F. R. Coiqjer Heed — Large Boulder near Royston. 267 



De Koninck figures and describes a foramen in the Belgian examples 

 (with which ours agrees), Hall ^ is inclined to consider this species 

 as congeneric vjii\\ JEmnetria vera (Hall) from the Kaskasia Limestone 

 of the Lower Carboniferous Series of America. But until we know 

 the internal structure of the species, we cannot positively decide to 

 what genus it should be assigned. Waagen ^ has suggested that it 

 may belong to his genus TJncinella, from the Productus Beds of the 

 Salt Range of India, In the description of Eeizia ? carbonaria (Dav.) 

 from the Lower Carboniferous Shales of Skrinkle, Pembrokeshire, 

 Davidson ^ mentions Terebratula serpenlinu, but Betzia ? carbonaria is 

 held by Hall* to belong to the distinct genus Ilustedia. 



YI. — Note on a laroe Bqulber at Wimpolb Hall, Cambs. 

 By F. E. CowPER Ebed, M.A., F.G.S. 



ABOUT five-and-twenty years ago a large boulder, lying in the 

 garden of Wimpole Hall, near Eoyston, w^as pointed out to the 

 Rev. Osmond Fisher by the Lady Hardwicke of that period, and 

 i-he informed him that it had been brought from near Old North 

 Road Station w^hen the hill there was lowered. As its dimensions 

 and nature had not been determined, Mr. Fisher invited me to 

 accompany him to Wimpole on April 22nd in order to examine it, 

 having previously obtained permission from the present owner of 

 the property. Lord Robartes. After a brief search the boulder was 

 discovered lying about 30 yards north-west of the conservatory 

 and almost concealed under a dense growth of ivy. It measures 

 approximately 8 ft. 10 in. in length, 4tt. in height, and 1ft. Sin. in 

 breadth, and consists of a greenish-grey tough sandstone. Mr. Fisher 

 determined its S.G. to be 1'91 and its weight to amount to 3 tons 2cwt. 

 Lithologically the rock is precisely similar to portions of the Spilsby 

 Sandstone of Lincolnshire, and a specimen in the Woodwardian 

 Museum from near Claxby is indistinguishable from it. By good 

 luck a small Ammonite occurred in a fragment chipped off by the 

 Rev. E. Couybeare, who met us at Wimpole; and Mr. G. C. Crick, 

 of the British Museum, who has kindly examined it for us, writes 

 that it is " not referable to any species which has hitherto been 

 recorded from Great Britain," but that it " is closely related to 

 Olcostephanus (Craspedites) svbditus (Trautschold), which has been 

 recorded from the Spilsby Sandstone of Lincolnshire (Pavlow and 

 Lamplugh, ' Argiles de Speeton,' etc., p. 116, pi. xiii (vi), 

 figs. 5a, b, c)." 



The occurrence of many boulders in the Cambridgeshire Boulder- 

 clay from northern sources has been noticed by many observers, and 

 possibly some of the sandstones which are frequently found in it 

 may come from the Lower Greensand beds of Lincolnshire, but, 

 as far as I am aware, no block of such a size from these beds, 

 bearing such a definite proof of its origin, has ever before been 



1 "Palfeont. New York," vol. viii, Brachiopoda, ii (1894), pp. 118, 119, pi. 11. 



* " Palseout. IncL," ser. xiii, Salt Rauo-e Fossils, vol. i (18813), p. 495. 

 3 "Brit. Foss. Brach.," vol. ii, p. 219," pi. 11, fig. 3. 



* Op. cit., p. 122. 



