. Cambrian Brachiopoda. Brachiopoda, Fossil. 792 CAMBRIAN BRACHIOPODA. than the dorsal. The hxrgest ventral valve in the material available for study has a lenj^th of 9 mm. The specific name was given in honor of Dr. Carl Wiman. FoRM.\TioN AND LOCALITY.—Passage beds between the Upper Cambrian and the Ordovician: (310j) Ceratopyge limestone at Borgholm, Oeland Island, Sweden. (8x) Limestone at Slemmestad, about 3 miles ( km.) southwest of Christiania, Norway. Upper Cambrian: (390b [Moberg and Segerberg, 1906, p. 71]) Limestones of the Shumardia zone (zone 3) at Fogel- sang, 5 miles (8 km.) e
. Cambrian Brachiopoda. Brachiopoda, Fossil. 792 CAMBRIAN BRACHIOPODA. than the dorsal. The hxrgest ventral valve in the material available for study has a lenj^th of 9 mm. The specific name was given in honor of Dr. Carl Wiman. FoRM.\TioN AND LOCALITY.—Passage beds between the Upper Cambrian and the Ordovician: (310j) Ceratopyge limestone at Borgholm, Oeland Island, Sweden. (8x) Limestone at Slemmestad, about 3 miles ( km.) southwest of Christiania, Norway. Upper Cambrian: (390b [Moberg and Segerberg, 1906, p. 71]) Limestones of the Shumardia zone (zone 3) at Fogel- sang, 5 miles (8 km.) east of Lund, Province of Malmohus; and (390c [Moberg and Segerberg, 190G, p. 70]) Ceratopyge slate (Zone 3) at Wentlinge, on Oeland Island; both in Sweden. (323w) Black argillaceous shale of Division 3aj3, at Christiania, Norway. EooRTHis ZENO Walcott. Text figures 71A-B'. Eoorthis zeno Walcott, 1908, Smithsonian Misc. Coll., vol. 53, No. 3, p. 106, PI. 10, fig. 8. (Discussed as below as a new species. Fig. 8 is copied in this monograph as fig. 71A.) In outline the ventral valve of this species is somewhat similar to that of some forms of Eoorthis remnicha winfieUens'ls (Walcott) (PI. XCI, fig. 2d), but it differs in having finer radiating ribs and in its smaller size. It is also much smaller than Eoorthis neviberryi Walcott, and it occurs 4,390 feet (1,-338 m.) lower in the same stratigraphic section. The character of the surface is shown by text figure 7lB', and the general form by text fig- ure 7lA. I do not know of any similar form, with such regular, fine, sharp radiating ribs, from the. FiGUKE 71.—j;oorffl!s zcmo Walcott. A, A', Exfoliated ventral valve (U. S. Nat. ). B, Fragment of dorsal valve (U. S. Nat. Mu-s. Cat. No. 62397ti). B', Enlargement of portion ol surface ol B (X 10). The specimens represented are from Locality 54o, Middle Cambrian Ute limestone in Blacksmith Fork, aljout 10 miles ( km.) east of Hyrum, Cache County, Utah. Figure 71A
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