Myriapoda from Derbyshire. ■ 331 



A form intermediate in organization between TAthohius and 

 GeopJtilus. 



A few, Bakewell district, ourselves, 1918. 



Family Gsophilidae, Leach, 1814. 

 Genus GeophiluS, Leach, 1814. 



25. G. carpophagu*, Leaclt. 



Syn. G. sodalis, Bergsoe et Meinert. 



G. condy toy aster, Latzel, 1880. 



41 mm. 



This is a dark brown species of our well-distributed genus 

 Geophihis. The pegs of the anterior ventral plates are 

 prominent and the corresponding sockets comparatively 

 small. We have not ourselves met with this species in the 

 county. 



♦Dove Dale, R. S., 21/iv./14 («/.)• 



2 (?. G. longicomis, Leach, 1814. 



Syn G. flams (De Geer, 1778). 



40 mm. 



A detailed examination of examples of this species will 

 show that the true peg-and-socket or " carpophagous " struc- 

 ture is wanting in the ventral plates of the animal's body. 

 This character is present in all its known English congeners. 



*2 ? ? , Oastleton, R. S., ix./13 {J.), G. 3135 ; near the 

 R. Dove, ourselves, ix./16 ; 1 ? with forty-seven pairs of 

 legs, Manners Wood, near Bakewell, W. B. & S. G. B.-B., 

 6/vi./18 ; Bakewell district, ourselves, 1918. 



27. G. insculptuSf Attems, 1895. 



Syn. The name " G. provimus " has been used by other authors in 

 this country and ourselves to record animals which un- 

 doubtedly belong to G. insculptus. The true G. proximo*, 

 C. L. Koch, 1847, is unknown to us. 



25 mm. 



In May and June we found G. insculptus to be a fairly 

 common species, and we obtained a good number of specimens. 

 The socket of the anterior ventral plates is large. 



Buxton and Bakewell districts, ourselves, 1918 ; Burba»e 

 Hall, S. G. B.-B., 27/v./18. 



28. G. electricus (Linne, 1758). 

 45 mm. 



This is an interesting species, not very common in the 



