British Land Isopoda. 73 



I have found this pretty little species in my garden here 

 (the Red House, Berkharasted, Herts). It occurs in com- 

 pany with Trichoniscus roseus in a cool greenhouse. The 

 genus is allied to Triclwniscus. The species may be recog- 

 nized by its simple eyes and the longitudinal series of tubercles 

 which pass down the body. 



Other specimens in my collection are from Denmark 

 {Copenhagen Mus.). It has also been found in Norway, 

 Holland, and France. 



A near ally, H. Mengii^ Zaddach, which is known to have 

 a wider distribution, may be found in Great Britain. It is 

 distinguished from its ally by having six longitudinal finely 

 crenulated ribs passing down the body, instead of the rows of 

 tubercles, and by the peculiarity of having two very prominent 

 ribs on the back of the third segment of the pleon. 



These species are admirably figured in Sars's beautiful 

 work now in course of publication — a work which no carci- 

 nologist studying the Isopoda can do without. 



Trichoniscus pusillus, Brandt. 



Philoiirgria celer and P. riparia of Kinahan are synonyms. 

 This little species appears to be widely distributed in our 

 islands. My specimens are from the counties of Durham, 

 Northumberland, and Herts, and from Connemara, Ireland. 

 I also have it from Denmark [Copenhagen Mus.). Mr. T. 

 Scott (5) finds it about Edinburgh. Exeter [Parjitt) ; Cum- 

 brae, Scotland {D. Rohertson) . 



Trichoniscus vividus, Koch. 



This is Philourgria vivida^ B. & W. Taken by Kinahan 

 under stones and moss on hills at Portland, co. Waterford. 

 I am not aware that it has since been found in our islands. 



Trichoniscus roseus^ Koch. 



This is the Philourgria rosea oi Kinahan. I have found 

 it near Torquay and in my garden here. Mr. T. Scott 

 records it from Tarbert on Loch Fyne, and Dr. Scharff has 

 taken it at Dublin and received it from Ballyfinder, co. Down. 



Oniscus asellusy Linn6. 

 This is also O.fossor, B. & W. It is found everywhere. 



Philoscia muscorum, Scopoli. 

 Widely distiibuted. 



