Miscellaneous. 481 



PROCEEDINGS OF LEARNED SOCIETIES. 



GEOLOGICAL SOCIETY. 



February 8, ISiKi.— W. H. JIu.llcstoii, Esq., M.A., F.IJ.S., 

 President, in tlie Chair. 



The fttUowing comraunication was read : — 



"Note ou a Radiolariaa Rock from Fanny Bav, Port Darwin, 

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



A specimen brought from Fanny Bay liy Captain Moore, of 

 H.il 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 uo action with hydrochloric acid, ilicroscopic 

 sections show a fairly transparent groundmass, api)arently amor- 

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

 niillim. 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 tbe 

 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 Astro/ ihacus, 

 one of Lithocfjclia (new), one of Amphibi-achhcm, three oi >Sponr/o- 

 d'iSci(s(one new), four oiS/)ongoleiia(al[ new), two o{ Diet i/oiuifra {both 

 new), one of Lithocumpe (new), and two of Stkhocapsa (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. 



MTSCELI.AXEOUS. 



Notes on Choeropsis liberiensis {Morton). 

 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 llippopotatnus minor ^ 

 afterwards liberiensis, the former retaining the name of Ilippopo- 

 ta ni i(s am2)hibius gircu to it by Linna?us f. The Academy having 

 afterward accjuired 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 ; .loarii. A. N. S. vol. i. 1849, 

 p. 231. 



t Syst. Nat. ed. 12, vol. i. p. 10 (1706). 



Atm. & Mag. N. Hist. Ser. 6. Vol. xi. 35 



