242 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL, 5/ 



OLENOPSIS ZOPPII Meneghini 



Plate 36, figs, z-y 



Olenits zoppii Meneghini, 1882, Proc. Verb. Soc. Tosc. Sci. Nat., July 

 2, 1882 ; Fauna Cambriana dell' Iglesiente, p. 163 : Note alia Fauna 

 Cambriana, etc. (Idem, Nov., 1883.) 



Conocephalites sp. Meneghini, 1882, Fauna Cambriana dell' Iglesiente. 



Olcnus zoppii .Meneghini, 1888, Mem. Real. Comitato Geol. Italia, Vol. 3, 

 Pt. 2, Pal. deir Iglesiente Sardegna, p. 7. 



Olenopsis zoppii Bornemann, 1891, Nova Acta Kais. Leop.-Carol. 

 Deutsch. Akad. Naturforscher, Bd. 56, No. 3, p. 459. 



References to the very full description and illustration of this 

 species by Doctor Bornemann are given under the genus Olenopsis. 



OLENOPSIS ? AGNESENSIS, new species 

 Plate 36, fig. 2 



Olenopsis agues Walcott, 1908, Smithsonian Misc. Coll., Vol. 53, No. 5, 

 p. 214. (Name printed by error as agnes in lists of fossils from No. 

 3 of the Mount Whyte formation.) 



The cephalon of this species is much like that of Olenopsis zoppii, 

 except that the fixed cheeks are broader and the palpebral lobes 

 smaller. The thoracic segments are of the same character, except 

 that the outward extensions of the pleural lobes are shorter and 

 broader. The pygidium is more transverse and it has the axial lobe 

 divided into segments by four transverse furrows, that are continued 

 out as faint furrows on the pleural lobes. 



Olenopsis ? agnesensis differs from Olenopsis roddyi in its thoracic 

 segments and pygidium, and presumably in its cephalon. It agrees 

 with Olenopsis americanns in having less prolonged extensions of 

 the pleurae of the thoracic seginents, but differs in the details of the 

 cephalon. The most marked difference is in the character of the 

 pygidium which is more like that of Ptychoparia or Liostracus than 

 that of Olenopsis. The greatest point of similarity in the four 

 species is the finely reticulate surface formed of irregular, very 

 minute ridges. 



Formation and locality. — Lower Cambrian: (35e) Dark gray 

 siliceous shale forming the lower two feet of 5 (64 feet) of the Lakes 

 Louise and Agnes Section, amphitheater between Popes Peak and 

 Mount Whyte, south of Lake Agnes, south of Laggan, on the 

 Canadian Pacific Railway in western Alberta; (35m) Mount Whyte 

 formation (Albert ella zone) 3 miles southwest of the head of Lake 

 Louise, on east slope of Mount Whyte, Alberta; and (57t and 58q) 



