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7. — P. cingmdua (». «.) (mihi). Plate XIX., Fig. 1. 



Body elongate, ovate, smooth, or slightly scabrous. Lateral lobes 

 minute, rounded, directed downwards. Median lobe nearly obsolete, 

 arcuate. Terminal ring broadly triangular ; apex acute, plane above ; 

 a raised continuous line along upper margin of each ring. "Whole ani- 

 mal shining, smooth, or covered with minute shining granulations only. 

 Closely alUcd to P. pruinosus, from which it differs chiefly in the 

 smooth, shining body, and the coxse of cephalo- thoracic rings having 

 their posterior angles rounded off. 



Colour : bright red and yellow blotches on a dark steel-gray ground. 



Habits : runs with extreme rapidity ; inhabits dry stations exclu- 

 sively, as under leaves ; never rolls itself into a ball. 



Localities : Dublin, very rare. 



The characters given above are constant, easily distinguishing it 

 from P. pruinosus, which, when young, resemble the parents. I can find 

 no description in authors approaching this species, and am, therefore, 

 compelled to give it a name. I find it both in company with P. prui- 

 nosus, and also alone. 



Family.— LIGID^. 



Genus. — Ligia. 



1. — Ligia oceanica {Lin. sp.) 



Synonyms : Oniscus oceanicus {Linn.), P. a^uatieus {Baxter), Cymo- 

 thoa oceanica {Fabric), Ligia oceanica {ib.). 



Body flattened, oval. Head transverse, covered with smooth gra- 

 nulations. External antennae shorter than body. Tige multi-articulate, 

 sub-glabrous. Terminal ring of abdomen : posterior border regularly 

 arcuated in the middle. Coxas as acute angles. Abdominal false feet : 

 peduncle oblong, slightly shorter than last abdominal ring. Ischium 

 and accessory appendage twice the length of peduncle. 



Colour : yellowish-brown, the j- oung prettily diced with white. 



Habits : runs with agility, or rolls up extremities of body, and feigns 

 death ; very common among vegetable debris, along tide-marks, and on 

 rocks ; seldom takes water ; may be seen running over sand in full sun- 

 shine. 



Common around Ireland. 



Family.— PHILOSCIAD^. 



Genus. — Philoscia {LatreiUe). 



I. — Philoscia muscorum {LatreiUe). Plate XX., Fig. 1. 



Synonyms : Ligia melanocephala {JI. Scha^ffer), Oniscus sylvestris (?) 

 {Fabric), Oniscus muscorum (?) {Cuv.). I have not been able to 

 verify the reference queried. Philoscia muscorum {Zaddacic, Syn. Cnist. 

 Prussic, p. 14). 



