86 Reviews—Dr. G. Lindstrém— Silurian Corals from China. 
work. In its later pages they see before them the present horizon 
of authoritative opinion in Britain in advancing from which they 
have an unfailing means of estimating their onward progress. 
Cuas. LAPWORTH. 
II.—OseErsILuRISCHE KorRALLEN von TsHavu-Tikn 1m NorDOSTLICHEN 
THEIL DER Provinz Sz-TsHwan. Von Herrn G. LinpstR6M, in 
Stockholm. [Upper Srnurian Corats FRoM TsHAvU-TIEN IN THE 
Nortu-Easrern Part oF THE Province §z-Tsowan. By Dr. G. 
Linpstr6m. 4to. pp. 24, with Three Plates. ] 
N this treatise, which will be included in the forthcoming volume 
of the Baron von Richthofen’s great work on China, Prof. 
Lindstrom describes a series of corals entrusted to him for this pur- 
pose, by that distinguished traveller, who collected them in the 
course of one of his journeys in Northern China. The corals are of 
Silurian age; the beds containing them are regarded by Lindstrom 
as homotaxial with the English Wenlock and the Wisby series of 
Gotland. There are in all eighteen species belonging to eleven 
genera. Ten of the species are new forms, and three new genera 
are defined. It is interesting to observe in this outlying Silurian 
area, the occurrence of such familiar genera as Favosites, Heliolites, 
Plasmopora, Halysites, Amplexus, Cyathophyllum, Ptiychophyllum, and 
Cystiphyllum. Of the new genera, the most interesting is a compound 
coral, named Somphopora, with completely perforate walls and six 
short spinous septa in each corallite. It appears to be closely allied 
to the existing genus Alveopora, and furnishes another example of the 
occurrence of corals of the order Perforata in the Paleozoic rocks. 
Another genus, named Ceriaster, in exterior appearance resembles 
Columnaria, but it possesses interior dissepiments and increases by 
intracalicular budding. We may remark that the figures of this 
coral very strongly remind us of the Colwmnaria alveolata, Goldfuss, 
and in another species, C. calicina, Nicholson, the increase is partly 
by calicular gemmation, of an apparently similar character to that 
which takes place in Ceriaster. 
The remaining new genus, Platyphyllum, is, in the form of the cup, 
like Calceola or Rhizophyllwm, and in the interior structure, closely 
similar to Goniophyllum. The summit appears to have possessed 
a single operculum-plate like Calceola, but up to the present the 
operculum of this coral has not been discovered. 
In addition to the description of the new forms, Professor Lind- 
strom discusses some disputed points touching the structure, affinities, 
and synonyms of some of the long-known Silurian corals. We can 
here only refer to one or two of these points, and the first relates 
to the characters of the small tubular structures which intervene 
between the cylindrical corallites in the genus Heliolites. Up toa 
recent period these tabulated tubes were regarded as coenenchymal 
in character, but lately Prof. Nicholson! described them as “ probably 
1 Paleont. 2nd ed. vol. i. p. 221. 
