376 Marine Bands in the Yorkshire Coal Measures. 



nition in the exploration of the concealed Coalfield in south-east 

 Yorkshire, As seen at Brodsworth and Bentley, it is 15 to 16^ 

 ieet thick. At the top it consists of blue shales marked with 

 fucoids, and having a soapy feeling. Similar shales below these 

 are crowded with Lingula mytiloides. Beneath these are 

 greyish-blue, hard shales, which in turn rest on a hard greyish- 

 blue limestone. The lower shales are very fossiliferous, and 

 the limestone moderately so. The fossils obtained include five 

 species of brachiopods, sixteen species of lamellibranchs, three 

 species of gasteropods, thirteen species of cephalopods, and a 

 crustacean. Among the fish remains is Listracanthtis wardi. 



Marine fossils have also been found recently in four clay pits 

 in the Yorkshire Coal Measures. The relation of these places 

 to one another in the geological sequence has not yet been 

 worked out, but they are mentioned with a view to stimulate 

 investigation elsewhere. One of them is at Darfield, eight miles 

 north of Rotherham. It contains a limestone with Goniatites. 

 At Walton, two miles south-east of Wakefield, there is a lime- 

 stone with Posidoniella and Syncyclonema. At Nostell, five 

 miles south-east of Wakefield, the marine band below the 

 Ackworth Rock may be seen. At Castleford is a section with 

 greyish-blue shales containing Lingula. The accompanying 

 photograph shows the marine band in the Nostell clay pit. 

 The hammer-head is resting on the Pterinopecten bed. 



-♦♦- 



CRUSTACEA. 

 Platyarthrus hoffmannseggii near Scarborough. — Re- 

 ferring to the note on Platyarthrus hoffmannseggii on page 176 

 of the April 'Naturalist,' I should like to add that whilst 

 engaged in taking cinematograph films of the Wood Ant at 

 Barnscliffe near Scarborough, with Mr. F. Martin Duncan, on. 

 July 29th, 1910, we found two of these Isopods in one nest ; 

 and I quite agree with Mr. Stainforth's remarks that if in- 

 vestigations were pressed forward, we should most probably 

 find it is generally distributed in various districts. — Harry 

 Witty, 30 Nansen Street, Scarborough. 



We regret to learn of the death during- the past few days of Mr. J. R. 

 Dakyns, formerly of H.M. Geological Survey, Mr. Dakyns was well known 

 to Yorkshire geologists, and is responsible for many maps and memoirs 

 bearing upon the county. He had passed his three score years and ten 

 some time ago. 



, Naturalist, 



