CYCLOPYGB SUBARMATA. 21 



furrows; anterior pair situated rather behind middle of glabclhi ; posterior pair 

 about half way between anterior pair and base of glabella ; small median tubercle 

 situated close to base of glabella ; general surface of glabella ornamented with fine 

 undulating broken lines transverse near base but concentric to lateral margins at 

 sides and extending on to base of frontal spine. Palpebral lobes formed by 

 whole of narrow, flat, depressed, band-like fixed cheeks embracing sides of glabella, 

 widening a little at base with distinct neck furrow marking off narrow pleuro- 

 occipital ring. Eyes very large, swollen, bulging out, with convex surfaces, 

 embracing sides of head-shield and extending forwards to tip of frontal spine, 

 which separates them above, but confluent on lower surface and completely bound- 

 ing epistome in front, narrowing posteriorly to its lateral angles ; lenses alternating, 

 arranged in regular straight rows parallel to axis of body in median part but 

 radiating slightly at sides ; 20 — 30 lenses in median rows on lower surface ; in 

 lateral rows lenses decrease in size to base of glabella. 



■Epistome (= rostral shield) triangular, subcrescentic, obtusely pointed in 

 front, anterior edges nearly straight and meeting in middle at angle of 120° to 

 130°; widest across middle ; narrowing to lateral angles ; posterior edge concave 

 forwards; surface flat, marked by few transverse lamellose strice, arching simply 

 forwards without angulation. Doublure of head-shield behind lateral extremities 

 of epistome very narrow, somewhat bent back, with lamellose strias from epistome 

 continued on to it. 



Thorax of six segments. Axis wide, tapering posteriorly to about two-thirds 

 its anterior width ; axial rings simple, ornamented with fine, parallel, slightly 

 sinuous lines ; first ring with small median tubercle; third ring Avitli median pair 

 of circular pits. Axial furrows weak. Pleurge increasing in length to pygidium ; 

 first pleurae very short, broad, with prominent knob on front edge fitting into 

 notch at end of axial furrow of head-shield, and provided with long, tapering, 

 straight spines sharply bent back and reaching to pygidium, touching or overlapping 

 extremities of successive pleurae, being closely pressed against sides of thorax ; 

 second and successive pleurge with truncate ends and short recurved subfalcate 

 points ; each pleura with strong diagonal furrow on surface and a few fine lines 

 along its length. 



Pygidium semi-circular, with broad, somewhat flattened border ; axis conical, 

 short, a little more than half length of pygidium, composed of two or three rings 

 and a triangular terminal piece ; extremity pointed and connected with marginal 

 furrow by fine groove. Lateral lobes gently convex, with one strong wide deep 

 groove just behind and parallel to anterior margin, and two or three faint pleurae 

 corresponding to axial rings and indicated by fine 'Straight radiating interpleural 

 furrows dying out before reaching marginal furrow, each with finer line parallel 

 to and a short distance behind the interpleural furrow. Pygidium ornamented 

 by fine transverse sinuous lines on axis continued on to pleural lobes. 



