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Extra info for Additional observations on the invertebrates (chiefly ammonites) of the Jurassic and Cretaceous of East Greenland. I. The Hectoroceras fauna of the S.W. Jameson Land

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That the speciesof Entolium throughout the Jurassicand Cretaceousremain extraordinarily constant. The very flat valve figured in Plate V, fig. 5 may perhaps be only provisionally included in this species,since it seemsto have a rather thick lamellar test which showsconcentricribbing only on a part where the outer, smooth layers have been removed by exfoliation. Since in the rather thick-shelled Milne Land forms, previously described, the flat (right) valve is concentrically ribbed, whereas the more convex left valve is smooth, or at least shows only very fine lines of growth, it is probablethat the mode of preservationis responsiblefor the di{Terent aspect of this second example.

A t . o m G r o n l . , v o l . 9 9 , N o . 3 ) , 1 9 3 6 , p . 1 1 6 , p l . 4 7 , f t g . 7 . s) Mineral Conchology, vol. 108, pl. 3. 44 L. F. Sp,rrn. III Jukes-Brownel)from the samedepositand was said to be indistinguishable from the Oxfordian original; presumably that name was applied to a more rugoseform than the present,with raised, concentriclamellae in addition to the growth-lines2). Examples from West and East Spitsbergen,referred by Sokolov and Bodylevskys)and by Weira) to the present speciesare from doubtful deposits,the age of which will be discussedwhen the Hectorocerasfauna is compared with the assemblagesknown from Spitsbergen.

Family TRIGONIIDAE. Genus TRIGONIA, Bruguidre, L789. Trigonia sp. ind. Two smooth, internal casts of a Trigonia indicate a slightly more elongated form than that previouslyl) figured from the Aucella River, with a more prominent umbo. The thickness of the larger (right) valve is 22 mm (without test); in the smaller left valve it is about 15 mm. The casts are not referable to the Portlandian T. The few forms found in the Upper Volgian and the Riasan Beds are incompletelyknown; and among the there is none that has a comparspeciesfrom the Spilsby Sandstonea), able shape.

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