OLAF HOLTEDAHL. [SEC. ARCT. EXP. FRAM 



JVTollusca. 

 Pelecypoda. 



Prionodesmacea . 



Gra m mys iida e . 



Grainnn/sia VERNEUIL. 



Grammy sia (?) frian<jnl<i((i nov. .sj. 



PI. VIII, fig. 8. 



Only one well preserved right valve of a very small lamellibranch 

 of a peculiar type. Placed preliminarly under Grammysid although it 

 differs strongly from the large shells with strong concentric undulations 

 that are most common in this genus. Vet it certainly approaches that 

 genus -- or to related memhers of the family Gmmmysiidae -- nearer 

 than to any other known groups of lamellibranchs. 



The outline is obliquely and roundly triangular, with the anterior 

 and posterior margin as seen in lateral view meeting nearly at right angles. 

 Kxcept for an abrupt curvature near the margins the shell is nearly flat 

 in longitudinal section, while vertically it is strongly curved, especially 

 in the apical portion. The posterior margin is not wholly preserved, but 

 we see indicated here a sort of minute wing with its plan nearly vertical 

 to that of the shell in general and thus not visible in the lateral view. 



The surface shows a not strong, but distinct concentric striation and 

 in a good light an indication of radiating striae. 



Dimensions of the valve: length i.) mm., height 7mm. 



I do not know of any lamellibranch approaching very near to this 

 form, which may represent only an immature stage. A species which 

 in its younger >tages show a considerable likeness, is HAI.I.'S Gra in - 

 niiixiu (tiphenoiniitu ctuicata from the Hamilton of New Vork '. 



Occurrence: B, upper part, near the fragment-limestone, Valley 



solltll of Dolgell. 



Aviculidae. 



ilcrhii'ti Ooi.nr. 

 Pterineact.aviculoidea I I.M.I.. 



IM. VIII. lig. G. 



A left valve of a medimn-si/.ed lamellibranch which might possibly 

 be inferred l Mi'i/ti nihoit in n ficn loiilca MALI, from the Manlms of l\ew 

 Vork ;iml New Jerse) '-'. but as the shell is not completely preserved I 



See I'.-.l. New Y..rk. L-im.-llil.ran.-liiala II. |. ''>*-. |'l. 62.figS.l-9, pi. IKi. liff. 10. 



HALL, I'.-.l. New York, vol.3, p.274, pi. 49, figs. 7-8, |.l.1'.!i. lip. s. WELLEH. 

 . Survey \' N.'\\ Jersey, vol.3, \>. -2(\'.\, \>\ -2\. Hi;-. 17-18. 



