214 Annals of tlie South African Museum. 



flattened on the top. Axial furrows almost obsolete and glabellar 

 furrows indistinct or absent. Facial suture seems to have cut both 

 anterior and posterior margins near to the glabella. Eyes lunate, 

 closely appressed to the glabella. 



Thorax shows seven segments, but at least one appears to be 

 missing. Axis prominent, much wider than the pleurae in the first 

 few segments, but narrows considerably behind while the width of 

 the thorax remains nearly the same. Pleura3 bent downwards at 

 about half their length from the axis, grooved by broad shallow 

 grooves which do not reach the extremity, ends produced into 

 points. 



Tail large, triangular, width about one and a half times the 

 length. Axis conical, prominent, with some thirteen or fourteen 

 rings upon it, of which the first half dozen are much stronger and 

 more widely separated than the rest ; the end of the axis just 

 touches the margin. Lateral lobes with seven concave furrows 

 separating rounded ribs, the last rib being very small ; ribs and 

 furrows reach the margin. 



licmarks. — Dr. A. Schenck '■■ records " Praetus " (sic.) ricardi from 

 the Bokkeveld Beds, but does not appear to have published any 

 description or figure of the species. 



Localities. — Gamka Poort (45, 53) ; Ceres (60). 



HOMALONOTUS HEESCHELI, Murch. 



Plate XXVL, figs. 1-3. 



1839. Homalonotus hcrschclii, Murchison, Silurian System, p. 652, 



pi. vii. bis, fig. 2. 

 1856. Homalonotus hcrschclii, Salter, Trans. Geol. Soc, ser. 2, 



vol. vii., p. 215, pi. xxiv., figs. 1-7. 

 1897. Hovtalonolus perarmatiis, Freeh., Lethaea geognostica, Th. 1., 



Bd. ii., Lief. 1., p. 218. 



The specimens of this species are not more perfect than those 

 which Salter had at his disposal, and it is not possible to add any- 

 thing of importance to his description. 



The head is somewhat triangular in shape, produced in front into 

 a prominent curved beak ; surface finely granulate. The glabella is 

 urceolate, widest at the base, contracted in the middle, and expand- 



* Petenu. Mitt., bd. xxxiv., ISSS, p. 2-27. 



