58 Field Museum of Natural History — Geology, Vol. IV. 



Family LICHADID^, Barrande. 

 Genus AMPHILICHAS Raymond 1905. 

 (Platymetopus* Angelin 1854, Paralichas Reed 1902.) 



By combining the various characters enumerated in previous de- 

 scriptions this genus may be described as follows: 



Cephalon broadly sub triangular, tuberculate. Anterior lobe of the 

 glabella dominating the other lobes, and continuous with the axis; a 

 single pair of lateral glabella furrows opening directly into the occipital 

 furrow; no third lobes; all lobes depressed convex, all furrows narrow; 

 dorsal furrows concave inward ; occipital ring forming a band. Pygidium 

 with two rings on the axis; post -axial piece not defined posteriorly; 

 three pairs of pleurae, each with pleural furrow and free point ; third pair 

 incompletely defined from post-axial piece, points short and blunt. 



Amphilichas rhinoceros sp. nov. Plate XV, Figs. 5-6. 



Type specimen No. P 11 181 Field Museum. 



Glabella large, occupying nearly the entire width of the cranidium, 

 depressed convex posteriorly, inflated in front, subpentangular in out- 

 line, rounded anteriorly, greatest width just in front of the eyes; the 

 single pair of glabella furrows originates on the lateral margins, curves 

 gently inward and backward for about half the length of the glabella, 

 thence backward subparallel until they join the occipital furrow. 

 They thus divide the glabella into a median and two lateral lobes. 

 Median lobe broad in front, posterior half only slightly convex, anterior 

 half abruptly inflated, length about two and one-half times the width at 

 the occipital furrow. Lateral lobes undivided, margins subparallel, 

 width about equal to that of the median lobe, moderately convex except 

 in front where they bend outward and downward to the lateral margins; 

 greatest elevation near the dorsal furrows in line with the palpebral 

 lobes, where large nodes rise abruptly from the dorsal furrows but else- 

 where gradually ; these nodes form the bases of the two, long, lateral spines. 

 The occipital segment forms a wide, depressed, transverse band, widest 

 in the middle and gradually narrowing towards the dorsal furrows; 

 posterior margin slightly concave, with a well developed doublure. 

 Dorsal furrows, as well as glabella and occipital furrows, narrow but 

 well defined. Fixed cheeks small, depressed, convex, aside from the 

 palpebral lobes, which rise abruptly; the only portion of the palpebral 



*Platymetopus Angelin, 1854, preoccupied by Dejean, 1829, for genus of Coleop- 

 tera. Paralichas Reed, 1902, suggested in its place, preoccupied by White, 1859, 

 also for Coleoptera. 



