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with the basal part uniarticulate, hand narrow oblong in form. First pair of legs 

 very slender, with the first 2 joints of the outer ramus subequal in size, last joint 

 very small and armed with 5 claws gradually increasing in length inwards; inner 

 ramus much shorter than the outer, all 3 joints setiferous. Last pair of legs 

 with the proximal joint very short, distal joint oblong, flattened, with 3 strong 

 spines at the tip, and 2 smaller ones on the outer edge, surface transversely 

 rugulose. 



Male differing but little from female in external appearance, though 

 easily recognizable by the more strongly built and prehensile anterior antennae. 

 Urosome distinctly 5-articulate, 1st segment much the largest and provided on 

 each side, at the postero-lateral corners, with a small appendage tipped with a 

 strong spine. 



Colour dark chocolate brown, anterior part of cephalic segment lighter. 



Length of adult female 1.20 mm. 



Remarks. I think Prof. Brady is quite right in considering the Sterope 

 interrupta of Goodsir to be the present species, and as the specific name bopy- 

 roicles, proposed by Glaus and accepted by most other authors, is of much later 

 date, it ought to give place to that given to the species by Goodsir. The Alteutha 

 norvegica of Boeck is the same species, as is also most certainly the Peltidium 

 conophorum of Poppe. I have often met with specimens in which the middle of 

 the 3 setae issuing from the inner corners of the caudal rami has been broken 

 off near the base, giving it exactly the appearance figured by Poppe from his 

 solitary specimen. 



Occurrence. This is one of our commonest Copepoda, occurring rather 

 abundantly along the whole south and west coast of Norway, at least up to the 

 Trondhjem Fjord. It is generally found in depths varying from 2 to 20 fathoms 

 among Laminariae and other algae, and is easily observable even to the naked 

 eye, on account of its dark-coloured body. It is rather an active little creature, 

 swimming about with considerable speed and a somewhat rolling motion, now 

 and then affixing itself to the fronds of the algae or the walls of the vessel in 

 which it is observed. When disturbed, it rolls itself almost into a ball, and 

 remains in this attitude quite immovable for some time. 



Distribution. British Isles (Brady), Heligoland (Glaus), Baltic (Poppe), 

 coast of France (Canu), Mediterranean (Canu). 





