466 J- P- J- Ravn. 



valve has a somewhat different form, its concavity being considerably 

 fainter than is the case in P. validus. 



Distribution. Nlorth-Ejast Greenland: "Kloft I" on Store 

 Koldewey Island (9 spec). — ? Top of Muschelberg on Hochstetter's 

 Foreland (3 spec). — ? In a boulder from the south side of Vester- 

 dalen at Danmarks Havn (1 spec). 



27. Pecten (Camptonectes) sj). 



From "Kløft II" on Store Koldewey Island we have 3 double- 

 valved specimens and a single left valve of a Pecten, which does not 

 seem referable to any species hitherto described. 



The valve is circular in outline with bul little prominent umbo, 

 which bends strongly forwards. The left valve strongly inflated; 

 the posterior ear small, almost rectangular; the anterior ear not 

 visible; the adductor scar rounded-triangular; no sculpture apparent 

 on the surface. The right valve ([uite flat; its cast with a broad 

 and deep furrow from the umbo down to the middle of the anterior 

 margin; a similar, but less deej) furrow along the upper part of the 

 posterior margin ; the surface — at least near the ventral margin — 

 with fine, dense, fairlj' regular, concentric lines, as also radial lines 

 of a similar nature; the surface of the valve thus has a characteristic, 

 papillose character, similar to that in P. lens Sow. 



Left vahe: height (S7 mm, breadth 84 mm and thickness ca. 

 1Г) mm. 



The species described, the casts of which — owing especially to 

 their ol)liquity — resemble to a certain extent casts of an Ostrea, 

 has some resemblance to P. validiis Lixdsth., from which however it 

 is distinguished by its left valve being not a little more arched; 

 further, the two folds, which run on the inner side of the right valve 

 along respectively the anterior and posterior margin, are much more 

 marked and longer than in P. ualidiis. The specimens probably belong 

 to a new species, related to P. lens Sow. 



28. Pecten (Camptonectes) sp. 



In the same boulder which contained Pecten demissus and which 

 came iiom the east side of Harefjæld at Danmarks Havn, there was 

 also a single, small valve of another Pecten. The sculpture of the 

 valve shows, that it belongs to the subgenus Camptonectes. A closer 

 determination is iiupossible, however, as the whole of the region 

 near the cardinal margin is wanting. 



