Palceozow Fossils. 391 



from, but I identify tlie species with P. callitris^ n. sp. The form 

 is sufiBciently authenticated to warrant a description. 



Body elongated, shuttle-shaped. Head parabolic, margins 

 lost, genal angles produced backwards, with a broad Hat triangular 

 area behind the eyes bearing a raised triangular boss. Glabella 

 prominent, broad behind and tapering forwards, rounded both 

 behind and in front. Sutures not visible. Axial furrows distinct 

 and glabellar furrows faintly pei-ceptible. Eyes very large, elon- 

 gately lunate, the two ends resting against the glabella, with de- 

 pressed semi-circular palpebral lobe projecting away from the 

 glabella and pushing the eye away from it in the centre. 



Thorax with apparently eight segments ; the divisions in the 

 cast are not clearly defined, as the vulcanite has cracked from 

 being kept so long, and a white ])owdery efflorescence has sweated 

 out. Axis bioad, rounded and prominent : pleuraa flattened, with 

 ends strongly recurved, with slight grooves near the ends. 



Pygidium very large, margins lost ; twelve rings can be 

 counted, but more probably existed in the original. Axis elonga- 

 ted conical, yery prominent. Lateral lobes flattened, with some 

 seven or more strong ril)s. 



Remarks.— Allowing for the missing margins and larger 

 size, this si)ecies is very close to, if not identical with, the form I 

 collected at Gamka Poort, figured and described by Lake as Proe- 

 tus inalacusK The differences in the shape of the glabella and 

 pygidium are probably due to the state of preservation in the two 

 specimens, while the resemblances are very striking. The locality, 

 Cockscoml) Mountains, does not convey much information, as 

 Bokkeveld beds occui- on both sides of this range which lies to 

 the west-north-west of Uitenhage. 



Dimensions : Total length, 6.9 cm. Length of glabella, 1.6 cm. 

 Length of thorax, 2.5 cm. Breadth of axis of thorax, 1.7 cm. 

 Breadth of pygidial axis (6th ring), 1.2 x;m. Length of eye, 1 

 cm. Breadth of eye, 4 cm. 



Cat. No. 35. Donor: Dr. W. (4. Atherstone. Locality, Cocks- 

 comb Mountains. 



'Aim. S.A. Mils., Vol. IV., Pt. IV., p. 2Ki PI. XXV., iig. 10. 



