C.D. Walcott—New Genus of Cambrian Trilobites. 39 
another trilobite attached to it, back of the fifteenth se 7 
yt ) gment. 
n 1884 Mr. EH. Hurlburt, of Utica, N. Y., was collecting in the 
oop locality and found a more perfect specimen that showed 
the true structure of the trilobite. It was discovered to be the 
Fig. 1. Fig. 2. 
Enlargement of the posterior portion 
of Fig. 1, showing the spine on the 
15th segment and the posterior 10 seg- 
ments and pygidium. 
type of an undescribed genus 
that appears to be intermedi- 
ate between the genera Para- 
doxides and Olenellus, or a 
form in which the cbaracteris- 
tics of Paradoxides are chang- 
Type. apecimen; nat. size ing into those of Olenellus, the 
gees as. head and first fourteen seg- 
ments being, in all particulars, the type of Olenellus, and the 
Wy. gidium and ten posterior segments more the type of Para- 
— the fifteenth segment represents the telson of Olenellus 
npsonr. 
th The fifteenth segment fits snugly up against the fourteenth ; 
; © axial lobe is strong, and supports the base of a long, slender 
os that, as now preserved, extends back to the pygidium; 
base of the spine originates on the dorsal surface of the 
Segment and also extends back so as to include the posterior 
the and causes the latter to curve back towards the center ; 
© Jateral pleuras of the segment are short and, in structure, 
iminutive representatives of the large pleurse of the segments 
anterior to the fifteenth. 
