. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Figure 36. Diagrammatic representation of the suture of: A, /Arctomee/toceras rotundatum,—Popov (1962a: fig. 9), from Olenekites Zone, northern Siberia, at a whorl height of 20 mm; B, Arctomeefcoceros sp. indet. Kummel (1966: fig. 22E), from Narmia Member of Mianwoli Formation, Surghar Range, West Pakistan, at a whorl height of 9 mm; C, D, two sutures of topotype specimen of Boreomeefcoceros keyserlingi (Mojsisovics) from Olenekites Zone, northern Siberia, C, at a whorl height of mm, D, at a whorl height of 15 mm
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Figure 36. Diagrammatic representation of the suture of: A, /Arctomee/toceras rotundatum,—Popov (1962a: fig. 9), from Olenekites Zone, northern Siberia, at a whorl height of 20 mm; B, Arctomeefcoceros sp. indet. Kummel (1966: fig. 22E), from Narmia Member of Mianwoli Formation, Surghar Range, West Pakistan, at a whorl height of 9 mm; C, D, two sutures of topotype specimen of Boreomeefcoceros keyserlingi (Mojsisovics) from Olenekites Zone, northern Siberia, C, at a whorl height of mm, D, at a whorl height of 15 mm (MCZ 8684). basic morphological elements are better understood. Occurrence. Werfen Formation, Muc, Dalmatia. Repository. Natural History Museum, Vienna. Genus Arcfomeekoceras Popov, 1961 Type species, Mee/coceras rofundotum Mojsisovics, 1886 Compressed, involute conclis, with nar- rowly rounded venters on earlier volutions tending to become more broadly rounded with age. Suture ceratitic with two lateral lobes and auxiliary series. The type and only species of th(> genus is known from the Olcnekilcs fauna of Siberia. Indetermi- nate species have also been recorded from the upper part of tlie Lower Triassic suc- cession in the Salt Range of West Pakistan (Kummel, 1966). Arcfomee/coceras rofundotum (Mojsisovics) Text-figure 36 Meekoceras rotundaliiin , IcSSfi: (S3, pi. 10, fijr. 16; Dicncr, 1915: 194. Borcomcckoccras roltiiidatinu,—Popov, I9()l: 42. Arcfomeekoceras ri>lmi(l(ilu)it,—Popov, 1962a: 187, pi. 1, fiirs. 1, ,5, pi. 3, 4 This is as yet an incompletely known species; Mojsisovics apparently had only one specimen and Popov four specimens but the illustrations and descriptions are incomplete. The key feature of the genus and species is the broadening of the venter on the adoral whorls. The suture (Fig. 36A) has two serrated lateral lobes and a small auxiliary on th(> umbilical wall. Occurrence. Olenekites Zone, Lena River delta and Olenek Ri
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