189 



anteriorly with a strongly uncinate claw; terminal joint with 3 similar claws 

 accompanied by a number of curved setae. Maxillae with the masticatory 

 lappet simple, securiform, and exserted to a slender point, outer edge coarsely 

 serrate; palp comparatively narrow, with one lateral and 3 short apical setae. 

 Anterior maxillipeds with the basal part rather broad and provided outside 

 with a densely serrated crest, terminal part exserted to a narrow incurved lash 

 armed outside with 4 strong spinules and having inside at the base the usual 

 appendicular spine. Posterior maxillipeds of moderate size, with the propodal 

 joint about equal in size to the basal one ; dactylar joint forming a strongly 

 uncinate claw, with a small appendicular spine inside. Natatory legs of com- 

 paratively feeble structure, with the rami rather narrow and nearly equal-sized 

 in the 3 anterior pairs; inner ramus of 4th pair somewhat smaller, with the 

 terminal joint narrow oblong in form and only provided with 2 spines at the 

 end. Last pair of legs with the free joint short cylindrical in form, apical setse 

 rather small, the outer one the longer. Ovisacs very narrow and elongated, 

 cylindrical in form. 



Body in female of a whitish grey colour, with dark fuscous translucent 

 ovarial tubes. Eye well marked, of bright red colour. 



Length of adult female 1.65 mm. 



Remarks. The present form, as above mentioned, was briefly described 

 by my late father under the above name, and has subsequently been observed 

 by several other authors, though the specific identity was not recognised by 

 them. I regard it as beyond doubt that the form recorded by Claparede as 

 S. Sarsii is the very same species, and this seems also to be the case with 

 S. Leukartii of Kossman and with Lichomolgiis sabellce of Thompson. 



Occurrence. My late father found this form attached to the gills of 

 Sabella Sarsi captured off the west coast of Norway. I have myself met with 

 this Copepod in 2 widely distant localities, viz., at Kvalo, on the Nordland 

 coast, and at Risor, south coast of Norway. In both localities only a single 

 female specimen was obtained among dredged material and detached from 

 its host. 



Distribution. British Isles (Thompson), coast of France (Canu), Medi- 

 terranean (Claparede, Delia Valle). 



25. Crustacea 



