62' W. W. Watts — British Geological Photographs. 



or an Hipparionyx. The mistake was vinfortunate, for it continued 

 the union of two distinct species under the name Spirifera disjuncta, 

 one of which, as Professor Hughes suggested, is the same or a very 

 close ally of the Morte Slate fossil. 



The specimen of " Spirifera disjuncta var. gignntea " came from 

 Tintagel, and that of the OrtJiis hipparionix from Looe. It would 

 be rash to found any argument on the specific relationships between 

 these forms and Dr. Hicks' fossils. But if I had to give the last 

 a name, I should, without much hesitation, call it Hipparionyx afF. 

 proximns, Yanux, and regard it as also closely allied to Orthis 

 hipparionyx, Dav, non Hall, and to Spirifera disjuncta (pars), Dav., 

 var. gigantea, Dav. non Sow. If I am right, the affinities of the 

 species are decidedly Devonian. 



Dr. Hicks is warmly to be congratulated on the success which 

 has attended his persevering and painstaking seai'ch for fossils in 

 such unpromising material as the Morte Slates; and every geologist 

 interested in the Devonian question will feel grateful to him for his 

 addition of this interesting fauna to the materials available for the 

 solution of that problem. The determination of crushed casts of 

 fossils is a task which is always difficult, but is often necessary, 

 and fortunately is frequently possible. The truth is generally 

 reached in such cases by a series of suggestions, of which one 

 after another is shown to be incorrect. Accordingly, the publica- 

 tion of this note may help in the final determination of the age 

 of the Morte Slates, even though its conclusion that the affinities of 

 the fauna are Devonian rather than Silurian be proved erroneous. 



III. — Note on Bkitish Geological Photogkaphs. 



By W. W. "Watts, M.A., F.G.S. 



[Continued from the January Number, page 37.) 



(PLATE II.) 



IN illustration of the article on this subject published in last 

 month's Geological Magazine, three plates have been prepared 

 by the kind permission of the photogi'aphers, and of the editors of 

 the publications in which they originally appeared. One (namely 

 Plate II) is now issued, and Plates III and IV will be given in the 

 March number. 



Plate II, which has been lent bj' the publishers of The Irish 

 Naturalist for January, 1893 (vol. ii), by kind permission of 

 Messrs. G. H. Carpenter and E. Lloyd Praeger, represents the 

 remains of a windmill pump photographed by Miss M. K^ 

 Andrews. This was erected in 1824 or 1825 to remove the water 

 from an old quarry, and in 1829 is known to have been 50 feet 

 from the sea. It was, when the photograph was taken, 50 feet 

 outside high-water mark, and Miss Andrews informs me that it was 

 completely washed away by the great storm in December, 1894, so 

 that the photograph is the only record that we possess of it. 



