CYPRIDELLA. POLYCOPE. 47 



Size. — 3*5 mm. in length. (Magnified 5 diameters in the figures.) 



Locality. — Lummaton. 



BemarJes. — This obscure little fossil may perhaps be referred to as an analogue 

 of Cypridinella Gummingii, Jones, Kirkby, and Brady,^ which has a much deeper 

 notch, but is otherwise not unlike it. 



3. Genus. — Cypeidella, De Koninch, 1844. 



See Jones and Kirkby, ' Proc. Geol. Assoc.,' vol. ix, p. 499, 1886, for a note 

 upon this genus. 



1. Cypeidella ? sp. Plate IV, figs. 6 a, b h, 6 c. 



Description. — This somewhat obscure specimen reminds us of such forms of 

 Cypridinads as have a subacute posterior margin, well-rounded dorsal and ventral 

 edges, and a bluntly projecting anterior end with an indication of a large notch 

 below. This front margin is much obscured in the specimen under notice by 

 adherent matrix, and we cannot, therefore, be certain as to its generic position. In 

 some respects it resembles in outline some Cyprellx and Gypridellse, but the absence 

 of a tubercle and the uncertainty about its front margin leave the matter doubtful. 

 The valve is in outline sub-rhombic and very convex, especially at the posterior 

 third. The upper and lower edges are slightly turned in, as if overlapped by the 

 other valve. The edge-view of the carapace is ovate ; the end-view oval. A 

 portion of the valve retains indications of a minute, shallow, irregular punctation. 



Locality. — Lummaton. 



Size. — 7 mm. in length. 



II. Family. — PoLYCiopiDiE, Sars. 



1. Genus. — Polycopb, Sars, 1865. 



The small animals belonging to this genus are found living in the Atlantic Ocean, 

 and fossil in the Carboniferous, Devonian, and Silurian strata. As the general 

 result of the examination of the fossils from the localities under notice tends very 

 considerably to reduce the number of species that can be regarded as common to 

 the two latter systems, it is interesting to find one, if not two, of the three Middle 

 Devonian species of this genus occurring also in the Carboniferous Limestone. 

 1 1874, ' Monogr. Brit. Carb. Entom.,' pt. 1 p. 21, pi. ii, fig. 23. 



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