PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 47 



The unimportance of certain characters formerly relied upon 

 for determination of species was pointed out. Such characters 

 are : accessory cusps on any of the unci ; length of external 

 cones ; length of base supporting uncus ; number of true 

 externals ; elongation of radula. 



In the above-mentioned species the radula is in each 

 case characteristic ; though the determination is more difficult 

 in the pairs of species Limax maximus and L. cinereo-niger , 

 Agriolimax agrestis and A. Icevis, Milax sowerhyi and 

 M. gagates. In these cases, however, it is believed that the 

 distinguishing characters given, derived from careful and con- 

 tinued examination of a large number of specimens, will hold 

 good. But the point of view is adopted that the use of radula 

 study is to establish relationship rather than distinctions. 

 The paper was illustrated by a series of eighty-eight photo- 

 graphs. 



2. " On the Hectocotylus of Todaropsis." By R. Winkworth, 

 F.R.G.S. 



While in Plymouth last January the author was fortunate in 

 procuring a male and female of Todaropsis ehlance, Ball, the 

 " Newfoundland sleeve " of Channel fishermen. Since no 

 hectocotylus of the Oigopsida has previously been noted in 

 English works, it is worth recording that the fourth right 

 arm is modified throughout its whole length, the suckers being 

 replaced by papillae, which are large and alternate on the 

 basal part and form a linear series along the distal two-thirds 

 of the arm. The fourth left arm is also modified, but for the 

 proximal third only. Drawings and specimen were exhibited. 



3. " Concerning Edenttellina." By Chas. Hedley, F.L.S. 



On the motion of Mr. Kennard, seconded by Mr. Tomlin, a 

 unanimous vote of congratulation to Mr. R. Bullen Newton (who is 

 retiring from the staS of the British Museum) on his completion 

 of fifty-two years' association with geological science was passed. 



An obituary notice of the late R. Etheridge, jun., was read by 

 Mr. R. Bullen Newton. The announcement of Mr. Etheridge's 

 death was received with regret by the Society. 



ORDINARY MEETING. 

 Friday, 14th May, 1920. 

 G. K. GuDE, F.Z.S., President, in the Chair. 

 The following communications were read : — 



1. " Nomenclatorial Notes relating to British Non-Marine 

 MoUusca." By A. S. Kennard, F.G.S., and B. B. Woodward, 

 F.L.S., etc. 



2. " New MoUusca from Port Alfred." By G. B. Sowerby, F.L.S. 



3. " On the Anatomy of two species of Helicarion from Tropical 

 Africa." By Hugh Watson, M.A. 



