WEBB : THE BRITISH SPECIES OF TESTACELLA. 75 



year ; in it Mr. J. \V. Taylor described the external 

 characters of the two less easily distinguished species 

 and the points of difference in the anatomy of their 

 reproductive organs made out by Mr. Ashford^ together 

 with others in the radulae. To the paper was added an 

 exhaustive account of the distribution of Testacella scutulum 

 in the British Isles and elsewhere. 

 1893. ^^ J^i'^6 ist the present writer made some remarks 

 before the Linnean Society* on the manner of feeding in 

 Testacella scutulum, and gave the results of some anatomical 

 work on this species which bore out Mr. Ashford's state- 

 ments. 



In the Annals and Magazine of Natural History for 

 July, Mr, Walter E. Collingef also confirmed Mr. Ash- 

 ford's results, giving an exhaustive account and figures 

 of the reproductive organs of all three species. 

 In his paper, Mr. Taylor expressed the hope that the full 

 distribution of T. scutulum would be worked out, but, as the 

 writer has already indicated,]: by the separation of this species 

 a doubt must be thrown upon the existing records for T. haliotidca, 

 and the most important piece of work on the distribution of these 

 slugs, is the obtaining of a reliable list of localities for the latter 

 species, like the one given for the other form by Mr. Taylor. 



With this end in view, the writer has been endeavouring, 

 with the welcome help of the gardening and other papers, § to 

 obtain specimens of Testacella for careful determination. Up to 

 the present, the effort has been productive rather of a number of 

 individuals than of localities ; but the abundance of material 

 which has been collected, through the kindness of correspondents 

 throughout Great Britain, has given to the writer the oppor- 

 tunity of doing some work that might have been undertaken 

 when his observations were made on Testacella scutulum, but 

 which had perforce to stand over on account of the difficulty 

 then, and till now, experienced of obtaining T. haliotidea. 



In the following papers the British species of Testacella 

 will be briefly compared externally and anatomically, and 

 later, the distribution will be dealt with, moi'e particularly 

 that of T. haliotidea. 



* Proc. Linn. Soc, 1892-3, p. 28. A paper embodying tlie remarks alluded to was 

 published in the Zoologist, ser. 3, vol. xvii. (August, 18:^3), pp. 281-289, pl- i- 



t Ser. 6, vol. xii., pp. 21-25, pl- '• 



X Nature, July 26, 1894. 



J Gardeners' Chronicle, 1895. Gardening World, vol. xii., 1895, p. 89. Nature, vol. lii. 

 P- 597- 



