18 Scheerer — Occurrence of Silver at Kongsherg. 



the pinnulEe. In those genera again where these pinnulas are absent, 

 as in Anthocrinus and C'upressocrinus, the theory may be so applied 

 that the ova, etc., had their place on the interior surface of the arms, 

 covered by the membranaceons envelope of the arms. Or it may be, 

 that in the last-mentioned genera, the sexual organs were placed in 

 the interior of the pelvic cup, as can be assumed with certainty to 

 have been the case with the Cystidea and the Blastoidea. In no 

 typical Sea-lily, again, whether recent or fossil, has there ever been 

 seen any opening on the calyx, that could be supposed to be sexual. 



Lastly, our author most peremptorily protests against the opinions 

 of some palasontologists, who consider the long tube seen on the apex, 

 or near the apex of the upper side of the calyx, as a proboscidean 

 mouth, or feeding tube. So, for instance, when M. de Koninck says 

 that there is a circular opening on the apex of his Cyathocrinus, and 

 that its borders are lengthened to a short tube, or proboscis, which he 

 calls the mouth, and that the anal vent is lateral. Dr. Liitken is of an 

 opinion quite contrary. In the existing Sea-lilies, no zoologist ever 

 found a proboscidean mouth, only a circular vent, but the intestine 

 always ends in a short or long proboscidean tube. Even if this tube 

 is situated near the centre of the calyx, or at it, it does not thence 

 necessarilly follow that it is the mouth. In some of the recent 

 specimens, as Actinometra, the mouth is excentric, situated near the 

 margins, and the arms cetnral. ''It is the form, and not the place, 

 that must decide if it is the anal-tube, or the mouth." Still, the 

 author grants, that there may be a possible exception in the case of 

 Marsupioa'inus, as stated in Siluria, and by Mr. Yandell. 



The memoir deserves to be studied by all palgeontologists working 

 at these beautiful fossils, its true merits cannot be fully discussed in 

 a short abstract. 



n. — ^Verdhandltjngen dhs Bergmannischen Vereins zu Freiburg.^ 



EOFESSOE Scheerer, councillor of niines, completed his remarks 

 " on the Occurrence of Silver at Kongsberg.'^ 



The district in which the Kongsberg mines have been worked for 

 nearly 250 years consists of crystalline schists (placed by Kjerulf 

 and Dahll in the oldest known azoic formation) ; they are mainly 

 micaceous, hornblendic, chloritic, and quartzose schists, besides 

 numerous subordinate varieties, and they appear in beds alternating 

 with one another repeatedly and without any definite order. 



The strike of the rock in this district is mainly North and South, 

 and the dip is very steep, and even perpendicular in places. Some 

 of the beds are remarkable for being impregnated with pyrites (iron 

 pyrites, magnetic pyrites, copper pyrites) and still retain their old 

 names of Fall (or Fahl) bands. They are crossed by numerous 

 small veins, seldom more than a few inches wide, which run from 

 East to West, and are filled up mainly with Calc spar, Heavy spar, 



1 Proceedings of the Mining Society of Freiburg, at a meeting held 3rd April, 1866. 

 Extracted from the " Berg-und hiittenmannische Zeitung," 16th July, 1866. 



2 Based on the paper entitled " Betankning af den ved Kongelig Resolution af 10 

 Juli, 1865, naadigst nedsatte Commission angaaende Kongsberg Solvvark." 



