F. R. Coiqjcr Reed — Undcscrihed Trilohites. 7 



Basal farrows extremely faint. As mentioned above, they are 

 not straight lateral prolongations of the median portion of the 

 occipital furrow, as is the case in many species, but they arise 

 a short distance in front of it on the backward continuation of the 

 anterior lateral furrow, and curve slightly forwards to join the axal 

 furrow nearly at right angles. 



In Salter's original specimen there is in addition to the above 

 furrows a shallow transverse depression arched backwards, extending 

 across the neck of the median lobe at the base of the anterior lateral 

 lobes and between the pits on the anterior furrows. A similar 

 transverse groove is seen in Lichas palmatas (Barr.), L. scaber 

 (Beyr.),' and L. anglicus (Beyr.). 



Occipital furrow composed of a central straight portion, not 

 deeply impressed, and of lateral portions curving strongly backwards 

 and strongly marked behind the basal lobes. 



Fixed cheeks small, with an anterior wing forming a very narrow 

 strip between the axal furrow and the facial suture. At the base 

 of the anterior lateral lobes of the glabella, where the axal furrow 

 bends in, the cheeks increase in width, expanding behind the eye 

 and entering into the general convexity ot the head-shield. 



Eye-lobes of moderate size, prominent, horizontally-extended 

 outwards on a level with the general convexity of the glabella, 

 and situated just in front of the base of the anterior lateral lobes. 

 A short furruw separates them from the fixed cheeks. In front 

 of the glabella is a flattened horizontallj^-extended border of 

 moderate width, widening a little laterally as it passes into that 

 of the free cheeks, and marked off by a shallow marginal furrow. 



Free cheeks triangular in shape, with an inner strongly convex 

 portion abruptly elevated above the flattened broad border, and 

 marked off behind by the occipital furrow and scarcely in front by 

 the very weakly-defined marginal furrow which circumscribes its 

 base and joins the occipital furrow at nearl}'^ a right angle. This 

 inner convex portion of the free cheek bears the eye at its summit, 

 but nearer the front than the anterior border. 



Eye semicircular and prominent, rising up vertically with a high 

 visual surface beneath the overhanging eye-lobe. 



Border of free cheek flattened, rapidly increasing in width from 

 the front to the genal angle, owing to the inward course of the 

 marginal furrow. Genal angles slightly produced into blunt points. 



Ornamentation. — The glabella, occipital ring, fixed cheeks, and 

 the convex portion of the free cheeks are ornamented with tubercles 

 of moderate size, rather sparinglj'^ distributed. On the flattened 

 border of the free cheeks, particularly near the genal angles, there 

 are also a few similar tubercles. 



Thorax.— The thorax in the Fletcher specimen is nearly perfect 

 and shows nine narrow segments, but in Salter's original specimen 

 it is not so well pi'eserved and only seven segments can be dis- 

 tinguished. In each case the specimen has its head and tail strongly 

 bent upwards, and this has caused the body to break across at the 



1 Barrande : Syst. Silur. Bohem., vol. i (18.31), pi. xxix, fig-s. 7 and 24. 



