466 



JRrmnrktt. — This form was first recorded by Metzger from the east 

 Fi'isian Coast as Ali/Jus falcatus, and some years afterwards the author, not 

 being at that time aware of Metzger's paper, described the same form from 

 the Norwegian coast under another name, viz , Atylus imcinafus. It is very 

 nearly allied to P. Swammerdami, but may at once be distinguished by the 

 very peculiar development of the 1st pair of pereiopoda, and the rudimentary 

 nature of the 2nd pair. Moreover the miitual longitudinal relation of the 

 outer joints on the posterior pairs of pereiopoda is rather different. 



Occurrence. — I have met with this form in 3 widely distant localities 

 of the Norwegian coast, viz., at Jsederen, south coast of Norway, at Skudes- 

 nses, Karmo, and at Servser, west coast of Finmark. In all 3 places it occur- 

 red rather sparingly in comparatively shallow water, together with P. S/ratn- 

 merdami. It employs its peculiarly modified 1st pair of pereiopoda for getting 

 hold of some fragment of shell, or piece of algse, beneath which it conceals 

 itself with great dexterity. 



Diffrihifirm. — East Frisian Coast (Metzger), Dntcli coast (Hoek), 

 coast of France (Chevreux). 



3. Paratylus vedlomensis (Sp. Bate). 



(PI 1G4, fig. 2). 



Dexani'ine vedlomensif, Sp. Bate & Westwood, Brit. Sess.-eyed Crustacea I, ji. 242. 



Syn.; Atylus vedlomensis, Boeck. 



Bod3' somewhat more slender than in tlie 2 preceding species, and 

 very distinctly keeled dorsally, the carina being elevated in the last segment 

 of mesosome and those of metasome, to compressed, posteriorly-pointing 

 projections. First segment of urosome produced dorsally in a manner similar 

 to that in the said species. Cephalon with the rostral projection somewhat more 

 ]n'ominpnt, anterior edges forming, below the insertion of the superior antennae, 

 a small acute lappet, and farther down a rounded lobe. Anterior pairs of 

 coxal plates scarcely as deep as the body; 1st pair ratlier narrow, and some- 

 what tapering distally; 3rd pair considerably broader tlian the 2nd; 4th pair 

 but little larger than the former, and obtusely rounded at the infero-posteal 

 corners. Last pair of epimeral plates of metasome rather narrow, and rounded 

 at the lateral corners, though exhibiting a very small and obtuse projection 

 interiorly. Eyes comparatively smaller than in the 2 preceding species, and 

 oval in form, pigment dark brown, with a whitish coating. Antennae very 



