724 ME. J. E. HAJIE AND DE. H. A. NICHOLSON 



Glabella almost circular, marked by a small pair of basal lobes 

 extending over the fixed cheek as shallow depressions, which are 

 stated by Barrande to characterize the genus. Eyes minute ; no 

 visible trace of an ocular ridge. The cheeks and limb are marked 

 by a venose arrangement of narrow ridges, seen enlarged in fig. 14 a. 

 Axis of body wide, pleurae straight for the greater part, but slightly 

 recurved at the extremities, marked by shallow, straight grooves. 



This differs from all the Bohemian forms. It is near to H. 

 Wegelini, Aug., but the glabella is broader, and the venose structure 

 of the cheeks and limb is not shown in the figure of the Swedish 

 species. 



Our specimens have been subjected to so much pressure that the 

 original structure is much obscured. 



Hor. ^ Loc. Zones of Phacojps glaber and Ampyoc aloniensis, Skel- 

 gill, and in the latter zone at BrowgiU. 



Hakpes ANGusTtrs, n. sp. (PL XVI. figs. 15, 16, 16 a.) 



Head semioval, surrounded by a broad convex fringe, somewhat 

 squared in fi^ont, extending backward towards the extremity of the 

 body, where it terminates in a tolerably sharp point. 



Glabella semicylindrical, reaching two thirds of the distance be- 

 tween the neck-furrow and the fringe, the space in front of it being 

 occupied by a prominent tubercle, A furrow appears to occur on 

 each side of the glabella, separating off a small basal lobe, which is 

 not visible from above, being situate entirely upon the nearly per- 

 pendicular side. No depression is seen to extend from this on to 

 the cheek. Ej'e small, situate near the anterior end of the glabella. 

 Ocular ridge not shown. Cheeks and limb punctate, the puncta 

 sometimes occurring in tolerably regular lines, and thus originating 

 a venose structure, which is less prominent than in the last-described 

 species. 



About fifteen body- rings preserved in one specimen ; axis very 

 narrow and convex. Pleurae nearly four times the width of the 

 axis, almost straight throughout, and with a shallow groove. Tail 

 unknown. 



This is a much narrower form than the last, from which it diflfers 

 in other particulars, so that it seems improbable that we have here 

 merely differences of sex. 



Ilo7\ 6f Loc. Zones of Phacops glaber and Ampycc aloniensis, 

 Skelgill. 



Ampyx (Ehaphiophorus) aloniensis, n. sp. (PL XVI. fig. 17.) 



Length, exclusive of spines, ^ inch. 



Head broader than long ; glabella trapeziform, produced in front 

 into a slender spine. Neck-segment very narrow. A pair of basal 

 furrows, nearly parallel with the neck-furrow, produce a pair of well- 

 defined though small basal lobes. Indications of a second pair of 

 furrows running obliquely downward may be accidental. Posterior 

 angle produced into a long spine, about | inch long. 



Body-rings badly preserved, four only seen ; tbe pleurae twice the 

 width of the rings of the axis, marked by straight furrows 



