264 THE DEVONIAN OF MISSOURI. 



1902. Proetus protuberans Weller, Geol. Surv. N. J., vol. 3, p. 296, pi. 32, fig. 2. 

 1913. Proetus cf. protuberans Ohern, Geol. Surv., Md. Low. Dev., p. 490 pi. 89, figs. 

 2-4. 



Description — Pygidium small, semi-circular, axis conical, conspicuously elevated, 

 having 7 or 8 annulations. Lateral lobes with 4 or 5 depressed pleura. Distinct, flat- 

 tened marginal border present. 



Two glabellae occurring in the upper beds apparently belong to this species. These 

 are prominent, broadly rounded in front, with indistinct lobing, tapering gradually 

 to frontal margin, only a slight portion of which is preserved. 



Remarks — With the exception of the smaller size, the specimens do not show any 

 essential differences from those figured from the New York Oriskany. 



Horizon — Lower and upper beds. 



Figured specimens No. 27546 Walker Museum. 



Proetus sp. 



A number of pygidia of Proetus are present in the upper beds too imperfectly pre- 

 served to be identified. 



Family Lichadidae 

 Genus Lichas Dalman 



Lichas sp. 

 Plate 71, figures 8, 9 



A few fragments of the cephalon of a large Lichad occur which are not determinable. 

 The surface is covered with prominent pustulae of variable size, and might suggest such 

 a species as Lichas pustulosus Hall. 



Horizon — Lower beds. 



Figured specimens No. 27544, Walker Museum. 



Genus Ceratolichas Hall and Clarke 



Ceratolichas gryps Hall 



Plate 71, figures 13-15 



1876. Acidaspis n. sp? Illustrations of Devonian Fossils, pi. 19, fig. 1 (not figs. 2 



and 3). 

 1888. Lichas (Ceratolichas) gryps Hall, Pal. of New York, vol. 7, p. 84, pi. 19b, figs. 

 7-13. 



Description — Glabella large, embracing nearly the entire cephalon. Frontal lobe 

 elliptical, convex or tumid, elevated behind, sloping abruptly to the sides and the pos- 

 terior margin, and becoming obsolete at or just behind the centre of the shield. It bears 

 at its summit two strong, diverging, recurved spines, which nearly equal the glabella in 

 length. Longitudinal furrows subparallel, diverging near the frontal margin. Lateral 

 lobes depressed, becoming obsolete; the members of the first and second pairs have 

 coalesced, and the third pair can be detected only as low, obsolescent nodes bearing a 

 faint tubercle. Near the outer edge of the lateral lobes, and just within the eye lobes, 

 are slender erect pines, usually represented by the broken bases. 



The anterior slope of the glabella is broad and nearly vertical, the occipital furrow 

 narrow, and the occipital ring broad upon the axis, arched and bearing at its centre two 

 long, divergent spines which are curved downward and slightly inward toward their 

 tips. In the single specimen observed which retains one spine apparently entire, its 

 length is nearly equal to the length of the cephalon. Eye lobes small, inconspicuous. 



