October, 1913. New Trilobites — Slocom 75 



two cephalons from the top of the Lower Maquoketa beds at Elgin, 

 Iowa, and a pygidium, which is referred with some doubt, from the 

 same horizon at Bloomfield, Iowa. 



Genus ECCOPTOCHILE Corda 1847. 



Body subovate in outline. Cephalon subsemicircular. Genal 

 angles produced into spines. Glabella of uniform width rounded and 

 full in front, glabella furrows short, transverse, posterior glabella lobe 

 isolated or nearly so. Eyes holochroal. Pygidium short with three 

 annulations on the axis, pleural lobes produced into three pairs of flat 

 digitate extensions, obtusely rounded at their extremities, which do 

 not extend beyond the marginal arc. {Clarke, Pal. Minn., Vol. Ill, pt. 

 2, P- 37*-) 



Eccoptochile ? meek anus* S. A. Miller. Plate XVII, Figs. 6-9. 



1873. Ceraurus icarus Meek, Pal. Ohio, Vol. I, p. 162, pi. 14, figs. 

 1 ia-c. 



1889. Ceraurus meekanus S. A. M., N. Am. Geol. and Pal., p. 537. 



Type specimens Nos. 2409, 10837 University of Chicago. 



Body subovate in outline, moderately convex, distinctly trilobed. 

 Surface smooth to the naked eye but under a magnifier the cephalon 

 appears finely granulose. 



Cephalon subsemicircular, somewhat flattened anteriorly, genal 

 angles produced into short spines, posterior margin nearly straight until 

 it merges into the genal spines, where it is bent nearly at right angles 

 (PI. XVII, fig. 8). Glabella subquadrate, rounded in front, length in 

 front of the occipital furrow about equal to the width, depressed convex. 

 Anterior lobe of the glabella transversely oval, about twice as wide as 

 long, lateral lobes nearly transverse and about equal in size. Glabella 

 furrows distinct, length about one-third the width of the glabella, 

 anterior pair bent backward; middle pair nearly at right angles to the 

 axis of the glabella; posterior pair similar to the middle pair for most of 

 the length but having the inner ends abruptly bent backward until 

 they meet the occipital furrow, isolating the posterior glabella lobes; 

 occipital segment arched upward somewhat higher than the rest of the 

 glabella, wider in the median portion, tapering towards the dorsal 

 furrows; occipital furrow deep and narrow, arched forward. Dorsal 

 furrows deep and narrow, diverging slightly at the posterior margin of 

 the cephalon, thence passing to the front of the glabella, which they 



*As this pappr is going to press, the writer is informed that a new genus has 

 been made by Barton of which this species is the genotype. 



