564 Revieivs — Himalayan Triassic Fossils. 



characteristic forms of the Indian Muschelkalk. That the Himalayas 

 do contain, not only Upper Triassic rocks, but beds both of Muschel- 

 kalk and of Ijower Triassic age, there is now no doubt ; in fact, they 

 contain the richest development of the Lower Trias that has hitherto 

 been discovered. 



In the Cephalopod fauna of the Upper Triassic rocks here 

 described, the Nautiloids are represented by the genera Pleuro- 

 naiitilus, Nautilus, Clydonautilus, and OrtJioceras, and the Dibran- 

 chiates by some phragraocones of Atractites ; but by far the larger 

 poi-tion of the fauna consists of Aramonoids. In addition to Hima- 

 layan forms Dr. Mojsisovics also describes and figures a new Didymites 

 (D. afghaniciis) from Afghanistan, and an indeterminable species of 

 Steynarcestes from New Caledonia. Several new genera and sub- 

 genera are proposed ; and altogether seventy species are described 

 as new and are named, whilst many forms which are regarded 

 as new the author considers to be too imperfectly known to be 

 named. So minutely is the fauna described that it amounts almost 

 to the description of individual specimens, for of the seventy new 

 species that are described thirty-three are based upon single speci- 

 mens. All the species are exceedingly well-figured on the twenty- 

 two plates accompanying the memoii". Dr. Mojsisovics arranges in 

 a tabular form the dijfferent zones that he has been able to identify 

 in the Indian Trias Province, and indicates their relation to the 

 zones that have been established in the Mediterranean Trias Province. 

 He considers that the fauna of the Indian Province, although distinct 

 from that of the Mediterranean Province, shows that there was 

 during the Upper Trias period a sea connection between the two 

 regions ; the. Mediterranean Province was, in fact, the westerly 

 extension of the great Triassic sea — named by Professor Suess the 

 Thetys — which occupied the present mountainous regions of Asia, 

 extending in an easterly direction as far as the present Pacific Ocean. 

 The author concludes his memoir with some interesting remarks on. 

 the sea of the Triassic Period. 



(2) Dr. Diener divides his memoir into two portions, the first part 

 dealing with the Muschelkalk fauna of the main region of the 

 Central Himalayas, the second being devoted to that of the Triassic 

 limestones of Chitichun, to the north of the main region. In the 

 fauna of the main region the Nautiloids are represented by the 

 genera Nautilus and Orthoceras ; the Dibranchiates by the genus 

 Atractites ; and the Ammonoids by the genera Ceratites, Darmbites, 

 Japonites, Acroclwrdiceras, Sibirites, Isculites?, Froarcestes, Lobites?, 

 Meelcoceras, Gymnites (with the new subgenus BuddJiaites) , Stiiria, 

 and Ptychites. Thirty-two new species are described ; nineteen 

 are founded upon single specimens, fifteen of which are stated to 

 be in the author's collection, whilst of the thirteen species founded 

 on more than one example, in six cases all the examples of the species 

 are also in the same collection. Dr. Diener agrees with Dr. Mojsisovics 

 in regarding the Muschelkalk fauna of the central region of the 

 Himalaya as a connecting-link between that of the Arctic-Pacific on the 

 one side, and that of the Mediterranean on the other, but points out 



