Dr. A. Smith Woodward — Keupev Footprints. 217 



The slab No. IV (Fig. 2), with impressions apparently of skin, is 

 about six inches square, and the reticulated markings extend over two 

 ill-defined but separate areas. One of these patches is convex and 

 very suggestive of being a portion of the counterpart of a footprint, 

 but there are no marked boundaries. The small polygonal raised 

 areas enclosed by the I'eticulate markings vary in size in different 

 parts from 00015 m. in diameter to 0-004 m. At one side of the slab 

 is an indistinct portion of a small footprint resembling i2A^rjcAosa?erMS. 



Fig. 2. — Skia impression; iootpiiut di Ulovirotlierium (?). 



On comparing this fossil with known specimens, its resemblance 

 to the skin-impression in a Oheirotherian footprint described by 

 Professor Williamson ^ is seen to be very striking. There is also 

 a sun-cracked slab in the British Museum (No. E. 295) from 

 the Trias of Lymm, Cheshire, upon which a number of small 

 Rhynchocephalian footprints are associated with scattered indistinct 

 reticulate markings and enclosed raised areas of a somewhat similar 

 character. 



Footprints and impressions are under all circumstances most 

 unsatisfactory fossils to interpret, but it now seems quite certain 

 that Sir Richard Owen's determination of those of Bhynchosaurus 

 is correct. It may be convenient to add, in conclusion, that an 

 elaborate synopsis of all that is known regarding such fossils, with 

 full references, was published by Dr. T. C. Winkler in 1886.^ Later 

 valuable contributions to the same subject have been made by 

 Herr Pabst^ and Mr. Beasley.'' 



1 W. C. "Williamson, " On a Oheirotherian Footprint from the Base of the Keuper 

 Sandstone of Daresbury, Cheshire" : Quart. Journ. Geol. See, vol. xxiii (1867), 

 pp. 56-7, pi. iii. 



2 T. C. Winkler, " Histoire de I'IchnoIogie " : Archiv. Mus. Teyler [2], vol. ii, 

 pt. 4 (1886). 



^ "W. Pahst, " Thierfahrten aus dem Oberrothliegenden von Tambach in 

 Thiiringen": Zeitschr. deutsch. geol. Ges., vol. xlviii (1896), pp. 638-643, 

 pi. xiv ; and vol. xlix (1897), pp. 701-712, pis. xxv-xxviii. 



* H. C. Beasley, "An Attempt to classify the Footprints in the New Ked Sand- 

 stone of this District": Proc. Liverpool Geol. Soc, vol. vii (1896), pp. 391-409, 

 pis. i-iii. " Notes on Examples of Footprints, etc., from the Trias in some Provincial 

 Museums" : loc. eit., vol. viii (1898), pp. 233-237, pi. xi. 



