — 



Fennatula phospltorea is apparently a common species at various 

 places round the British shores : Ellis says that '• great numbers have 

 been taken on the coast of Scotland, especially near Aberdeen." 



Dr. Gray mentions the coast of England and the Hebrides ; and 

 Kolliker gives as localities, besides the coast of England and Scotland, 

 the Mediterranean, especially Naples and the Adriatic, the coast of 

 France, and the Kattegat; to which Sars adds the whole coast of 

 Norwav, from Frederickshald to Christiansund. 



(To he continued.) 



THE MINERALS OF THE MIDLANDS. 



BY C. J. WOODWAKD, B.SC. 



C Continui'd from page 59. ) 

 As far as I can learn, little has been written respecting the minerals 

 of the Midland district, but I propose now pi-esenting to the readers of 

 the '• Midland Naturalist " abstracts of the papers that have been 

 already published. For this purpose " Ormerod's Index," published by 

 the Geological Society, is invaluable, as it gives an index of localities, 

 with references to papers bearing on Mineralogy that have appeared 

 in the Transactions of the Society. With the help of this index the 

 following abstracts have been prepared :— 



DERBYSHIRE. 



" Notice accompanying Specimens of Lead Ore found in Loadstone 

 from near Matlock, Derbyshire,'' by Charles Stokes, Esq., F.R.S., &c. 

 Read November 3rd, 1820. (Trans. Geolog. Soc. Second Series, 

 vol. i., p. 163, 1824.) " The specimens of galena from the neighboui-- 

 hood of Matlock which accompany this notice are from veins which 

 have been washed with profit in the loadstone as well as in the lime- 

 stone. One of them is from the Side Mine, under the High Tor, the 

 other from the Seven Rakes Mine, on the right bank of the river, not 

 far frona the bridge. Mr. Tissiugton, the owner of the Side Mine, 

 informs me that the veins in all instances he is acquainted with are 

 continued through the loadstone, although they do not bear well in 

 this rock ; and also that a vein frequently changes its degree of 

 inclination iu passing through it, and sometimes after such a change in 

 inclination the vein again returns at an abrupt angle, like a \J placed 

 horizontally." 



* Supra, p. ^. 



