214 Annals of the South African Museum. 



with a smooth, narrow, raised lip, which becomes somewhat broader 

 on the posterior lobed margin of the branchiostegite, where, also, it 

 is accompanied by a smooth, hollowed, shallow runnel of the surface. 

 The branchiostegites are ornamented by numerous granules or 

 minute tubercles distributed evenly over their surface. The raised 

 folds of the surface which are situated just dorsally to the oblique 

 branchial furrows are furnished with a row of somewhat stronger 

 granules, besides a few granules irregularly disposed. The region of 

 the carapace situated between the weak sigmoidal grooves (above 

 described) and the cervical suture is ornamented by numerous 

 granules or minute tubercles similar to those on the branchiostegite. 

 The cardiac region, posteriorly to this, is more nearly smooth, 

 showing only a few isolated, weakly developed granules. 



The ambulatory appendages of the thoracic region are known only 

 by a few fragments, and those actually associated with carapaces 

 are too imperfect for accurate description. Portions of a long, 

 slender limb occurring isolated in a nodule from the Sunday's Eiver 

 (the specimen is from the South African Museum collection, and 

 bears the number 663 on a white label) may probably belong to this 

 species. It consists of a portion of a segment of the limb, keeled, 

 with some scattered granular ornaments and bearing a short, 

 distally directed, lateral pointed spur, near the articulation with 

 the succeeding (more terminal) segment. The latter is very 

 slender and elongated and bears several longitudinal tuberculated 

 keels. 



The terga of the first five abdominal segments have a smooth 

 surface and are narrowly and highly arched. The pleura of seg- 

 ments ii.-v. have a flattened or slightly convex form ; they are rela- 

 tively extensive and bear ornaments. The tergum of the first 

 segment is divided across the middle by a well-marked transverse 

 (right and left) groove. The posterior part only of this tergum is 

 prolonged downwards to form a very small pleuron with rounded 

 margin anteriorly, and broadly pointed below. This bears pitted 

 ornamentation and has a transverse carination, the carinal ridge 

 extending forwards from the point of articulation with the tuber- 

 cular facet of the second segment. The surface of the pleuron below 

 the short carina is set at a slight angle to the part above, and is 

 flattened for movement against the posterior lobe of the branchio- 

 stegite. 



The second abdominal segment is relatively broad (antero-posterior 

 measurement), and has very large pleura which bulge forward just 

 below the tubercular articulating facets, and have very extensive 



