Spath L.F.'s Additional observations on the invertebrates (chiefly PDF

By Spath L.F.

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Extra resources 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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Cit' (LeLhaea rossica, vol. II) p' 225, pl. xvl, fig. 1. 1g35. Crinoidenstielglieder. Aldinger, loc. cit. (Medd. , vol. 99, No. 1), p . 1 0 . Most of the slabs,like that figured by Dr. Aldinger and the smaller piece representedin Plate v, fig. The exterior seemsto be quite plain. The referenceto Eichwald's speciesfrom the Volgian is, of course, tentative; and it is, perhaps, open to criticism if a fragment figured by Rouillierl) is correctly identified with P. tenellus'Since the cross-section of the latter speciesis pentagonal,with almost conYexsides,the present form is probably closerto Rouillier's P.

S t . V I I , v o l . X V I I I , N o . 1 , 1 8 ? 2 ,p . 1 5 1 ,p l . 1 4 a - d , p l . 1 ? ( M e d do. m G r o n l . ,v o l . 9 4 , N o . 1 ) , 1 9 3 3 ,p . 3 1 , p l . I t I , I i g . 2 6 . Greenl. 41 b. Order SCHIZODONTA. 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.

Proc. 50, 1929, pp. 151-161' {) See Woods: Monograph Cretaceous Lamellibranchia of England, vol. I, pt. 2, 1900, pp. 9 (Trigonia ingens, Lycett, T. keepingi, Lycett, T. tealbgensis, Lycett). L. F. Sp,rrn. 4. (Eriphyla) laevis (Phillips)1), especially a Claxby Ironstone (Valanginian) example figured by Woodsz),but the convexity of the valves in that speciesis greater. Woods already pointed out that A. saemannzand A. leavis were allied and that in some casesthe resemblancewas very close;transitional forms betweenthe two speciesat intermediatehorizons may thus, perhaps,be expectedto occur.

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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 by Spath L.F.


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