NO. 5 CAMBRIAN TRILOBITES RESSER 9 



Alokistocare packi, n. sp. 



Ptychoparia piochcnsis Walcott, U. S. Geol. Surv. Bull. 30, p. 201, pi. 26, 

 fig. 2a, pi. 28, ic, id, 1886. (See A. piochcnsis.) 



In the narrowness of the cranicHum this species is Hke A. poniona. 



Occurrence same as preceding. 



Holotype and paratype. — U.S.N.M. no. 90171. 



Alokistocare charax (Walcott) 



Ptychoparia charax Walcott, Smithsonian Misc. Coll., vol. 67, no. 2, p. 31, pi. 6, 



fig. I, 1917. 

 Ptychoparia pylas Walcott (part), idem. pi. 6, fig. 4b. 



This trilobite seems to belong to Alokistocare even though the fixed 

 cheeks are somewhat narrow and eyes sUghtly large, in which respects 

 it recalls Glyphasis, but since it fails to go far enough in that direction, 

 reference to that genus does not seem to be warranted. In the pub- 

 lished illustrations the eye lines are drawn too heavy. 



Middle Cambrian, Gordon; (loc. 4q, 4v) between Gordon and 

 Youngs Creeks, Lewis and Clarke Range, Montana. 



Holotype. — U.S.N.M. no. 63736 ; paratype, no. 63742. 



Alokistocare agnesensis (Walcott) 



Olenopsis ? agnesensis Walcott, Smithsonian Misc. Coll., vol. 57, no. 8, p. 242, 

 pi. 36, fig. 2, 1912; idem (part), vol. 67, no. 3, p. 75, pi. 13, fig. 5, 1917. 

 (Not 5a-c = A. stcphcnciisis.) 



Middle Cambrian, Ptarmigan ; (loc. 35m) 3 miles southwest of 

 head of Lake Louise, Alberta. 

 Holotype.— U.S.l<l.M. no. 58363. 



Alokistocare stephenensis, n. sp. 



Olenopsis ? agnesensis Walcott (part), Smithsonian Misc. Coll., vol. 67, no. 3, 

 p. 75, pi. 13, figs. 5a-c, 1917. (Not 5, see preceding.) 



Middle Cambrian, Ptarmigan: (loc. 58k) north shoulder Mount 

 Stephen, 3 miles east of Field, British Columbia. 



Alokistocare cleora (Walcott) 



Olenopsis cleora Walcott, Smithsonian Misc. Coll., vol. 67, no. 3, p. 74, pi. 13, 

 fig- 3. 30, 1917- 



Lower Cambrian, Mount Whyte ; (loc. 62w) Gog Lake, Wonder 

 Pass, British Columbia. 

 Holotype. — U.S.N.M. no. 64396. 



Alokistocare stator (Walcott) 

 Agranlos stator Walcott, Smithsonian Misc. Coll., vol. 64, no. 3, p. 173, pi. 36, 

 fig. 6, 1916; idem, vol. 67, no. 2, p. 28, pi. 6, fig. 6, 1917. 



