. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. AA/ Figure 7. Diagrammatic representotion of the suture of specimens of Ofoceros woodwardi boreale. A, complete suture of specimen from Oph/ceras ) Zone from Clavering Island, East Greenland (Spath, 1935, pi. 2, fig. 3b) at whorl height of approximately 75 mm; B, complete suture of specimen from Blind Fiord Formation, Axel Heiberg Island (Tozer, 1961, fig. 7) at a diameter of approximately 90 mm; C, complete suture of Ofoceros indigirense Popov (1958, fig. 1,1) from eastern Verkhoyansk region, Kerekhtyok
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. AA/ Figure 7. Diagrammatic representotion of the suture of specimens of Ofoceros woodwardi boreale. A, complete suture of specimen from Oph/ceras ) Zone from Clavering Island, East Greenland (Spath, 1935, pi. 2, fig. 3b) at whorl height of approximately 75 mm; B, complete suture of specimen from Blind Fiord Formation, Axel Heiberg Island (Tozer, 1961, fig. 7) at a diameter of approximately 90 mm; C, complete suture of Ofoceros indigirense Popov (1958, fig. 1,1) from eastern Verkhoyansk region, Kerekhtyokh brook, Siberia, scale uncertain; D, specimen from eastern Verkhoyansk region, Kerekhtyakh brook, Siberia (Popov, 1958, figs. 1, 2), scale uncertain; E, specimen from upper Indigirko River, Verkhoyansk Mountains, Si- beria, MCZ 6103, at a diameter of 35 mm; F, specimen identified as O. indigirense by Yu. N. Popov from East Khandiga River, Verkhoyansk region, Siberia, MCZ 8685, at a whorl height of 25 mm; G, specimen from upper member of Sodlerochit Formation, Canning River, northern Alaska, at a whorl height o' 100 mm; H, paratype of O. concavum Tozer (1967, fig. 20) from Blind Fiord Formation, Axel Heiberg Island, northern Canada, at a whorl height of approximately 45 mm. whorl heights of 50 or more milliiiit'ters, while those known in O. aoodwardi are from miieh smaller specimens. Adventitious elements in the dorsal saddles of O. icood- icardi are present at a whorl height of mm (Fig. 2A) and are more marked in Diener's specimens (Fig. 2B), which I be- lieve to be taken at a whorl height of 25 mm. It is quite apparent that much more data on the de\elopment of dorsal suture in O. ])oreale are needed. In addition, Spath (1935: 11) noted the larger size of the Arctic forms over those from the Himalayas. Both Spath (1935) and Tozer (1961) stated that they had seen specimens of O. horeale probabh' having a diameter of 300 mm or more. The largest of the Himala\ an specimens (
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