l6 SMITHSONIAN MISCELLANEOl'S COLLECTIONS VOL. Q/ 



KOOTENIA MATHEWSI, n. sp. 



.Plate 3, figs. 6, 7 



This species belongs to the seven-spined group. It is characterized 

 by long, round spines, the longest likely exceeding the length of the 

 pygidium. The seventh pair is short and slender. 



This species is very similar to K. spencci, being distinguished by 

 the smaller spread and curvature of the spines and their lack of 

 median grooves. 



Locality 20x. 



Holotypc and parafypc. — U.S.N.M. no. 96507. 



KOOTENIA GRACILIS, n. sp. 



Plate 3, figs. II, 12 



This beautiful trilobite is associated with Ehnianiella and Olenoidcs 

 brighamensis in the thin limestone layers intercalated in the shales. 



K. gracilis is one of the few^ six-spined species in the genus. Evi- 

 dently the seventh pair, which is usually greatly reduced, has become 

 altogether obsolescent. The glabella is long, but otherwise the cra- 

 nidium is normal in all respects. Fusion is normal in the pygidium 

 and the long, slender spines are straight and hence well spread out. 



Locality 20x. 



Holotypc and paratypc. — U.S.N.M. no. 96508. 



PTYCHOPARIDAE Matthew 



ALOKISTOCARE Lorenz, 1906 



ALOKISTOCARE IDAHOENSE, n. sp. 



Plate 4, ligs. 8, 9 



This species has zT) or 24 thoracic segments and is finely granulated 

 on the outer surface. Exfoliated surfaces show lines and punctation. 

 The genal spines extend back to about the fifth thoracic segment. 

 The pygidium is completely fused. 



Locality 55c. 



Holotypc and paratypc. — U.S.N.M. no. 96507. 



ALOKISTOCARE SPENCENSE, n. sp. 



Plate 4, figs. 10, II 



This is also an abundant species associated with A. idahocnsc. 

 Compared to that species, A. spcnccnsc is characterized by a narrower 



