with its 3 joints gradually diminishing in size, the 1st being provided near the 

 base posteriorly with a bundle of small sensory filaments; setae of both rami 

 very coarse and more or less recurved. Caudal lamellae somewhat constricte 

 in the middle, and having the outer part slightly expanded, each with 9 1 

 marginal spines densely crowded around the blunted extremity, the middl 

 spines being the longest, the others gradually diminishing in length. 



Male somewhat smaller than female and having the shell conspicuously 

 more compressed, with the posterior extremity far less abruptly dilated. Pre- 

 hensile appendage of maxillipeds with the basal part elongate subfusiform in 

 shape, exhibiting inside 2 successive, but rather remote bisetose prominences 

 and projecting at the end outside in a sharp corner; terminal mobile part much 

 shorter than the basal one, but somewhat dilated at the base which is exerted 

 in front to an angular corner followed by a number of well marked serratures 

 of the edge. Prehensile appendage of last pair of limbs rather different in 

 shape, forming a slender, distinctly 3-articulate stem bent in the middle in 

 an elbow-like manner, and provided outside the 1st (basal) joint with a dense 

 series of delicate finely ciliated setae. Copulatory appendages somewhat thickened 

 at the base, but terminating in a very narrow cylindrical extremity. 



Colour in both sexes opaque whitish. 



Length of adult female amounting to 0.95 mm., of male to 0.90 mm. 



Remarks. It may be that the above-described form in reality is identical 

 with one or other of the numerous fossil species recorded; but as I find it 

 impossible at present to decide this with certainty, I prefer to record the species 

 under the specific name given to it in 1865 and admitted by all subseque 

 authors. The 2 forms named by Brady as C. Beyrichi and C. scotica a 

 quoted here as synonyms on the authority of that author. 



Occurrence. Of this remarkable form at first only a few empty shells 

 were found off the Lofoten islands in depths ranging from 100 to 300 fathoms. 

 Subsequently, however, my late father succeeded in picking up a considerable 

 number of specimens from dried mud taken partly from the deeps off the 

 Lofoten islands, partly from several other places of the west coast off Norway. 

 Some of these specimens had still their 2 valves in situ, and on a closer 

 examination I found the enclosed body in a few of them sufficiently w 

 preserved to allow a detailed investigation of the several limbs. 



As to the habits of the animal, very little can be said, as I have not y 

 had an opportunity of observing it in the living state. It may however b 

 inferred from the heavy condition of the shell and the peculiar structure of t 



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