PHACOPS. 43 



P. (C/iasmops) granulatus, capite antice truncato, oculis maximis subdepressis, plewis 

 obtu$is,fulcro ab axe valde remoto. Cauda axe \%-annulato angusto, costis lateralibus 

 14 — 16. apice emarginato. 



An obtusely ovate form, strongly truncate in front, and obtusely pointed behind. The 

 head widely transverse, fully two and a half times as wide as long, and with the glabella so 

 expanded along the front as to occupy more than half the width of the head, and over- 

 hang the middle of the large eyes. Thence the glabella abruptly narrows to half this 

 width, sloping inwards to the base of the middle lobe ; but from this point it is again parallel- 

 sided to the base (in P. macroura the shape is triangular, here it is turbinate). 



The upper glabella-lobes are quite overhung by the frontal lobe, and are not greatly 

 larger than the succeeding lobes. They are right-angled triangles, with the obtuse right 

 angle outwards, not inwards as in the preceding species. The space between them is fully 

 equal to the width of the lobes themselves; their length is two thirds that of the great eye. 

 The middle lobes are rather smaller, narrower, and somewhat linear, but tumid at the 

 sides — (and not overhung and rendered obsolete as in P. macroura). The basal lobes are 

 still narrower, more linear, and less tumid ; the neck-lobe of the same shape as the basal 

 lobes. The whole glabella, as well as the cheeks, and all the rest of the head is thickly 

 covered with large granulose tubercles. 



The cheeks are not large, and are chiefly occupied by the semilunar eyes, which reach 

 from the front furrows nearly to the neck-furrow. They are much curved, the eye-lobe 

 strongly margined, with an angular fold along the middle. Cheek-spines large. 



Axis of the body-rings gradually widening behind ; rather convex, especially along the 

 middle part, which is wholly covered with granules. The sides of the axis are nodose on 

 every joint. The axal furrows strong, the pleurae not very much wider than the axis, flat 

 as far as the remote fulcrum, which is fully two thirds out. Pleural groove deep, very 

 oblique, and leaving a strong node on the proximal or inner end of the pleura, against 

 the axis. This is a conspicuous character. Tubercles, larger and smaller ones, are visible 

 over the whole surface. Tail broadly half-ovate, convex, but regularly so, except the con- 

 cave narrow margin. The axis not very prominent nor strongly separated from the sides, 

 tapering, narrow, with straight sides, composed of eighteen rings nodular (as the axis of 

 the body, but on a smaller scale). Sides of tail depressed, with fourteen or sixteen 

 flattened radiating ribs, with a somewhat sigmoid curve ; the ribs separated by sharp 

 furrows which run almost to the margin. The ribs are granular throughout ; there is an 

 imperfect double row of granules on each flattened rib — the space between the rows 

 representing the interlining furrow, which is not present in this species. 



The apex of the tail is, as in most of the allied forms, emarginate and a little raised ; 

 a ridge runs to it from the angular termination of the axis, as in kindred species. 



The labrum or epistoma, fig. 15, has the wide arched base characteristic of the sub- 

 genus. It is gently convex and somewhat angular in form (but subparallel at the base) 

 with a shallow notch for the ascending process. The concentric pair of furrows are deep ; 



