THE DECAPOD CRUSTACEA. 



193 



4. Fam. Paguridne.^ n , ,. -, - fin Eupagurus bernhardus the 

 Abdomer! long Chelipeds of un- ohelipeda bear S p inou s tu- 

 ,,] __r>i. _I-~T ii equal size, tne i i *_ 



and soft, shel- 

 tered within 

 Mollusc shell . 



-Eupagurus 



bercles. 

 i E. prideauxii they are less 

 tuberculated. 



^ m ;^ odi t ; | Rostrum long, last^ 



turned but in- 1 pair of le s ^~ l nly British species, LithocUs 

 completely cal- 

 cified 



mentary Li- j 

 thodes , . J 



Fam.Corystid*. fCarapace ovate- C 

 Antenna/ longJ Cor y stcs ' *\ 



ritish 



' Cor y. stss _ 

 masked 



and hairy 



. I Carapace circular /Only British species, A. 

 v Atelecydus .\ heterodon. 



NOTE ON DISTRIBUTION. 



There is much that is interesting in regard to the distribution of 

 the Crustacea mentioned in this chapter. While the common lobster 

 occurs everywhere in suitable localities, the rock lobster (Palinurus) 

 only occurs on the South and West, and is most abundant in the 

 South. On the other hand, the Norway lobster, so abundant off the 

 East Coast of Scotland, is rare in the South and South-west of England. 

 On the East Coast, e.g. at St. Andrews, the scaly Galathea (#. 

 squamifera) is the only species of Galathea found between tide-marks ; 

 at places like Ilfracombe and Torquay G. strigosa and other species are 

 to be found there. The porcelain-crabs seem to occur wherever the 

 conditions are favourable. Of the hermit-crabs the common one 

 occurs everywhere, while E. prideauxii is confined to the South and 

 West, where, however, it does not occur between tide-marks. The 

 northern stone-crab (Lithodes) is confined to the Northern parts of 

 our area, and is especially abundant off Aberdeen, where it reaches a 

 great size. The masked crab and its ally Atelecydus occur at most 

 parts of the coast where the conditions are favourable. 



