194 
PROCEEDINGS OF SOCIETIES. 
Professor Kinahan, M. D., read a paper— 
ON THE GENERA PHILOSCIA (LATREILLE) ; ITEA (KOCH) ; PHILOT7GRIA (kINA- 
HAn) ; COMPRISING DESCRIPTIONS OF NEW BRITISH SPECIES. 
(WITH A PLATE.) 
In an “ Analysis of the British Oniscoidea” read before Section D of the 
British Association, at their recent Meeting in this city, and afterwards 
published in your Transactions, reasons were given for re-establishing 
the genus Philoscia (.Latreille ), which M. Edwards, Dana, and others, 
are inclined to incorporate with the genus Oniscus. As first de¬ 
scribed, the genus included hut one species, the Oniscus muscorum 
(, Scopoli ), Oniscus sylvestris (Fabricius ). To-night I have to announce 
another species of the genus, which confirms me in the propriety of the 
establishment of this genus, as it agrees with Phil, muscorum in all those 
characters which led to the generic separation of that species from 
Oniscus. 
The genus Philoscia, though established by Latreille, appears to have 
been unknown to all the German authors who have written on the group, 
with the exception of Zaddach, who gives a very fair description of it. 
H. Schaeffer states :—“ Philoscia: Up to this, hut one figured species 
is known, namely, 0. muscorum (Scopoli). Whether the species 0. syl¬ 
vestris here cited is properly referred here may he questioned; to me 
the genus and species is unknown.” Milne Edwards contents himself 
with copying Leach’s description of the species; while Lereboullet 
evidently has never seen the typical species, as he describes a well- 
marked species of Oniscus for it. This is singular, as the animal is one 
of the commonest of the group in Ireland and England, and, Zaddach 
states, also common in some parts of Germany. 
The genus Philoscia and its relations were so fully discussed in my 
former paper, that it is unnecessary here to do more than briefly describe 
the species and genus. 
Family.—PHILOSCIDZE. 
Genus 1 .— Philoscia (Latreille). 
Telson (cingulumultimum) coxisperparvulis. Pleopoda (pedes spurii) 
posteriora nuda, ad telson marginem exteriorem articulata, basis quadri- 
lateralis; Ischium trigonum, satis appendiculatum, nudum, lobus acces¬ 
sorius triangularis. Antennae internae 3-articulatae. Antenn. extern, 
basis rotundatus, non lobatus; filamentum 3-articulatum. Abdominis 
cingulum coxae parvae. Carapacis frons nec mediane nec lateraliter 
lobatus. 
1 .—Philoscia muscorum (Latreille). 
Corpore laeve, nitido, splendido. Eronte paululum medio arcuato. 
Telson late-triangulari, apice acuminato, lateribus rectis. Pleopodis 
posterioribus; IscJiio, falciform!; Appendice ischii dimidio longitudinem 
vix superante. 
Sub musco lapidibusque ubique abundantissime, etiam ad littus ma- 
rinum. 
