232 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 57 



LINGULELLA MOOSENSIS, new species 



Plate 35, figs. 1-6 



This fine species is quite abundant in several localities. In size 

 and outline of the valves it is not unlike Lingulella davisi (McCoy)' 

 of the Ordovician and Upper Cambrian of England and Wales. It 

 differs in being proportionately more elongate and acuminate in the 

 outline of the ventral valve. It may also be compared with Lin- 

 gulella ampla (Owen).' 



Two of the largest shells are represented by figures i and 6. The 

 form of the valves is best shown by figures 3 and 5. 



The surface is marked by fine concentric lines with stronger lines 

 of growth at irregular intervals. 



Formation and locality. — Lower Ordovician : Goodsir formation 

 (in lower part), Ice River Valley at head of East Fork, elevation 

 8000 feet, on the north side of the amphitheater near the top of the 

 ridge overlooking Ottertail Valley ; also on northwest side of Molli- 

 son Creek, elevation 4800 feet, west slope of Mount Mollison, about 

 6 to 8 miles east and southeast of Leanchoil on the Canadian Pacific 

 Railway, British Columbia, Canada. 



The species also occurs on the west side of Moose Creek Valley 

 on east slope of the north ridge of Mount Mollison, elevation 6550 

 feet, and on west slope of Mount Mollison, elevation 4800 feet, at 

 northwest side of Mollison Creek, about 4 miles southeast of the 

 Ice River Valley as mentioned above. On the east side of Moose 

 Creek near the head of the east fork of the creek it occurs at an ele- 

 vation of 8100 feet. 



Collection, J. A. Allan. 



Mr. L. D. Burling found this species at about the same horizon 

 above a cliff of the Ottertail limestone four miles southwest of the 

 mouth of Otto Creek which flows into the Amiskwi River west-nurth- 

 west of Field, British Columbia, Canada. 



LINGULELLA ? ALLANI Walcott 



Plate 35, figs. 7-9 



In external form this species approaches very closely to Dicellomus 



proliiicus Walcott " from the Middle Cambrian limestones of Utah. 



It also has a longitudinal median depression on the ventral valve 



similar to that of Linsulella buttsi Walcott.'' 



^Cambrian Brachiopoda, Monogr. U. S. Geol. Survey, Vol. 51, 1912, pi. 

 31, figs. 6, 6a-h. 

 ' Idem, pi. 28. 



^ Smithsonian Misc. Coll., Vol. 53, No. 3, 1908, pi. 8, figs. 3 and 3a. 

 ■* Idem, pi. 8, fig. 6. 



