48 



species ; ami Stagobius (n. g., so peculiar in its structure that it is unlike any 

 other of the Silphidae, and minutely described). 



A Thysanoura, Anurophorus Stillicidii, on clusters of Byssus fulvus. 



Two remarkable blind Arachnidse, each the type of a new genus, viz., Stalcta, and 

 another not named. 



A Crustacean of the family Amphipodes, Niphargus (new genus). 



The term, subterranean Fauna, may with propriety be applied collectively to those 

 animals which exclusively inhabit caves, and are expressly constructed for such locali- 

 ties. They may with tolerable precision be arranged under the following heads : 



Shade-animals ; extensive genera and species, inhabiting caverns near their en- 

 trance, and generally all cool, shady and moist localities. 



Twilight-animals ; they belong to widely spread genera, but are peculiar to the 

 caves, and distinguished by their small eyes. They are principally found 

 near the entrances to the caves, but proceed deeper into the darkness than the 

 shade-animals. 



Cave-animals ; they form, at least in part, peculiar genera ; are wingless and co- 

 lourless, and exist exclusively in total darkness. The terrestrial division is 

 blind ; the aquatic has a perception of light. 



Stalactite Cave-animals ; Insects, Arachnidae and Crustacea, appertaining to pe- 

 culiar genera ; wingless, blind, living in total darkness, peculiar to stalactite 

 caves ; in part occupying the columns, and constructed accordingly. 



The following papers were also read : 



' Descriptions of Six New British Diptera,' by F. Walker, Esq. 

 ' On the Genus Acanthosoma,' by W. S. Dallas, Esq. 



' On the British Species of the Genus Gelechia' (Fifth Part), by J. VV. Douglas, 

 Esq. 



' On the Genus Gracilaria,' by H. T. Stainton, Esq. 



The President appointed Messrs. J. F. Stephens, W. W. Saunders, W. S. Dallas, 

 S. J. Wilkinson, E. Shepherd and F. Smith, auditors of the Treasurer's accounts, and 

 gave notice that the Anniversary Meeting would be held on the 27th January. 



