Miscellaneous. 481 



PROCEEDI^^GS OF LEARNED SOCIETIES. 

 GEOLOGICAL SOCIETY. 



February 8, 1893.— W. H. Hudleston, Esq., M.A., F.ll.S., 

 President, in the Chair. 

 The following communication was read : — 



"Note ou a Radiolariau Rock from Fanny Bay, Port Darwin, 

 Australia." By G. J. Hinde, Ph.D., V.P.G.S. 



A specimen brought from Fanny Bay by Captain Moore, of 

 H.M^.S. 'Penguin,' is of a dull white or yellowish tint, in places 

 stained red. It has an earthy aspect, and is somewhat harder than 

 chalk, but gives no action with hydrochloric acid. Microscopic 

 sections show a fairly transparent groundmass, apparently amor- 

 phous silica, containing granules and subangular fragments up to '075 

 millim. in diameter, some of which appear to be quartz. 



Besides this, the rock contains numerous radiolaria, and it is 

 really a radiolarian earth intermediate in character between the 

 Barbados earth and such cherts as those of the Ordovician strata of 

 Southern Scotland. 



The details of the extent of the deposit and its relationship to 

 other rocks of the area are not yet obtainable, though it is possible 

 that a considerable thickness of rock mentioned by Mr. Tenison 

 Woods as occurring in this area may also be of radiolarian origin. 



The Author describes a species of Cenellipsis, two of Asfro/ihacus, 

 one of LitJioci/clia (ne^^•), one of Ampliihrachium, three of Spongo- 

 discus(one new), four of tS2>ongohtia(nl[ new), two of Dicti/omitra\hoi\i 

 new), one of Lithocampe (new), and two of Sticliocapsa (both new). 



From these it is not practicable at present to determine the geo- 

 logical horizon of the rock ; with one exception, all the genera 

 represented occur from Palaeozoic times to the present. 



MISCELLANEOUS. 



Notes on Chceropsis liberiensis {Mortmi). 

 By Henry C. Chapman, M.D. 



It is well known that the late Dr. Samuel G. Morton, regarding 

 certain peculiarities presented by the skull of the hippopotamus 

 inhabiting the west coast of Africa as specific in character, proposed, 

 in communications made to the Academy *, that the latter should 

 be distinguished from that of the east coast as Hippopotamus minor, 

 afterwards liberiensis, the former retaining the name of Hippopo- 

 tamus ampliihius given to it by Linnaeus f. The Academy having 

 afterward actpiired an entire skeleton of the Liberian hippopotamus, 

 the late Dr. Leidy took up anew the study of its osteology, and 

 more especially of the skull. After a most careful comparison of 

 the skulls of the two species Dr. Leidy came to the conclusion that 



* Proc. Acad. N. S. 1844, vol. ii. p. 14 ; Join-n. A. N. S. vol. i. 1849, 

 p. 231. 



t Syst. Nat. ed. 12, vol. i. p. 10 (17G6). 



Ann. & Mag. N. Hist. »Ser. 6. Vol. xi. 35 



