46 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 98 



KOOTENIDAE, new family 



OLENOIDES Meek, 1877 



OLENOIDES MALADENSIS, n. sp. 



Plate io, figs. 27, 28 



Only pygidia have been found. The cranidia are difficult to dis- 

 tinguish from Kootenia but none in the collection seem to be large 

 enough to warrant consideration as O. maladensis. 



The axis is long and stout, terminating abruptly at the marginal 

 furrow. Four axial rings and a terminal segment are clearly defined 

 by rather broad furrows. Four pleura are clearly defined, each ending 

 in a long, recurved spine. The rear pleuron is flexed back around the 

 rear lobe of the axis. The anterior axial rings have blunt spines. 

 Surface very granulose. 



Locality 54s. 



Holotypc and paratype. — U.S.N.M. Nos. 98531a, b. 



KOOTENIA Walcott, 1888 

 KOOTENIA CONVOLUTA, n. sp. 



Plate 10, figs, i-ii 



This species is very abundant, and the material includes several 

 enrolled examples that are rare in the Cambrian. K. convohita and 

 associated species are about .the only species of Kootenia that are 

 granulated. However, it will be noted that there is a tendency toward 

 lining and scaly structures rather than rounded granules. 



Glabella rectangular, without trace of glabellar furrows. Occipital 

 furrow deep, neck ring extended into a short, rapidly tapering spine. 

 Anterior pits in the dorsal furrow are deep, which consequently 

 narrows the glabella at this point. Glabella extends beyond the anterior 

 angles. Anterior furrow increases in depth and turns somewhat back- 

 ward beyond the corners of the glabella, thus widening and making 

 concave the rim and at the same time leaving a steep escarpment 

 behind it, which takes the place of the eye line. Front outline of the 

 head curved with the slight recession in the center. Fixigenes and 

 eyes about average for the genus. 



Libragenes small and narrow ; the thorax has seven segments. 



Pygidium semicircular, axis arched, and divided into three rings 

 and a large rear segment by three axial furrows, which are more 

 deeply impressed on the sides than in the middle. Pleura well fused 

 but with pleural furrows in the anterior portion indicated by short, 

 deep depressions. A well-defined flattened rim is delimited by a 



