The Trilohites of the BoJd-cvcId Beds. 217 



markings, but this is probably, as Dr. Woodward ''■ has suggested to 

 me, a parasite, perhaps of the nature of Ischadites. What I take to 

 be the eye is small and situated at the bend of the facial suture. 



The thoracic segments, of which there are several fragments, 

 were large and deeply grooved, the posterior ridge being wider and 

 more prominent than the anterior, and bearing a raised eminence, 

 from which spring strong spines. The articular facets were large. 



The species is evidently very closely allied to H. herschcli, and 

 the restoration of the head in PI. XXVIII. is based on a comparison 

 with the head of that species. 



Locality. — Uitkomst, in the Warm Bokkeveld, Ceres Division. 



HOMALONOTUS, sp. 

 Plate XXVII., fig. 2. 

 From Ezelfontein, Ceres, there is a fragment of a very large tail 

 which bears numerous large tubercles or spines. It is at once dis- 

 tinguished from H. licrschcU by its flattened form, and seems, 

 indeed, to have been as depressed as in the species of Homcdonotus 

 which occur in the Silurian. 



Localitij. — Ezelfontein, Ceres (23) ; specimen 25, locality unknown, 

 possibly belongs to this species. 



Note. — It may be remarked that L. de Koninck (Bidl. Acad. Boy. 

 Belg., vol. xiii., pt. 2, pp. 419, 420, footnote) records Homcdonotus 

 licrscheli, H. kuighti, and Ccdymene blumenbachi from the Cedar 

 Mountains ; and d'Archiac and de Verneuil {Trans. Geol. Soc, ser. 2, 

 vol. vi., p. 381) also note H. herschcli, G. tristam, and C. blumen- 

 hachi from the same region. Salter, however {Trans. Geol. Sac, 

 ser. 2, vol. vii., p. 219), remarks that the specimen identified by 

 d'Archiac and de Verneuil as G. blumcnhachi is the original of his 

 fig. 9 (see above, p. 207), and that the reference to G. tristani is 

 probably based upon distorted specimens of Bhacops africanus or 

 P. caffer. De Koninck's identification of H. Iniiijliti must also be 

 considered doubtful. 



* I am greatly indebted to Dr. Woodward for examining this specimen, and also 

 my specimens of Fliacops arhnteu^. 



17 



