Paheozoic Bivalved Entomostraca. 409 



1. Primitia ohliquipunctata, sp. nov. 

 (PI. XIII. figs. 1 a, 1 ^>, 1 c.) 



Proportions:— L. 14^. H. 9. Th. 7^ (including 

 the processes 10). 



These rather small carapaces have suboblong valves, straight 

 on the back, boldly curved in front and below, and defined by 

 an elliptical slope on the postero- ventral margin. Much 

 thicker (more convex) behind than in front ; and this feature 

 is enhanced by the presence of a blunt spine on the postero- 

 ventral region, pointing backwards. There is a pit on the 

 middle of the valves, usually rather above the median line. 

 The surface of the valves is ornamented with a delicate punc- 

 tation, in slightly oblique lines, from the antero-ventral region 

 upwards to the dorsal and posterior margins. The little pits 

 are ruled, as it were, by parallel oblique raised lines or slight 

 ridges (see fig. 1 c). There is a slight ventral rim. Edge 

 view of carapace sagittate, the postero-ventral processes 

 forming the barbs. 



Four specimens : — Smith Coll. no. 68. Woolhope. 



V. MoOREA, J. & K., 1867. 



This genus and one species were described by Jones and 

 Holl in the Ann. & Mag. Nat. Hist. ser. 4, vol. iii. (1869), 

 p. 225, and it is the only genus to which the specimen fig. 11 

 on PI. XIII. appears to be referable, though differing con- 

 siderably in some respects as well from M. silurica, loc. cit. 

 pi. XV. figs. 8 a, 8 ^, as from M. obesa and M. tenuis (both 

 from Carboniferous rocks), op. cit. ser. 5, vol. xviii. p. 261, 

 pi. viii. figs. 20 and 21. The raised feature on the new 

 specimen under notice is a median ridge forking at the poste- 

 rior region, and continuing along the posterior margins, so as 

 to give to the ventral edge of the carapace an appearance 

 recognizable also in the other species above mentioned. 



1. Moorea Smithi'i, sp. nov. (PL XIII. figs. 11 a, lib.) 



Proportions:— L. 17. H. 9. Th. 8. 



A neat, ovate-oblong, smooth carapace ; the ends almost 

 equally rounded, but the anterior rather more elliptical and 

 more compressed than the other, which is thick and truncate. 

 A smooth, low, median ridge on each valve divides on the 

 posterior third into two branches. These form the corners at 

 the hinder end of the valve, and one continues round on the 



