The Ahicrioati Geologist. 
Nov.Miili.'i-, lSi)-J 
to III' confouiuk'd with any of our kiiDWii specU's of Li\lnts, Noiu' 
of Iho Europt'aa forms known to nie arc vorv closi'ly n'latinl. 
The specific name is given in honor of Hr. ('. H. Uol)liins.()f W'vkotf. 
Minnesota, an intlefatiiialili' i-oiU'ctor anil student of tlu' fossils of 
•the Lower Silurian localities in southern Minnesota. The (Jalena 
limestones espeeially. have Iuh'u made to furnish an aiiun<lanei' of 
their rich stores of interesting forms through his endeavors. 
Formation and locality: la the middle beds of the Ttalena (Treiueii") 
limestone near Wykoff, Minnesota. 
Lichas i Hoplolichas ^ bicornis. n sp. 
Fig. "2. </, imperfeot cephalic shield, natural si/.e: l>, ])rotile of sanu". 
In this spi'cies the form of the k)l)es of the glal)ella (excluding 
the frontal prolongations), the fixed cheeks and the occipital ring 
.are so mueh like these parts of the preceding speeies that it is 
not necessary to descril)e them. I shall therefore merely point out 
the most striking ditferences between the two sp(>cies. 
Ill ihc lirst })hiee the antei'ior part of the central lolic of the 
glalti'lla is not drawn out into a single haculatc prolongation, but 
sup|)orts two much smaller divi'rging horn-like j)rocesses. each 
1..") mm. in diameter and jirohalily less than Iti mm. in length. 
The dorsal surfaces of the three longitudinal lobes of tlu' glabella 
Are more convex transversely, and tlu' lati'ral ones a little more 
elongate (the length is scarcely gn-atcr than twice the width). 
Finally then- is a slight dilfcrence in the papillose marking of the 
test, the large set of papilhe In'ing more prominent in L. hicm-nis. 
The two frontal horn-iiki' processi's will distinguish dus species 
.at once from all known American species of Lichda. 
Formation and locality: Upper beds of the Cincinnati group near 
Spring Valley, Minnesota. 
