NEW BRITISH TERRESTRIAL ISOPOD. 43 



part. Last pair of legs in both sexes with the last joint densely ciliated on 

 the outside. Inner ramus of first pair of pleopoda in male not very conspi- 

 cuous, biarticulate ; the terminal joint about twice the length of first, slender 

 and needle-shaped, and produced just slightly beyond the first joint of inner 

 ramus of second pair. Inner ramus of second pair biarticulate, proximal joint 

 short ; the distal joint greatly produced, reaching almost to tip of last pair of 

 pleopoda, comparatively robust, and gradually tapering to a needle-like point. 

 Uropoda with outer ramus about twice the length of basal part, inner ramus 

 beino- narrower and shorter. Colour in the living animal dark reddish brown 

 marbled with white. Length of largest males and females about 3' 5 mm. 



Remarks. — So far as I have been able to ascertain this species has not 

 liitherto been described, and I am indebted to the Rev. Thomas II. R. Stebbing, 

 r.R.S., and Dr. Budde-Lund for their kind assistance in examining the 

 literature on the subject which had not been available to myself. This species 

 is at once distinguished from all the other British species of Triclioniscus by 

 the form of the last segment of the metasome, which is broadly and evenly 

 rounded at the tip, instead of being truncate as in the other species. The 

 type of coloration resembles that of T. pimllus, Brandt, although the pigment 

 itself appears to be somewhat darker. Two individuals from the second- 

 named locality noted below were, however, uniformly coloured bright orange. 

 The form of the second pair of pleopoda in the male bears a close resemblance 

 to that found in T. 2^^/[fi»a;us, Gr. 0. Sars, the distal joint however being com- 

 paratively much more robust in the species under consideration. On the other 

 hand, the /irst pair is not at all obtrusive when the animal is viewed from tlie 

 side, being unlike 2\ jtygnKeus in this respect, where the first pair is greatly 

 produced, and is most conspicuous when seen from the same point of view\ 



Occurrence. — I first met with this species in a field near Alexandra Park, 

 Glasgow, where I obtained two individuals. It was in company with 

 T. lyiigmceus * and Triclioniscoides albidus (Budde-Lund). Subsequently I 

 found it in one of the propagating houses in the Botanic Gardens, Glasgow^ 

 where I obtained quite a number of specimens. Its movements are quick, 

 and it runs with great agility when alarmed. 



* I observe iu the December number of cbe ' Annals and Magazine of Natural History ' 

 (vol. xviii. p. 474) a note hj Mr. Eichard S. Bagnall, F.E.S., on the occurrence of J", pi/ffimeiis, 

 G. O. Sars, at Winlaton and Newcastle-on-Tyne. This species he regards as new to the 

 British fauna. I ma^' be permitted to observe, however, that I drew attention to the occur- 

 rence of this species within the Clyde faunal area in a paper read to the Glasgow Natural 

 History Society on 2Gth June, 1906, and a report of this paper was published in the ' Glasgow 

 Herald ' on the 30th of June. I have found this species, as well as the under-noted which I 

 have lately added to the Scottish records — the last-named being for the West of Scotland — 

 to be widely distributed throughout the Clyde faunal area; Trichotiiscoides albidus (B.-Lund), 

 Haplophthalmus danicns, B.-Lund, Porcellio dilatatus, Brandt, Armadillidnun nasatum, 

 B.-Lund, and Metoponorthus pnnnosiis (Brandt). 



