ISOPODA. 
403 
Genus Porcellio. 
P. scaber , Latr. 
“ Common under stones, wood, and in old walls.” Templeton MSS. 
P. Icevis, Latr. 
“ Rare ; I have only seen one specimen.” Templeton. 
Genus Armadillium. 
A. vulgare, Edw. 
J. V. Thompson, catalogue. “ Inhabits among stones and moss.” 
Templeton. 
Genus Praniza. 
P. ccerulata, Mont, (sp.) ? 
A letter from A. H. Haliday, Esq., dated October 9th, 1847, conveyed 
the following information : — “ I found a species of Praniza pretty com- 
mon on the clayey shores of Strangford Lough last week, in company 
with Anceus maxillaris. They were in small cavities on the surface of the 
clay under stones, sometimes singly, oftener two or even three and four in 
each hole ; the smaller slender green ones were few in comparison. You 
will find some of the new-born young with them, having all the charac- 
teristic form of the parent, but the posterior thoracic segments not so 
completely confounded together. I have given but a hasty look at them, 
but have not recognised males among the adults.” 
Along with Crustacea since received from Dr. Ball, were sent spe- 
cimens of a Praniza , purchased of Mr. M‘Calla as collected on the Irish 
coast, but no locality is given. They were obtained previous to those 
first noticed. 
M. Edw., vol. iii. 195, remarks that the male is found on the rocks of 
the coast of La Manche and England, and the female appears to live 
habitually fixed to the branchia of various fishes ; I have never seen them 
on deep-water fishes, though they may infest the littoral species, as 
Father-lasher , &c. 
Genus Anceus. 
A. maxillaris , Lann. 
I obtained specimens dredged with Modiola vulgaris at Bangor in 
Sept., 1835, one from the rejectamenta brought with lobsters from Glen- 
arm, Dec., 1843, and two or three brought with oysters from Stranraer 
(Scotland), also on oysters from Bangor, Down. 
Genus Sphceroma. 
S. serratum, Leach. 
River Lagan and Strangford Lough, W. T. 
S. Hookeri , Leach. 
South of Ireland. J. Y. Thompson. 
8. rugicauda , Leach. 
North of Ireland, W. T. 
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