60 GEOLOGICAL MEMOIRS. 



from the sides towards the middle. Calc-spar is ahvays the most 

 plentiful constituent, and is never absent when Ozokerite occurs. 



The rocks of this district have a conformable stratification, the 

 strike being hor. 4, 2 ; and the dip 12° S.S.E. Nowhere is an in- 

 trusion of the cleft visible in the schist formation, nor in the neigh- 

 bouring rocks. The sandstone in its neighbourhood is either of a 

 pale colour or bleached, and contains only sulphur-pyrites in little 

 nodules. The red colour of the sandstone layer, noticed above as an 

 intermediate stratum of the greenish-grey sandstone, is quite distinct 

 from the cleft, and independent of the occurrence of the Ozokerite. 

 The coal of the '* upper bed," from the deepest part of this pit, 

 which, with the exception of the somewhat variable uppermost bed, 

 the so-called roof- or first-coal, is of very good quality, is nearly 

 throughout this part of the district subject to discharges of combus- 

 tible gas. We may perhaps presume that the origin of the Ozokerite 

 is connected with this condition. The circumstance of no connexion 

 being proved to exist between the Ozokerite gas and the coal beds in 

 this pit, constitutes no objection to this connexion existing elsewhere. 



The Ozokerite of Wettin, in its occurrence in the neighbourhood 

 of coal beds, resembles the Ozokerite of Slanik in Moldavia, that of 

 Gresten near Gaming in Austria, and that of Newcastle-on-Tyne. It 

 has a yellowish-green colour, and is so soft that it may be kneaded 

 between the fingers. [T. R. J.] 



On the Crinoidea of the Jura Formation. By P. Merian. 



[Basel. Verhandl. 1846-1848, viii. 27-29, and Leonhard u. Brorm's Jahrb. f. 

 Mineral. 1849, p. 876.] 



This notice is supplemental to a communication previously made on 

 the subject by Desor. Apiocrinus Meriani [Desor], Goldfuss, pi. 55 

 (with the exception of fig. D, which is A. Roissyanus, D'Orb.), be- 

 longs to the so-called Sequanian formation, — the lowest portion of 

 the Portland oolite, where it commences to be coralliferous, imme- 

 diately above the coralline oolite. This species is often confounded 

 with A. rotundus, Miller, which occurs much deeper, in the Bradford 

 clay. The former is distinguished from the latter '* by two small 

 accessory plates between the two middle pieces of the body ; further, 

 the basal pieces form a great part of the cavity, nearly as great as 

 that of the first middle pieces in A. rotundusr MiUericrinus (Po- 

 matocrimis) Hoferi, from the same formation, is a species Avith a 

 semiglobular body, and by its uppermost column-joints is allied to 

 M. mespiliformis, Schlot. sp. ; it has been already figured by Hofer, 

 Act. Helvet. iv. no. 48. pi. 8. fig. 19-21, and only lately again dis- 

 covered by Koechlin. MiUericrinus polycyphus, Agass. [Desor?], 

 was until lately known only by its stem-joints, which occur ^vith the 

 heads and other parts of If. rosaceus, Des. [Schlot. sp. ?], in the lower 

 beds of the coralline oolite, in the terrain a chailles. Chr. Buck- 

 hardt has now however discovered near Fringeli, in the Canton Solo- 

 thurn, the body portion of M. polycyphus, which turns out to be a 

 species of Apiocrinus. [T. R. J.] 



