Notes and Comments. 67 



plates and illustrations in the text, which are of particular 

 interest to readers of the ' Naturalist ' from the fact that most 

 of the specimens fig-ured have been taken in Cheshire. We 

 are kindly permitted to reproduce one of the illustrations 

 herewith, representing- a new variety, better representations 

 of which occur on one of the plates. 



RARE DIATOMS. 



It is pleasing- to find that the Hull Microscopists are not 

 resting- on their oars, since the appearance of Mills' and 

 Philip's excellent illustrated monograph on ' The Diatomaceae 

 of the Hull District' was issued in 1901. Notwithstanding- 

 the fact that the work contained particulars and illustrations 

 of no fewer than 600 species and varieties, the list is added to 

 annuall)'. In the transactions of the Hull Scientific and Field 

 Naturalists' Club for 1905, Mr. R. H. Philip gives particulars 

 of the additional forms recently found. These are figured on 

 a plate, which we are permitted to reproduce (plate III.). 

 The specimens figured are from Spurn, Cleethorpes, &c. In 

 the order on the plate, they are I. Synedra barbatula, II. Navicula 

 apis, III. N. exilissima, IV. .V. seminiilum, V. N. vtdpifia, VI. 

 Plagiotropis gibhenda, VII. Amphora tutgida, VIII. A. acu- 

 tiusciila, IX. Nitsschia socialis, X. N. punctata var. coarctata, 

 XI. Pleiirosigma obsciiruni, XII. Achnanthes Danica, XIII. 

 Hantzschia amphioxys var. vivax. 



PERMIAN P^OOTPRINTS IN NOTTINGHAMSHIRE. 



At a recent meeting of the London Geological Society, 

 Prof. W. Boyd Dawkins communicated a paper by Mr George 

 Hickling, which was of particular interest from the fact that 

 '■ No footprints had previously been found in the undoubted 

 Permian of this country.' The fossils were discovered in the 

 Rock Valley Quarry, Mansfield, in a local lenticular mass of 

 sandstone intercalated in the Magnesian Limestone. The im- 

 pressions formed two double rows, approximately parallel, and 

 seven and two feet long respectively. Nearly the whole of the 

 longer series is in the Nottingham Museum, and part of the 

 shorter series is in the Manchester Museum. Both sets were 

 made by the same species of animal, the stride in one case being 

 eight, and in the other case eight and three quarter inches. 

 The prints show a well marked heel and comparatively slender 



J906 March i. 



