118 



Scientific Intelligence. 



Mr. Cooley, as has already been said, criticises in some respects the 

 views of Erhardt concerning the extent of this inland sea. Dr. Petermann, 

 in admitting the force of Cooley's observation, has drafted another chart 

 indicating his belief in regard to the boundaries of a great body of water, 

 the existence of which is beyond dispute. A comparison of the two 

 charts of Erhardt and Petermann, will do more than a lengthy descrip- 

 tion to show the points in which these writers differ and agree. 



Information concerning this central lake has been published in Euro- 

 pean journals and elsewhere, since 1845. Dr. Petermann appends to his 

 remarks the following bibliographical notes. 



1. Cooley, W. D. Geography of N'yasi or Great Lake of Southern Africa 

 investigated, (Jour. Roy. Geog. Soc. 1845, vol. xv, pp. 185-235). 



2. Macqueen. Visit of Lief Ben Saeid to the Great African Lake, (ibid, 

 pp. 371-374). 



3. Cooley, W. D. Further Information in reference to N'yasi (ibid. 1846, 

 vol. xvi, pp. 138-143). 



4. Cooley, W. D. Inner Africa laid open, (Lond. Longmans, 1852.) 



5. Brand. Notice of a Caravan Journey from the East to the West 

 Coast of Africa, with remarks by W. D. Cooley, (Jour. R. G. Soc. 1854, 

 vol. xxiv, pp. 266-271). 



6. Church Missionary Intelligencer, since 1850. 



7. Calwer Missions Blatt, since 1850. 



8. Sykes, (Col.) Notes on Central Africa, (Jour. R. G. Soc. 1853, vol. 

 xxiii, pp. 101-119). 



9. Ewald, (H. von.) Tiber die Volker und Sprachen sudlich von ^Ethiopen, 

 (Quitschrift der Deutschen Morgenlandischen Gesellschaft i. pp. 44-56.) 



10. Krapf. Briefe von der Ost Afrikanischen Kiiste, (ibid, ii, pp. 3 1 0-321 .) 



11. Pott, (Prof.), iiber die Kihiau Sprache, (ibid, vi, pp. 331-349.) 



3. Notices of remains of extinct Reptiles and Fishes, discovered by Dr. 

 F. V. Hay den in the Bad Lands of the Judith River, Nebraska Terri- 

 tory ; by Joseph Leidy, M.D., (Proc. Philad. Acad. Nat. Sci., vol. viii, 

 No. 2, p. 72). 



(1.) Pal^eosctncus costatus, Leidy. — The genus and species are 

 founded on a single specimen of a tooth of a lacertian, discovered by Dr. 

 Hayden. 



The crown of the tooth is palmate, with eight radiating costse termin- 

 ating at the margin in more or less developed points. The fang is flat- 

 tened cylindrical, and is hollow ; and it expands into a ridge surrounding 

 the base of the crown. Breadth of the crown 4 lines, length 2-J- lines ; 

 width of the fang 2 lines, thickness 1 line. Whole length of the speci- 

 men 4 lines. 



(2.) Trachodon mirabilis, Leidy. — The genus and species are founded 

 upon specimens of teeth, generally very much worn and in a fragmentary 

 condition, of a herbivorous lacertian reptile allied to the Iguanodon, dis- 

 covered by Dr. Hayden. 



One of the specimens of teeth is an unworn crown, about 14 lines 

 long and 5 lines in diameter at its thickest part. It has the form of a 

 slightly bent hexahedral column, bevelled off convexly from the summit 

 of the tooth internally to the base externally. The outer surface is smooth, 

 and has a prominent median ridge and prominent subacute lateral bor- 



