34 Reviews — Richthofen s Atlas of China. 



the work of succeeding palaeontologists ; and Prof. Lindstrom has 

 undertaken the desirable task of investigating its character. This 

 memoir contains the results of his studies of the Silurian Crustacea 

 of Gotland, from which locality 70 species of Trilobites, and two of 

 Merostomata, are enumerated and described. New species belonging 

 to the following genera are introduced, viz. Phacops (1) ; Cheirurus 

 (1) ; Sphcerexochus (2) ; Liclws (6) ; Harpes (1) ; Calymene (5) ; 

 Phaetonides (2) ; Cyphasphis (1) ; Proetus (6) ; Illcenus (2) ; and 

 Bronteus (3). A new genus, Youngia, based on the characters of 

 Cheirums trispinosus, Young, is formed, and includes two new species. 

 Most of the forms are fragmentary, but the portions preserved retain 

 their surface characters so perfectly, and these have been so clearly 

 and exactly described and figured in the plates and woodcuts, that 

 there should be no difficulty in identifying them. Prof. Lindstrom 

 gives a table showing the distribution of the species in the four 

 divisions of the Gotland strata, which correspond respectively to our 

 Upper Llandovery, Wenlock Shale, Wenlock Limestone, and Ludlow 

 beds ; and from this it appears that in Gotland the Wenlock Lime- 

 stone is the richest in species ; that there are three species peculiar 

 to the Upper Llandovery, ten to the Wenlock Shale, eleven to the 

 Wenlock Limestone, and four to the Ludlow beds. Some species, 

 as Sphcerexochus scabridus, Encrinurus punctatus, and Illcenus barriensis, 

 appear in all the divisions, whilst all the species of Lichas are 

 limited to the two upper divisions. Prof. Lindstrom further states 

 the noteworthy fact that not one of these species is found in the 

 strata below the marly shales, which are the equivalents of the 

 Upper Llandovery, in Sweden. Calymene Blumenbachii has been 

 reported to occur in underlying beds, but according to Lindstrom, 

 the head-shields attributed to this species, found in West Gotland 

 and in Dalecarlia, are too badly preserved to admit of satisfactory 

 recognition. G. J. H. 



II. — Atlas von China. Orographische und Geologische Karten ; 

 von Ferdinand Freiherr von Eiohthofen, zu des Verfassers 

 Werk : China, ergebnisse eigener Keisen und darauf gegrundeter 

 Studien. Erste Abtheilung : Das Nordliche China. Berlin, 

 Dietrich Eeimer, 1885. 



Atlas op China. Orographic and Geological Maps, by Ferdinand 

 Freiherr von Richthofen, for the Author's work on China. 

 First part, Northern China. 



THE construction of a series of geological maps of such a vast and 

 comparatively unknown country as China, must be a difficult 

 and arduous task, even in the hands of such a competent geologist 

 as Prof, von Eichthofen. And yet in this Atlas we have, in addition 

 to the orographical maps, thirteen large maps, each representing an 

 area of 78,000 square kilometres, on which the boundaries of the 

 principal geological divisions of Northern China are delineated with 

 great apparent precision ! The basis of the work rests on the 

 author's observations during his travels in the country, but these of 

 course were limited to the comparatively narrow strip of territory 



