SOCIETY OF PHYSICS AND NATURAL HISTORY OF GENEVA. 305 



glacier of Tiefen, near Gallenstock, in the canton of TJri. A fine group 

 of these crystals lias been given by Madame Revilliod De La Eive to 

 our new library and will form one of the ornaments of the Eevilliod hall. 



M. Ernest Favre read a memoir on the fossil mollusks of the environs 

 of Lemberg, in Gallicia. The fossils described were furnished by two 

 principal repositories : Xagorzany and Lemberg. At the latter, the 

 formation is constitnted by a very line and comi^act calcareous marl, 

 forming a bank which exceeds 145 metres, (470 feet.) The rock of Xa- 

 gorzany is a yellow, hard sandstone, in thick banks, alternating with 

 strata of soft limestone. M. Favre has recognized in his fanna one hun- 

 dred and seventy well-distinguished species of mollusks. The cephalo- 

 pods abound at N^agorzany. They comprise eighteen species, of which 

 the most characteristic is the Belemnitella mucronata. Here also the 

 gasteropods are numerous and varied, amounting to one-half of tlie 

 feuna. At Lemberg they are represented by only twenty-six small and 

 scanty species. Of the acephala, forty-six species are found at Lemberg 

 and thirty-two at Nagorzany. The brachiopods number eleven species, 

 four of which are common to both localities. The fossil mollusks found 

 in Gallicia characterize the lower part of the chalk A BelemniteUa mucro- 

 nafa, and, consequently, the senouian formation, iwesenting the greatest 

 analogy with the chalks of Westphalia, Luneburg, and the Isle of Eugen, 

 as well as with the senonian formations of Limburg, Hainault, and the 

 basin of Paris, which all number species common with those of Lemberg. 



M. De Loriol presented a memoir which lie has recently published in 

 conjunction with M. Gillieron on the urgonian stratum of Landeron. 

 The fauna of this stratum forms a transition between that of the neoco- 

 mian and that which characterizes the lower urgonian stratum. This 

 fauna comprises a great number of Simngitaria as well as numerous indi- 

 viduals of a Comatula with single arms, pertaining to the new genus 

 Oiihiocrina. 



§ 6. — Botany. 



The most prominent fact which has distinguished our sessions, so far 

 as botany is concerned, has undoubtedly been the liberal donation which 

 Madame Delessert and her two daughters have made to the city of 

 Geneva of the rich and celebrated herbarium of the Baron Francois 

 Delessert. 



This collection forms one of the twenty or twenty-one largest herba- 

 riums in existence, and it is especially remarkable on account of the 

 great number of specimens described and mentioned by ancient or mo- 

 dern authors. Independently of the types described by Lamarck, La- 

 billardiere, Richard, Palisot, De Beauvais, and others, whicli are in the 

 general herbarium, it comprises moreover that of the Burmans, which 

 includes the types of the older botanists, especially those of Thuuberg 

 and of the Burmans themselves, besides a herbal of Lapland, collected 

 and named by Linnaeus. The plants of India, arranged by AYallichj 

 form one of the most extensive collections whicli exist on the continent. 

 This Delessert herbarium will be found in future in convenient prox- 

 imity with the rich collections of MM. De CandoUe and Boissier, which 

 were already of easy access to botanists, so that the one will be com- 

 pleted by the others, thus affording facilities for the most thorough 

 study. 



It is to M. Alphonse de Candolle, than whom no one can better appre- 

 ciate the importance of this gift to our city, that I am indebted for the 

 above particulars. It was from him also that the society received, on 

 the authority of a letter from M. De Gelaznow, director of the Agricul- 



20 s 69 



