285 



188. Cletodes eurvirostris, Scott. 



(PI. CXCVI, fig. 2). 



Cletodes eurvirostris, Th. Scott, Additions to the Fauna of the Firth of Forth. 12th Ann. Rep. 

 of the Fishery Board for Scotland, p. 250, PI. VIII, figs. 1826. 



Specific Characters. Female. Body slender, cylindrical in form, being 

 only very slightly tapered behind. Cephalic segment fully as long as the 3 suc- 

 ceeding segments combined, rostral projection rather prominent and terminating 

 in an acute recurved point. Urosome much shorter than the anterior division, 

 and having the 3 anterior segments slightly produced at the lateral corners, 

 penultimate segment very short. Caudal rami rather produced, being almost twice 

 as long as the anal segment, dorsal seta issuing far in front of the middle, apical 

 seta of moderate length. Anterior antennae comparatively short, with the 3rd 

 joint scarcely more than half as long as the 2nd. Posterior antenna? with the 

 outer ramus. as in the other species, rudimentary, being replaced by a single 

 ciliated seta. Mandibular palp comparatively small, with 2 lateral and 3 apical 

 setae. Posterior maxillipeds likewise smaller than usual, hand oval in form, seta 

 of basal joint much elongated. Natatory legs shorter and stouter than in the 

 other species, with no seta? inside the outer ramus; inner ramus with the distal 

 joint less produced. Last pair of legs with the distal joint narrow oblong in form, 

 carrying 5 setae, the apical one very strong and elongated, the other 4 compara- 

 tively small; inner expansion of proximal joint conically produced, and extending 

 almost to the middle of the distal joint, marginal setae 3 in number, one at the 

 tip and 2 on the inner edge, the distal one very thick, spiniform. 



Male with the anterior antenna very strongly built, terminal part claw- 

 like. Inner ramus of 3rd pair of legs conspicuously transformed, 3-articulate, 

 middle joint produced at the end inside to a long, somewhat curved spiniform 

 projection, terminal joint small, with a single slender seta at the tip. Last pair 

 of legs smaller than in female, with the inner expansion of proximal joint less 

 produced and provided with only 2 apical setae. 



Colour not yet ascertained. 



Length of adult female 0.68 mm. 



Remarks. This is a somewhat anomalous species, exhibiting in some 

 characters a certain approximation to the genus Enhydrosoma Boeck. The structure 

 of the antennae, however, is that characteristic of the present genus. 



Occurrence. Two specimens only of this form, a female and a male, have 

 hitherto come under my notice. They were found in a sample taken at Farsund, 

 south coast of Norway, from a depth of about 20 fathoms, muddy sand. Th. Scott 

 records this form also from the Finmark coast. 



Distribution. Scottish coast (Scott). 



38 Crustacea. 



