Wyatt-Edgell—On a New Species of Lichas, ]63 



The axis of the tail (which, at the anterior margin, is about 

 three-fourths the breadth of the sides,) is remarkably flat for the 

 greater part of its length : posteriorily it rises to a boss, which 

 must have been nearly equidistant from the extremity and the 

 anterior edge of the tail. 



The axal furrows converge (so as to form, if produced, an 

 angle of 25°) as far as this boss ; they are slightly curved round 

 it, and then disappear. From each of these, at one-fourth and 

 one-half its length, respectively, branch two deep sinuous furrows, 

 which are curved backwards, the second more so than the first, 

 to the outer margin. There are also less deep secondary furrows, 

 of which the first pair have a wavy course from the anterior corners 

 of the axis to the outer extremities of the nearest primary furrow ; 

 the second pair are similar to them ; "the broad ribs contained 

 between the first primary furrows and the anterior margin are 

 produced into short flattened spines, similar to L. Barrandii ; 

 probably it was the same with the posterior pair of these ribs, 

 there is a short and shallow furrow diverging from each side of 

 the axis, near its extremity ; the rest of the tail, from this point 

 to the posterior margin is flat, merely covered with the mixed 

 granulation observable also on the head. No specimen that I have 

 seen shows the extremity of the tail. 



The labrum is a slightly granular and deeply furrowed plate, 

 having two broad and flat auricles posteriorly ; the anterior corners 

 being rectangular, and the margin between them gently curved. 

 There is a broad central lobe to the labrum, encircled by a furrow 

 which terminates both ways at the anterior margin, this lobe having 

 on either side a deep indentation. 



Of British species Lichas patriarchus most resembles the L. sub- 

 propinqua of McCoy, but the elongate outline and short axis of the 

 latter show it at once to be different. 



From most of the SM'-edish Lichades it is distinguished by the in- 

 completeness of the first pair of glabella furrows ; from L. convexus, 

 Angelin, which resembles it in that particular, by its truncate outline, 

 and by the eyes being placed lower down. The elongate form of 

 all the parts of L. cicatricosus, Loven, and the triangular outline of 

 the tail of L. laciniatus distinguish directly these two sjpecies from 

 ours. 



I have made these comparisons with Swedish species at the desire 

 of Mr. Salter, who considers them necessary on account of the great 

 similarity of forms in the group to which L. patriarchus belongs. 

 LicJias pacJiyrhinus, Dalm., or L. convexus may be taken as its 

 type.i 



There is no Bohemian Lichas which bears much resemblance to 



See Angelin's Palaeontologia Suecica. 



