1867.] Geology and Paleontology. 537 



Ammonites and the Madreporaria may range out of their supposed 

 restricted zone, or not even be represented in certain portions of its 

 area." In point of fact, Dr. Duncan is one of the few palaeontologists 

 who can view the birth and death of the life of a period as symbo- 

 lized by a line that is elastic, and not rigid. 



Mr. Salter's contribution to this volume, being Part IV. of his 

 Monograph of British Trilobites, consists almost entirely of de- 

 scriptions of the species of the genus lllsenus and of its subgenera ; 

 Mr. Davidson continues his description of the Silurian Spiriferidse 

 and commences that of the Bhy-nchonellidss ; and Professor Phillips 

 makes considerable progress in the description of the Liassic 

 Belemnites. 



The volume is illustrated by forty well-executed plates, which 

 are mostly beautiful specimens of scientific lithography, some being 

 English and some French. 



The most recent publication of the Geological Survey of India, 

 another contribution to Indian Paleontology,* is a work of more 

 than Indian importance. It contains the first portion of Dr. 

 Stoliczka's description of the Gasteropoda of the Cretaceous rocks of 

 Southern India, including the Pulmonata and the siphonostomatous 

 Prosobranchia ; but its general interest will be due to its containing 

 an elaborate essay on the classification of the Gasteropoda — the 

 illustrative examples being necessarily chosen from the Cretaceous 

 fossils of Southern India. It will be sufficient for us to mention 

 here that Dr. Stoliczka's plan is to subdivide the old generic groups, 

 such as Fusus, Murex, &c, into a number of smaller groups which 

 he considers to be still of generic value. Although, in this course, 

 Dr. Stoliczka has to some extent followed many able conchologists, 

 the plan has not yet found much favour with British palaeontologists. 



The Journal of the Koyal Geological Society of Ireland contains 

 several meritorious papers on drift deposits and theories of denuda- 

 tion. Our space will not admit of our giving analyses of these 

 memoirs ; but we may especially draw the attention of our readers 

 to Mr. G. H. Kinahan's " Notes on some of the Drift in Ireland ; " 

 and to a very elaborate essay by the Kev. Maxwell H. Close, " On 

 the General Glaciation of Ireland." 



In a communication to the Koyal Institute of Lombardy,f Sign. 

 Lombarclini describes some traces of the Glacial period which he had 

 observed in the great depression of Central Africa. He therefore 

 infers that confirmatory evidence will be found in the mountainous 

 districts of Abyssinia, and in the more southern and tropical regions 

 of Kenia and Kilimandjaro. Collating his results with those of M. 

 Eeclus in the Sierra Nevada, and of M. Agassiz in Brazil, he comes 



* Palseontologia Indica, vol. v.. fasc. 1-4. 



t Kendiconti del Kealo Istituto Lombardo di Scienze c Lettere. Classe di 

 Scienze Matematiche e Natnrali, vol. iii., lasc. 3, p. 85. 



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