465 



Diftfrilttfion. British Isles (Sp. Bate), Shetland Isles (Norman), 



Bohusliln (Bruzel.), Kattegat (Meinert), the Dutch Coast (Hoek), coast of 

 France (Chevreux), Mediterranean at Algeria (Chevreux), and at Naples (the 

 author), Azores (Barrois). 



2. Paratylus falcatus (Metzger). 



(PI. 164, fig. 1). 



Atylm falcatus, Metzger, Wirbellose Meeresthiere der ostfrisischcn Kiisto, II Beitr. p. 9. 



Syn. : Atylus uncinatus, G. O. Sars. 



Very like the preceding species, as to its outward appearance, 

 though perhaps still stouter in form. Cephalon nearly exactly as in that 

 species. Anterior pairs of coxal plates comparatively smaller, and scarcely 

 as deep as the body; 1st pair considerably tapering distally; 4th pair but 

 little broader than the 2 preceding pairs. Last pair of epimeral plates of 

 metasome produced at the lateral corners to a very small recurved point. 

 Eyes oblong reniform, with a chalky white coating. Superior antennae (in 

 female) comparatively shorter than in P. Swammerdami , scarcely attaining l /s 

 of the length of the body, and having the flagellum but little longer than 

 the peduncle, and composed of a smaller number of articulations. Inferior 

 antennas considerably longer than the superior, with the last joint of the 

 peduncle not nearly twice as long as the penultimate one, flagellum shorter 

 than those joints combined. Anterior gnathopoda somewhat less strongly 

 built than in P. Swammerdami, otherwise of a very similar structure. 

 Posterior gnathopoda with the propodos narrowly oblong in form, and having 

 the palm about the length of the hind margin, and very oblique. First pair 

 of pereiopoda extremely strongly built, being transformed into a pair of very 

 powerful graspers, carpal joint very short and cup-shaped, propodal joint some- 

 what curved, and armed at the base posteriorly with several strong spines, 

 dactylus enormously developed, and of a falciform curve, so as to admit of being 

 folded upon the outer part of the leg. Second pair very small, with the 

 outer part quite rudimentary. The 3 posterior pairs with the propodal joint 

 very short, scarcely more than half as long as the carpal one, dactylus in 

 all very strong and recurved; basal joint of last pair somewhat broader than 

 in the preceding species, with the posterior edge evenly curved and minutely 

 serrated. Uropoda and telson nearly as in that species. Body rather pellucid, 

 with scattered brownish patches. Length of adult female 7 mm. 



61 Crustacea. 



