Dr. G. J. Hinde — Fragments of Chert from N. China. 255 



species from North China, but I feel before doing so the need of 

 better and more complete specimens at my command upon which to 

 found a revision. I can, therefore, only express my thanks to 

 Herr Monke for the valuable work he has accomplished with the 

 very fragmentary material at his command. I have also to tender 

 my best thanks to the Kev. Samuel Couling for entrusting me 

 with all the specimens he was able to obtain and presenting them 

 to the Geological Department of the British Museum (Natural 

 History), Cromwell Eoad. 



EXPLANATION OF PLATE XIII. 



The photo reproduction of fossil remains shown on our plate has been taken from 

 a portion of a large slab procured by the Rev. Samuel Couling, M.A., of Kiao-chow, 

 North China, and in age considered by Herr H. Monke to be Upper Cambrian. 

 The slab and its trilobites agree exactly with a number of others obtained for the 

 Royal Prussian Geological Survey and Berg-Akademie in Berlin from Yen-tsy-yai, in 

 the Province of Shantung, North China. Size of original slab, 250 x 205 mm. 

 Size of portion of slab reproduced in plate, 180 x 112 mm. On the slab may be 

 seen examples of the following genera and species, indicated by small figures on the 

 margin of the plate, and in the case of Fig. Ion the fossil slab itself: — 

 Fig. 1. — Free-cheeks of Stephanocare RichtJiofeni (very numerous). 



,, 2. — Pygidia of Stephanocare Richihofeni (seven examples). 



,, 3. — Pygidia of i^rejyawfWff Preweswi^i, Berg, (five examples). 



,, 4. — Free-cheek with cheek-spine of Drepannra Ketteleri (one example). 



,, 5. — Head-shields and pygidia of ^^?20s^?(s Xoer/m (numerous) . 



,, 6. — Hypostome of Stephanocare Richthofeni (one example). 

 This slab, together with various other separate Trilobite remains and some 

 Clephalopods, have been presented by the Rev. Samuel Couling, M.A., to the Trustees 

 of the British Museum (Natural History) for the Geological Department. 



III. — Note on Fragments of Chert from North CHI^^A. 



By Dr. George J. Hinde, F.R.S., F.G.S. 



rpHE fragments of partially weathered chert from North China 

 JL sent by the Eev. S. Couling,' unfortunately without indication 

 of the particular locality or formation where they were collected, are 

 of whitish, slate-grey, or pinkish aspect, and in two instances show 

 traces of banded structure. They consist of cryptocrystalline or 

 microcrystalline silica with small areas in which the silica is of 

 a fibrous chalcedonic character. Remains of organisms can be 

 distinguished in each of the four microscopic sections which have 

 been prepared, but they are generally so shadowy and indefinite 

 that their nature cannot be satisfactorily determined. Some portions 

 of slide marked A are crowded with slender, straight, or slightly 

 curved linear bodies, about •!! mm. in length by "01 mm. in width, 

 which in places have a sub-parallel or sheaf-like arrangement. 

 They might be supposed to be sponge spicules, but in their size and 

 disposition they seem to difi'er from any fossil spicules with which 

 I am acquainted. Slide C largely consists of numerous small, 

 rounded, oval, and conical forms without walls, ranging from 

 "1 to 1-7 mm. in diameter. In outline and in size many of these 



1 Of Ching-chow-fti, Kiao-chow, Shantung, North China. 



