78 Reviews — Yakowlew's Geology of Charlioic, Russia. 



that all tlie species of Crangopsis described in this mouograjDh are 

 congeneric. In certain of the fossils it is plainly seen that the pleural 

 plates of the second abdominal somite are expanded to overlap the 

 plates in front and behind. Now the only Crustacea \yhich exhibit 

 this character are the members of the tribe Caridea among the 

 Decapoda ; and while it would be rash to assert, without examination 

 of the specimens, that these are really Caridean Decapods (not hitherto 

 identified earlier than the Upper Jurassic), the character deserves more 

 consideration than it has received. 



Space does not permit of further discussion of the numerous points 

 of interest contained in this very important memoir. It deserves 

 careful study not only by palseontologists but also by students of the 

 phj-logeny and classification of recent Crustacea, and the veteran 

 palaeontologist of the Scottish Survey is to be congratulated on its 

 production. 



The way in which this memoir is issued shows little regard for the 

 convenience of bibliographers. It has no number to correlate it 

 with other Memoirs of the Geological Survey, past or future ; it has 

 no index; and the plates bear no legend to indicate their place of 

 origin. 



W. T. Calman. 



II. — PALiEozoic Strata op Chaekow, Eussia. 

 Das Palaeozoicttm im Isjumer Kreise des Governements Charkow. 

 [The Palaeozoic Strata of the Isjumer District in the Province 

 of Charkow, Russia.] By N. Yakowlew. Mem. du com. geolog., 

 St. Petersbourg, 1908 (pp. 1-29). 

 rpHE researches of W. Nalivkin and A. Borissiak dealt with the 

 JL Palaeozoic of the Isjumer district as an undivided whole. The 

 present work attempts a subdivision of the Palaeozoic of that neigh- 

 bourhood, and deals especially with the salt-bearing deposits. The 

 Upper Palaeozoic strata belong to the highest beds of the Donjetz 

 Palaeozoic, and are divisible from above downwards into the following: 



1. Salt -bearing group, with the salt deposits of Slawjansk, 



Bachmut, etc. 



2. Dolomite group, with clays, dolomite, limestone, and gypsum. 



3. Group of sandstones (occasionally containing copper) and 



" Schiefer-Kupfersandstein-Complex [Group] ". 



4. Araucariten group, sandstones and slates with intercalated 



grey, clayey, and unfossiliferous limestones. 



5. Unproductive Carboniferous. 



6. Productive Carboniferous, the top beds only being probably 



exposed. 

 Beds 1 to 4 are placed in the Permo-Carboniferous, while 5 and 6 

 are included in the Upper Carboniferous. The author diflPers from 

 the previous investigators in some of the explanations offered for the 

 tectonic features. The theory given for the formation of the rock- 

 salt deposits in a narrow arm of the sea corresponds to that put 

 forward by Ochsenius. An explanatory map of the locality accom- 

 panies the paper. I. T. 



