238 DUBLIN UNIVERSITY 



bably would not have done if the specimens had been within his 

 reach for examination. 



Under the name of Oammarus Puteanus, Koch has described and 

 figured two species. With the second of these, Mr. Westwood's species 

 agrees so nearly, that I believe it to be the same, and if, as I ima- 

 gine, the species be identical, then Schiodte's specific name of Stygius 

 will stand for all three, since undoubtedly both species of G. Puteanus 

 belong to the genus of Niphargus. The specific name of Puteanus will, 

 therefore, continue to be associated with the first described and most 

 typical species of Koch. 



M. Guerin-Meneville, of whose courtesy and kindness I cannot 

 speak too highly, allowed me, when in Paris last autumn, to examine 

 and take notes from his unpublished drawings and memoranda. Among 

 these I found the figure of a Niphargus, that appears to be identical 

 with N. Puteanus, that had been sent to him from the environs of St. 

 Leger, Poictiers. 



Judging from drawings and descriptions of the foreign, and examina- 

 tion of the only recorded British species, the specimens found in Hamp- 

 shire and Wiltshire are distinct from any hitherto known. They in- 

 clude two new species and a new genus, of which the following are 

 short descriptions : — 



Niphargus fontanus (n. s.). {Figs. 2 8f 2 a.) 



Male. — Eye minute, yellow. Superior antennae with the peduncle 

 as long as the flagellum. Inferior antennas with the last two articula- 

 tions of the peduncle subequal ; flagellum not so long as the last articu- 

 lation of the peduncle. 



First pair of gnathopoda a little smaller than the second ; second 

 pair of ditto having the propodos straight above and convex below, pro- 

 duced inferiorly and posteriorly, and fitting into a groove in the carpus ; 

 the palm as long as the superior margin, very oblique, waved and 

 fringed with a series of equidistant solitary hairs, and one great move- 

 able spine that antagonizes with the apex of the dactylos. Dactylos 

 slightly curved, unguiculate, armed with a single tooth on the inner 

 margin. The three anterior segments of the pleon terminating posteriorly 

 and inferiorly in a point. Posterior pleopoda with the first articulation 

 of the long ramus longer than the second, and the entire member nearly 

 as long as the pleon. 



Length about J an inch. 



