Oit Home little-hnown British S/u'dtrs. IQ'.] 



KXl'LAXATION OF ri.ATI-: IX. 



Fiffii. 1, 1 rt, 1 /*. Choanomphalns jiipu/iicus persfridtidus, subsp. n., X 8. 



Fiff. 1 c. Sculpture of same, X l''>. 



Fiffs. 2, "2(1, '2 b. Choanomphalia /uponicus, sp. n., X 0. 



Fiff. 2 c. Sculpture of ^aine, X 9. 



Hffs. .■{, 3 (f, '-ib. Planorbis ((iiirwilus) biwacnsis, sp. n., X 4. 



Fig.ic. Sculpture of same, x S. 



Fig, 4. Vnlcata hiicncnsis, sp. n., X 4. 



Fig. 4 a. Sculpture of same, X '"^. 



Figs. '), n a. J'alrnta annroidalei, sp. n., X 4. 



Fig. 5 b. Sculpture of same, X 8. 



Figa.6, 6 a. Lithotis japonica, sp. u., X (>. 



XT. — ()/* the Xomenclatnre and Id'-ntity of some Uttle-hnoioa 

 British Spiders. By A. Randell Jackson, M.D., D.Sc. 



During the Inst two years the Rev. 0. Pickard-Canibridge 

 has kindly aUowed me to examine the actual types of a 

 number of little-known British spiders. For the most part 

 these were descril)ed many years ago, when microscopes 

 wore new or little-known instruments. JMany of these 

 spiders had never been recorded since ; but there was no 

 doubt that several of tiiem had been redescribed under other 

 names when the use of microscopes became more general . 



I here publish the result of these investigations as far as I 

 have gone. I had hoped to hive examined all the species on 

 the British list which were unknown tome, but circumstances 

 will not now permit this. I hope, however, to finish this 

 investigation at some future date. 



For half a century Mr. Pickard-Oambridge has laboured 

 in the field of arachnology, and iiis collection contains nearly 

 all the species hitherto recorded as British. Hence tiie great 

 kindness he lias shown nie in allowing me to examine these 

 types has put me in possession of many facts otherwise 

 inaccessible. I here thank him for this and for all the 

 innumerable other kindnesses he has done me. 



In my previous papers on the genera Microneta and Por^ 

 rhomma I accounted for many of these haU-forgotten species. 

 1 here continue the work, and have now, save lor about a 

 dozen s])ecies, finished the great laniily Argiopida3, which 

 contains considerably more than half of the British spider- 

 fauna. 



I may .^ay that I have not gone into any ancient questions 

 of nomiMiclature, but have started from the basis of 

 Mr. Piekard-Cambi idge's ' List of British and Irish Spiders,' 

 published in lOOO. 



