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Habit : runs with great agility, does not roll. 



Habitat : very local ; dry places, as old ruins, under dry leaves. 



Localities : Ireland — Dublin (local), Belfast (A. H. Hdliday, Esq.) 

 England — Chisselhurst, Kent, among chalk-pits ; now first added to 

 British lists. 



4. — P. I(2vt8 (Lam.), 



Body very convex, polished ; lateral frontal lobes slightly salient, 

 small, rounded; median lobe triangular, very short; last ring, apex 

 rounded, deeply sulcate above. The largest of our species. 



Colour : lead-gray, occasionally blotched with yellow on sides. 



Habits: semi-rolls, sluggish. 



Habitat : common everywhere in moist places, especially in stables 

 and litter, among grass at bottom of walls. 



Localities: Ireland — Dublin. England — Kent (one specimen in 

 British Museum Collection, from neighbourhood of London). 



5. — P, prutno8U8 (Brandt, Conspect. 19.) 



Synonyms: Porcellio frontalis (Zerehoullet), preoccupied by Ed- 

 wards. P. maculicomis (?) (//. Schceffer). 



Body sub-ovate, oblong, slightly rugged, downy. Lateral lobes 

 small, roimded. Median lobe rounded, minute, almost linear ; last ring 

 triangular, acute at apex ; surface plane. Feet very long. Abdomen 

 much narrower than cephalo-thoracic rings. 



Colour : uniform mouse-colour, marbled under the lens with white. 



Habit : runs with great agility, concealing itself rapidly from the 

 light ; preferring moderately humid, warm situations ; one of the com- 

 monest of our species. It buries itself to a considerable depth in clay. 



Locality : Ireland — Dublin ; everywhere. England — Kent, Chis- 

 selhurst, very common. (Three specimens (unnamed) in British Museum 

 Collection, from neighbourhood of London, belong, I believe, to this 

 species. They are stuck on cards, rendering examination impossible.) 

 Now first added to British lists. 



6. — P. armadilloides {Zerehoullet). 



SynonjTUs : 0. eonvexus {Begeer), 0. saxatilis (Hartmann). 



Body elongated, elliptical ; segments very convex, smooth. Lateral 

 lobes minute, truncated in front. Median lobe very short, angular, 

 acute. Last ring of abdomen acute, plane, or slightly convex above. 



Colour : iron-gray, with clear borders to segments ; a band of white 

 blotches along either side of the median line. Never having seen it 

 alive, cannot speak of its habits. Rolls itself into a perfect balL 



Added to British lists on authority of six specimens in British Mu- 

 seum Collection (unnamed), which A. White, Esq., informs me were 

 captured near London (Highgate) (?) by Mr. Walker. 



