6 Notes and ComtJients. 



position after nine years as Hon. Secretary, though he retains 

 his editorial duties in connection with ' The NaturaUst ' and 

 the Union's Transactions. In future, the secretarial work 

 will be carried on by Dr. T. W. Woodhead and Mr. W. E. L. 

 Wattam of Huddersfield. Mr. J. W. Taylor, the well-known 

 malacologist, occupies the presidential chair during igi2. 



VALUABLE YORKSHIRE MAPS. 



It is well known that the late J. R. Mortimer, the Driffield 

 Antiquary, was an authority on the prehistoric and other 

 earthworks of East Yorkshire, and during the past half century 

 has made a careful survey of all that remains relating to the 

 military and domestic life of these early people, a subject upon 

 which he has written many important papers. Several of the 

 structures which were, known to Mr. Mortimer forty or fifty years 

 ago, or less, have since entirely disappeared, as a result of 

 agricultural and other operations. Fortunately Mr. Mortimer 

 carefully recorded his observations upon a large series of 

 ordnance maps of the district, and also particulars of the 

 barrows, the Roman remains, the pits from which he obtained 

 his geological specimens (most of which are now closed), etc. 

 This valuable collection of maps has been generously presented 

 by Major Mortimer to the Municipal Museum, at Hull, where 

 it can be referred to by students and others interested. In 

 addition are large numbers of sketches, plans, photographs, 

 negatives, etc., bearing upon East Yorkshire Antiquities. 



UROCYCLUS ROEBUCKL 



If proof were needed of the influence of the work of York- 

 shire Naturalists far beyond our own shores, it is found in the 

 quite spontaneous honour which Dr. H. Simroth, the greatest 

 continental authority on slugs, has sought to confer upon 

 Mr. W. Denison Roebuck, in h's ' Lissopode Nacktschnecken von 

 Madgaskar den Comoren und Mauritius ' a reprint from ' Voeltz- 

 kow's Reise in Ostafrika in den Jahren, 1903-1905, band 2,' 

 published in 1910. During this expedition a large and con- 

 spicuous slug was discovered in the island of Pemba, off the 

 coast of British East Africa, which has been described in the 

 above work by Dr. Simroth, on pp. 595-596, and is illustrated 

 by a coloured plate and text figure. To this new species he 

 has given the name of Urocyclits roehucki Simroth, and says, 

 ' I name this species in honour of Mr. Roebuck for the great 

 services he has rendered to the study of slugs.' For thirty 

 years Mr. Roebuck has been at work on this subject, and our 

 knowledge of the occurrence and distribution of at least a 

 third of the British species is due to him. No one knows the 

 British slugs better, nor has a more intimate and practical 

 knowledge of their distribution. 



Naturalist,. 



