H I ORCHESTIID^l. 



female, bears a close resemblance to that of O. littorea, 

 agreeing with it both in colour and habits ; but we are not 

 sure that it is so common, or that they are found associated 

 together, although frequently confounded with each other. 

 Edwards, Rathke, and Lucas have so mistaken it, sup- 

 posing it to be Montagu's species, as we have ascertained 

 from an examination of the typical specimens in the 

 British Museum and the Museum of the Jar din des 

 Plantes.* 



We first took the species under a stone far above high- 

 water mark in Langland Bay, near Swansea. It was 

 so far from the shore that the grass grew all round the 

 stone, beneath which it was associated with terrestrial 

 Isopoda (Oniscidte). We have also taken it on the 

 shore near the Bailey Lighthouse on the Hill of Howth, 

 in Dublin Bay, in the month of October sparingly, 

 but it was found in numbers, and of various sizes, in the 

 month of January, among gravel on the beach of Rough 

 Island, Shangford Lough, by Mr. W. Derragh, by whom 

 it was communicated to the late Mr. W. Thompson, 

 These specimens are now (together with his whole collec- 

 tion) in the Museum of Belfast, and we have much 

 pleasure in returning our thanks to the trustees of that 

 excellent institution for the use of the whole of the 

 Edriophthalma collected by that late eminent Irish na- 

 turalist. Professor Kinahan has taken it seven feet above 

 tide-mark, mixed with Oniscus murarius, 0. fossor, Arma- 

 dillo vulgaris, and Porcellio scaber. These are the only 

 recorded British habitats, a circumstance that arises most 

 probably from the species being mistaken for O. littorea, 



* We take this opportunity of expressing our obligation to the officers of 

 both these institutions for the courteous reception we have invariably met with 

 from them, the willingness with which every specimen has been placed at 

 our disposal, and the forestalmeut of our wants in facilitating their exami- 

 nation. 



