The Trilo'hltcs of the Bokkcveld Beds. 203 



Desciiption of the Species. 



PHACOPS PUPILLUS, sp. nov. 

 Plate XXIV., fig. 1. 



1856. Phacops [CriipJiceus) africaniis, Salter (pars.), Tnins. Geol. 

 Soc, ser. 2, vol. vii., p. 218, pi. xxv., tig. 8 only. 



Head triangular, bluntly pointed in front, surface granulate. 

 Genal angles spinose. Glabella not much more than one-third the 

 width of the head, nearly parallel-sided but widening very slightly 

 in front, produced forward beyond the curve of the cheek ; frontal 

 lobe large, lozenge-shaped. Three pairs of glabellar furrows, all 

 well defined, but the third pair is the deepest ; the front pair is 

 oblique, the others nearly at right angles to the axis. Axial furrows 

 very shallow. Cheeks rather steeply inclined downwards from the 

 glabella. Eyes lost, but seem to have been large, occupying the 

 greater part of the free cheeks, placed close to the glabella. 



Bemarks. — Of this form there is only one specimen, an incomplete 

 head. Salter's fig. 8 (11,288 in the museum of the Geological 

 Society) seems to belong to the same species, the only difference 

 being that in Salter's specimen the first and second glabellar furrows 

 seem to be hardly more than surface markings. This, however, 

 may be due to a different mode of preservation. 



Locality. — Gamka Poort (59).* 



PHACOPS ARBUTEUS, sp. nov. 



Plate XXIV., figs. 2-1. 



Glabella forms an elongated pentagon, widening slightly towards 

 the front and ending forward in a rounded obtuse angle ; it is 

 moderately swollen, covered with tubercles, and is separated from 

 the cheeks by deep furrows. The glabellar furrows are all inclined 

 forwards and are all strongly marked, but the last is somewhat 

 deeper than the rest. The eyes seem to have been small and to 

 have been placed opposite the second glabellar lobe. The occipital 

 furrow is deep and the neck segment bears a strong median spine. 



* The numbers in parentheses given under the head of " Locality " refer to the 

 yellow labels on the specimens. 



