ON THE ANASPIDAGEA, LIVING AND FOSSIL. 579 
The telson is ovate or conical, with a border of short 
uniform setz round the posterior three quarters of the 
margin. The uropods projected slightly beyond the telson 
and were fringed with uniform sete. Fritsch figures an 
otocyst at the base of the inner ramus. 
Length.—About 13 mm. 
Occurrence.—In Coal-measures of Nyran near Pilsen; in 
older strata than those in which Gam psonyx occurs. 
Genera of doubtful position. 
Genus Acanthotelson (Meek and Worthen 2). 
Two species are described, A. stimpsoni and A. in- 
TEXT-FIG. 62. 
Per 
a 2 
sith Ht N on 
Acanthotelson stimpsoni. Reconstruction after Packard. 
Lateral view. 
equalis. Packard gives a restoration of the genus. He 
figures besides a head segment, seven thoracic and six 
abdominal segments and a telson. The eyes are unknown. 
The first antenne had a three-jointed peduncle and a single 
flagellum, according to the restoration, though it appears that 
it may have had two. The second antenna was apparently 
without scale. The seven thoracic limbs were long, fairly 
stout, and without exopodites. The first two limbs were 
raptorial in structure and furnished with long spines on the 
