DUBLIN VATUBAL HISTOET 80CIETT. Ill 



2. — Philoicia Couchiif n. s, • 

 Corpore laeve, splendido. Fronte recto. Telsbn lineare-triangulari ; 

 apice obtuse-truncato, setis validis armato ; lateribus paululum excava- 

 tis. Pleopodis postcrioribus ; Ischio falciformi-subulato. Appcndice 

 vix J ischii longitudinem aequante. 



Sub lapidibus algisque marcescentibus ad maris marginem ad " Tal- 

 land Cove," juxta Polperro, Cornwall, Angliam haec species a me re- 

 perta fuit. Viro clarissimo Jonathan Couch, F. L. S., qui de animalibuB 

 murinis regionis Comubicnsis cognoscendis optime meruit, dicatam esse 

 velim. 



PHILOSCIA. 



Body flattened ; no lateral or median lobes to carapace ; internal 

 antennae three-jointed. Peduncle of external antenna rounded, unlobt^d. 

 Tige three-jointed. Posterior pleopods (last pair of false feet) attached 

 to exterior margin of telson, uncovered. Peduncle (basis) quadrilateral. 

 Ischium trigonal, and, as well as accessory appendage, imcovered. 



Species 1. — Philoscia muscorum {Latreille), 



Body smooth and shining; head transversely elliptical, arched in £ront; 

 no true lateral or median lobes ; internal antennae inconspicuous ; ex- 

 ternal antennae densely hairy ; abdomen much narrower than cephalo- 

 thorax; telson (last ring) broadly triangular; apex acute; posterior 

 pleopods (abJbminal false feet) ; Ischium trigonal, spinous along edges. 

 Accessory appendages more than half length of ischium, and nearly at- 

 taining to its summit. 



Colour : fulvous, with dark black patches and white blotches. A 

 pale salmon-coloured variety is not uncommon. Habitat : dry places, 

 under leaves, stones, moss ; also near sea-shore very common. 



. Habits : runs rapidly ; seeks sunshine ; does not roll into a ball ; 

 feigns death. 



Localities : Dublin, "Wicklow, Meath, Wexford, Cork, Waterford, 

 Tyrone, and probably all over Ireland. England — Middlesex, Essex, 

 Kent, Plymouth, Devonshire not so common, Cornwall, Polperro, &c. 



Species 2. — Philoscta Couchii (Mthi) n. *. Plate XXIII., Fig. 4. 



Body smooth, elliptical ; head somewhat rounded, nearly straight 

 across front ; beneath orbits a small lobe, arising from superior margin 

 of antennal ring. Internal antennae inconspicuous ; external antcnnaD 

 hairy ; tige long and narrow. Abdomen narrower than cephalo- thorax. 

 Telson (last ring) narrow, linearly triangular ; apex rounded, and fringed 

 with stiff bristles ; sides excavate. Posterior pleopods (last pair abdo- 

 minal feet) ; ischium elongate, fidciform, subulate. Accessory appendage 

 scarcely one-fourth the length of ischium ; in other lespeota tts FkiUncut 

 muscorum. 



Colour : lead gray, uniform to the naked eye. 



Habitat: under stones, and amid dccajring seaweed at high-water 

 mark; local. 



B 



