OBOLID^. 541 



^ LiNGULELLA wiRTHi (Barrande). 



Plate XXX, figure 7. 



lAngula wirthi Barrande, 1868, Faiine silurienne des environs de Hof, en Bavi&re, p. 10] , fig. 63. (Described and 

 discussed in French as a new species. Fig. 63 is reproduced in this monogi'aph, PI. XXX, fig. 7.) 



lAngula wirthi Barrande, 1868, Neues Jahrb. fiir Mineralogie for 1868, p. 691, unnumbered plate, fig. 63. (Copy of 

 preceding reference.) 



This is a more elongate shell than Oholus? havaricus (Barrande), and is known only by 

 several casts. It has a length of 15 mm. ; greatest width, 9 mm. In many respects it resembles 

 LinguleUa davisi (McCoy) of the Lingula flags of Wales. ■ The outer surface, is marked by con- 

 centric hnes and striae, as far as can be determined from the casts. 



Formation and locality. — Passage beds between the Upper Cambrian and the Ordovician: (303c [Barrande, 

 186Sa, p. 101\) Suburbs of Hof; and (303f [Pompeckj , 1896a, pp. 7 and 8]) railway cut near Schellenberg, a little distance 

 back of the railway station at Neuhof, near Hof; both in Bavaria, Germany. 



LiNGULELLA ZEUS n. Sp. 

 ^ Text figure 45. 



This species is represented by one very minute specimen, a poorly preserved interior of a 

 suborbicular ventral valve, showing a fairly well defined area. The exterior surface was covered 

 Tvith strong concentric striae. 



Observations. — This specimen is of particular interest as the only representative of the 

 genus LinguleUa from Scotland, where it occurs associated with 

 Olenelloides armatus. The species is too poorly preserved for further 

 description or comparison. 



Formation and locality. — lower Cambrian : (316c) Shales from Locality M4197d 



of the Geological Survey of Scotland, a band probably equivalent to either 6 or 7 of 



the section on the north slope of Meall & Ghiubhais [Peach and Home, 1907, p. 414] on 



the Bruachaig River, 2 miles (3.2 km.) east-northeast of the Kinlochewe Hotel, Loch „ , ,. 



--T^i'ojii Figure iS.—Ltnguleila zeus n. sp. 



Maree, Ross-shn-e, Scotland. i„t„i„, „f ^ ^^g^^t.^i ^^,^^_ ^{^^ 



type and only specimen, X 12, 



LiNGULELLA sp. undt. a. from LocalitySlGc, Lower Cam- 



y/ I brian shales near Loch Maree, 



Plate XXX, figure 13. Ross-shire, Scotland. Thespeci- 



men is numbered M4197d in 



There are two specimens of the dorsal valve in the collection from survey ofsTotiand'!' ^™"'°'°'' 

 the Olenus truncatus zone. The outer surface is marked by fine radi- 

 ating and concentric striae, and the inner surface by large punctae, scattered, as far as known, 

 in the anterior half of the valve. 



Formation and locality. — Upper Cambrian : (310k) Oeland Island, Sweden. 



LiNGULELLA sp. undt. b. 



Imperfect specimens of a small, rather broad form of LinguleUa occur in Middle Cambrian 

 shales at York, Pennsylvania. The outline of the shells is somewhat like that of Oholus willisi 

 (Walcott), but the material is too poor for specific determination. 



Formation and locality. — Middle Cambrian: (48d) Argillaceous shales in the railroad cut beside the gas house, 

 York, York County, Pennsylvania. 



LEPTEMBOLON Mickwitz, subgenus of LINGULELLA. 



[knzdc, small; and 'i^^ohi>, a wedge.] 



Oholus (Leptembolon) Mickwitz, 1896, Mem. Acad. imp. sci. St.-Petersbourg, 8th ser., vol. 4, No. 2, p. 199. (Char- 

 acterized and discussed as a new subgenus; see below for translation.) 



Oholus (Leptembolon) Mickwitz, Walcott, 1908, Smithsonian Misc. Coll., vol'. 53, no. 4, PI. XI, and pp. 142 and 144. 

 (Classification of subgenus.) 



The original description by Mickwitz follows : 



The subgenus Leptembolon is based on a species of Oholus, which externally resembles Lingula very closely, 

 and in fact was by earlier authors regarded as such. The specimens of the internal surfaces of the valves, however. 



