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Class-ClimTACFA. 
Order— OSmACOBk. 
Section — ENTOMOSTRACA. 
POLYCOPE, G. 0. Sars. 
Polycope simplex, 1\ It. Jones and J. TF. Kirkhy.^ 
PI. XXIV, Pig. 7. 
Cypridinojisis sinipdex, T. R. Jones and J. W. Kirkby, 1871, Trans. Greol. Soc, Glasgow, 
III, Supp]., p. 26. 
Jotycope ,, Idem, 1874, Mon. Brit. Poss. Bivalved Entomostraca Garb. Porm., 
p. 54, pi. 2, fig. 1, 10, 12, and pi. 5, fig. 1. 
Tlie carapace is sliglitly oval, compressed, suLlenticular, and smooth. 
According to the Authors cited above there is a slight marginal thickening at 
the ventral side of some valves. The exterior curve of the gibbosity is very 
variable. Seen sideways the specimens look nearly round, and obliquely 
truncated in the antero-ventral region, and consequently show a slight 
anterior prominence. Seen from the posterior side it appears to be narrowly 
oboval, while seen from the side of the ligament of the valves it shows a 
pointed narrow oval. 
Dimensions. — The transverse diameter of the largest individuals does 
not exceed three millimetres ; the vertical and longitudinal diameters are a 
little smaller. The thickness varies from one and a half to two millimetres. 
Horizon and Localities.— This, species does not seem to be rare. It is 
found in the limestone at Little Island, near Cork ; at Carluke and Campsie, 
in Scotland. More than fifty valves of this species were found in a fragment 
of the Muree Sandstone, about tAventy-five centimetres square. They were 
associated with a small number of the carapaces of the next species. 
' [“■ It is more than pi'obahle that these are the fry of a species of Ap!iama, or even perhaps an Aiiculo- 
pecten.” K. Etheridge, Junr,, Mem. Geol. Survey N. S. Wales, Pal. 5, Pt. 2, 1892, p. 123. — AV.S.D. 
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