226 On a new Species of Aimadillidium. 



Mouth-parts as in A, vulgare. Colour', general surface 

 varying from slate-blue to dark brown. A continuous 

 narrow light band runs down the middle of every somite, 

 but not on the head or '' telson." The coxal plates are 

 light with narrow, dark, posterior margin. Between coxal 

 plates and median line the dark areas of each somite are 

 broken up with light mottling. 



Remarks. — This species is distinguished from A. nasatum, 

 B. L. (with which it was formerly confused), by the following 



Fio-. 4. 



Armadillidiuvi speyerij first three thoracic somites, from the side. 



characters. The epistomal shield, although very prominent, 

 is not so pronounced ; the front of the head is much more 

 deeply notched in the median line; the hind edge of the first 

 thoracic somite is not deeply notched on each side of the 

 posterior edge; the '' telson''^ is not narrow and pointed, but 

 widely rounded at the apex ; the external plate of the uropod 

 is rectangular and not spatulate, and the segments of the 

 flagellum are markedly unequal. That it has been confused 



Fio-. 5. 



Armadillidiu7n nasaimn, first three thoracic somites, from the side. 



with A. nasatum in the past is shown by an examination of 

 Budde-Lund^s copious material in the British Museum, 

 Natural History. A large collection from S.W. France, 

 labelled A. nasatum, could easily be divided into two 

 portions comprising the true A. nasatum and the present 

 species. It is suggested that A. speyeri is a species of a 

 warm climate that has been imported into England some 

 time in the pat^t, and has only found it possible to exist 



