Notes on PalcBOzoic Entoniostraca. 339 



and rare, this form occurs in a considerable number, and with the 

 test well preserved ; but unfortunately no one of the specimens yet 

 met with has the whole margin of either valve quite exposed for 

 examination ; and only one specimen with the valves in juxta- 

 position has been found. Mr. G-. F. Whidborne, F.Gr.S., of Torquay, 

 has discovered twenty-eight individuals of this species in the Middle- 

 Devonian Limestone of Lummaton quarry, a quarter of a mile north 

 of Mai-ychurch, which is on a hill about two miles north of Torquay. 

 The bluish-grey limestone is in some parts made up of Shells. 

 Polyzoans, Encrinites, etc., with a noticeable proportion (in the 

 hand-specimens) of the organisms under notice. 



It is a Cypridinad, having strongly convex valves, elongate-oval 

 in form, and with a short transverse (vertical) sulcus at or near the 

 middle of the ventral region. The closed carapace is subcylindrical, 

 rather acute in front, and rounded behind. The dorsal edge of the 

 left overlaps that of the right valve. The beak at the middle of the 

 anterior margin is distinct, though not large, as in Figs. 2 and 3. 

 It is formed, as it were, by a slight, but definite, lateral pinching of 

 the middle of the front end of the two valves, rather than by a notch 

 cut out of their curved and projecting end. 



The antero-ventral margin of each valve turns sharply inwards 

 and upwards to a slight extent, and has a feeble marginal hem 

 (exaggerated in Fig. 3&, by local distortion). An antero-ventral 

 longitudinal furrow is thus caiised in the closed carapace, continuous 

 with the antennal notch. The ventral margins appear to meet 

 without overlap. 



The dorsal margin of the right valve is somewhat flattened or 

 bevelled along the hinge-region, with a slight beading where it turns 

 off from the convexity of the valve, and against which the edge of 

 the overlapping valve rests. None of the figured specimens shows 

 this feature well, but the marginal hem continued from the aforesaid 

 angle is shown in Fig. 5c. 



The short vertical ventral depression or furrow is a distinctive 

 feature, as important as the dorsal furrow in Cijpridella, and, although 

 not always strongly expressed, it is too persistent to be accidental. 

 The muscle-spot, neatly radiate, is seen in several specimens (for 

 instance. Fig. 2a), near the middle of the valve (but rather backward), 

 at the upward termination of the sulcus crossing its ventral region. 



The other organisms constituting the hand-specimens of Lumma- 

 ton limestone in which I have seen the Cyprosina are : — 



Airypa aspera. 

 Athyris ? 

 Spirifera nuda ? 

 Leptmna caperata. 

 Cypricardia. 



Glauconome bipinnata ? 

 Fenestella prisca ? 

 Aulopora ? 

 Coral (obscure). 

 Encrinital joints. 



Mr. Whidborne favours me with the following note on the fossils 

 which he has collected in the limestone of Lummaton quarry. 

 " Some of the most noticeable are : — 



Brontes Jlabellifer. I Hexacrmns tnferscapularis. 



Fhacops latifrons, \ Euomphalus annulatus. 



