552 



Color biepius fuscescens aut rulb-bruiineus ; pedibus pal- 

 lidis. 



Sp. 3. Obisium }?iarkh?imn. 



C. pedibus secundis articulo 2 cyliiidraceo, 3 ovato ; basi 



atlenuato, 4 ovato ; digitis brevibus subcurvatis. 

 Long. Corp. 2 — 9,^ lin. 



Habitat in Anglia occidentali inter rupes ad littora maris. 

 Communioavit Dom. C. Prideaux. 



Color livido-fuscLis, pedibus 4 anticis pallide ferrugineis ; 



8 posticis pallidis. 

 Thorax antice nonnunquam ferrugineus. 



Sth^ps 2. 



The nervous system of the animals composing this stirps 

 consists of eight ganglia, brought into communication by 

 two nervous cords, which are generally confluent between 

 the hindermost ganglia. The first ganglion is situated be- 

 hind and above the origin of the first pair of legs ; it is 

 larger than the others, and its hemispheres are well defined; 

 it receives the optic nerves as well as nerves from the di- 

 rection of the first branchia3 : the three following gan- 

 glia are abdominal, and distinctly receive nerves from the 

 branchial regions: the other four ganglia are placed within 

 the four first joints of the tail ; and the last receives nerves 

 from the terminal joint which bears the sting. 



In the specimens that I have examined (taken out of al- 

 cohol), not the slightest traces of the nerves arising from 

 the viscera and joining the abdominal ganglia as described 

 by Treviranus * and Dufour f could be discovered. 



* Heber den innern Bau der Arachniden. 

 f Journal de Physique, 1817, p. 439. 



