Beaumont — Fauna and Flora of Valencia Harbour, Ireland. 819 



latter. In N. tenuis the blood is usually so deeply coloui'ed 

 that the blood-vessels appear conspicuously red under a simple 

 lens (in large individuals they can be easily seen with the naked 

 eye), which is not the case in N, flavida. There is no appre- 

 ciable difference in the armature of the proboscis in the two 

 forms ; in both, the central stylet agrees with M'lntosh's figure 

 of that structure in T. flavidum. In both, the gut is much less 

 cut up into caeca than is the case in the Tetrastemmidae. 



A single specimen (10 mm. long) was taken at Yalencia 

 between tide-marks, belonging, I believe, to this species ; and 

 probably also several other small individuals, but they were 

 taken at a time when I had not clearly distinguished between 

 N. flavida and N. temiis. Moreover young examples may 

 prove difficult to determine. 



Family— AMPHIPOPvID^. 



Genus — AarPHrpoEus. 



Amphiporus lactifloreus (Johnston). 



Generally distributed round the shores of Yalencia Harbour 

 under stones between tide-marks. 



Amphiporus dissimulans, Hiches. 



Amphiporus dissimidans, Hiches (1893, p. 10). 



? Amphiporus roseus, Joubin (1894, p. 128). 



This species is not known to occur outside the British area, 

 but the suggestion of Eiches that it may be identical with the 

 A. roseus of Joubin, found at Roscofl and Banyuls, appears pro- 

 bable. It is at any rate certain that A. roseus, Joubin, is not 

 the A. pidcher, M'Intosh, as the former author imagines. 

 Joubin gives us no information as to the central stylet appa- 

 ratus and the position of the cerebral organs in A. roseus (in 

 which points A, dissimulans agrees with A. lactifloreus, and 

 differs markedly from A. pulcher), but his di'awings of the 

 head of A. roseus (fig. 16, p. 129) prove that it is not the 

 A. pulcher of M'Intosh, which has secondary grooves running 

 forward from the cephalic fruTOws, similar to those of A. ma/r- 

 moratus and Drepanophorus. Amphiporus pidcher, Biirger, is 

 apparently another distinct species. It has the cerebral organs 

 behind the brain, but it appears to lack two of the most charac- 



