574 Correspondence — Dr. W. T. Blanford. 



Sqtjalodontidje. 

 Squalodon antverpiensis, van Beneden. 



DeLPHINIDjE. 



Orca citoniensis, Capellini. I Delphinoid genus, non det. 



Globicephalus uncidens (Lankester). i 



3. "On a Jaw oi Hy other ium from the Pliocene of India." By B. 

 Lydekker, Esq., B.A., F.G.S., etc. 



Colonel Watson, the Political Besident in Kattiawar, had recently 

 sent to the author a fragment of a left maxilla with the three true 

 molars from Perim Island, in the Gulf of Cambay. The specimen 

 belonged to Hyotherium, and apparently to an undescribed species, 

 the differences between which and the several forms previously known 

 from various European and Asiatic beds, were pointed out. The 

 author also called attention to the peculiar association of types found 

 in the beds of Perim Island, and to the affinities of the genus 

 Syotherium with the recent Sus and Dicotyles on the one hand, and 

 with the Upper Eocene Chceropotamus on the other. 



COIEaiRIEiSIE'OIN'IDIEIN-OZE:. 



THE FACETTED BLOCKS PBOM THE PUNJAB SALT EANGE. 



Sir, — Had I been aware that the abstract of my remarks "On a 

 Smoothed and Striated Boulder from a Pretertiary Deposit in the 

 Punjab Salt Bange " would appear in the Geological Magazine, 

 together with Mr. Wynne's notes on another facetted fragment from 

 the same bed, I would have asked permission to add a few observations. 



The great difficulty in accounting for the origin of these facetted 

 blocks is that whilst the smoothed surfaces are in every respect similar 

 to those on stones worn by glacial action, no fragments from moraines, 

 from boulder-clay, or from other glacial deposits are known to exhibit 

 the peculiar facetting characteristic of the present specimens. I have 

 heard of something similar, but have not seen an example. Other 

 geologists who have a wide experience of smoothed and striated 

 boulders are equally puzzled. 



At the British Association meeting two suggestions were offered as 

 to the cause of the markings — the first was soil cap action ; this, 

 however, could not have produced the facets, nor, unless it acted in 

 two or more directions at the same time, could it have caused the 

 striation. The other suggestion was wind and sand action, by which 

 similarly facetted blocks are said to have been produced in Australia. 

 My objections to this view are that wind and sand action never, so far 

 as I have seen, produce plane surfaces, that the striation (or rather 

 grooving) on wind-worn surfaces is of a different character, and that 

 the wind-worn fragments sent from New Zealand by Mr. Enys, and 

 figured in the Quart. Journ. Geol. Soc. for 1878 (xxxiv. p. 86), as well 

 as some described in the American Naturalist (occurring, I think, in 

 Maine), have no resemblance to the Punjab specimens. Further and very 

 cogent arguments are supplied by Mr. Oldham in a paper which I trust 

 will shortly be published in this Magazine. 



Before concluding, may I point out that felspar-porphyry on p. 494 

 is a misprint for felsite-porphyry. 



Nov. 8th, 1886. W. T. Blanford. 



