122 Notices of Memoirs. 



siderably harder, and of a milky colour. The exterior of the deposit 

 was coated with a hard black rind, miich resembling the charred 

 bark of a tree. Black grains of the same substance in a soft powdery 

 state permeated the mass, which had a cellular and towards the 

 exterior a somewhat fibrous character. The general appearance of 

 the mineral was highly suggestive of a vegetable origin. Pieces 

 with the rind attached, and having a fibrous structure, much re- 

 sembled portions of a gigantic cocoa nut Two specimens were ob- 

 tained from the same place, which have been secured for the Brighton 

 Museum, which were mistaken for the stems of fossil trees, being in 

 the form of a trunk, and described by Mr. J. Howell, of Biighton, 

 as " six inches in diameter, the bark changed into lignite, and me- 

 dullary rays diverging from the centre," The substance on the 

 exterior of the specimens, which so much resembled lignite, has been 

 examined by Dr. Flight, of the British Museum, and has been 

 found to consist of manganese with a certain proportion of cobalt. 

 Both opposite Vernon Terrace and at this locality a layer of chalk 

 flints was continuous through the deposits of Websterite, proving 

 that the original substance which has been replaced by the Websterite 

 was contemporaneous with the chalk. A considerable number of 

 specimens from the excavations in the Montpelier Eoad and Clifton 

 Hill I have presented to the Museum of Practical Geology in 

 Jermyn Street, and to the Brighton Museum. The discovery of the 

 Websterite I communicated to Mr. T. W. Wonfor, of the Brighton and 

 Sussex Natural History Society, and to Mr. J. Howell, of 7, Guild- 

 ford Eoad, who have since investigated the deposits, and have brought 

 a notice of it before the Brighton Society. The finest examples of 

 this mineral which have been obtained from Newhaven, and which 

 were collected by Mr. H. Catt, of Brighton, are in the Pavilion 

 Museum, and are mentioned in "Merrifield's Natural History of 

 Brighton." 



No doubt many deposits of the mineral have been met with and 

 overlooked in excavating for the foundation of houses in this part 

 of Brighton. 



ITOT'IOEiS OIF- ZMZiEnVCOIiaS. 



I. — On some operculated Corals, Silurian and Eeoent. 

 By Dr. Gustaf Lindstrom, "Wisby, Isle of Gotland. 



DUEING the spring and summer last year, I received two speci- 

 mens of the very remarkable four-sided Eugose Coral Gonio- 

 pTiyllum pyramidale, His.,^ by which quite unexpected elucidations 

 concerning the nature of the opercular apparatus of this coral were 

 gained. These specimens are still provided with the operculum, 

 almost complete, in its original position. Far from consisting of 



1 For figures and other details concerning it and some of its congeners, I may refer 

 to a paper in " Ofversigt Vetenskaps-Akademiens Forhandlingar," 1865, p. 271, 

 PI. XXX. and xxxi,, of which a translation is given in the Geological Magazine, 

 1866, Vol. III., page 366, PI. XIV. 



