358 Prof. T. R. Jones on the 
XXXVI.—Notes on the Paleozoic Bivalved Entomostraca.— 
No. XV. A Carboniferous Primitia from South Devon. By 
Professor T. Rupert Jones, F.R.S., F.G.S. 
In June last Mr. J. E. Lee, F.G.S., of Torquay, having 
discovered two casts of small Entomostraca in the red schist of 
the Lower Culm-measures of South Devon, sent them to me for 
examination. He had found one of the few patches of Culm- 
stone left by denudation in that region at Lord Clifford’s 
farm, Waddon-Barton ; and before the place was bricked up 
he removed a cart-load of the stone to his own residence. It 
proved to contain Orthoceras striolatum and Goniatites, with 
a small Pecten, Posidonomya (rare), Cylindraspis (also rare), 
and the two little fossils here referred to. ‘These interesting 
specimens are two internal casts of one species of Primitia, 
lying at nearly a right angle one to another, on a roughish 
bed-plane of hard, purplish-red, schistose mud-stone. ‘They 
have suffered somewhat from lateral pressure. One (fig. 1), 
2°5 millim. long, has heen probably rather shortened ; and 
Casts of a Primitia from the Lower Culm of South Devon. 
Fig. 1 a.—Internal cast of a right valve; possibly somewhat shortened 
by pressure. 
Fig. 1 6.—Edge view of the same, showing the posterior convexity. 
Fig. 2.—Internal cast of a right valve, much elongated by pressure. 
All magnified 5 diameters. 
the other (fig. 2), 3 millim., has decidedly been length- 
ened and attenuated by the squeeze to which the rock has 
been subjected since the imbedding of the organisms. The 
figures represent them magnified five diameters. 
Some obscure traces of other fossils, and many minute 
cavities due to the former presence of organic remains, occur 
on the same rough bed-plane which bears the two casts. 
Many similar little holes, along nearly regular lines, parallel 
with that plane and with the schistose structure, are visible 
on a face of fracture perpendicular to the bed-plane of the old 
mud-stone. 
