22 



CARBONIFEROUS ENTOMOSTRACA. 



a greater or less extent at the antero-ventral region, Cypridina Zdandica is the nearest recent 

 type, and Cypridinella Cummingii is one of the most symmetrical and least exaggerated 

 at the lower portion of the front, among the fossils ; thus it more closely approximates to 

 the said recent species than several of its associates in the Carboniferous Limestone, 

 which become almost grotesque in the prow-like character of the front, as in naval rams, 

 like the " Merrimac " and " Monitor." Thus they belong to a peculiar group, separate from 

 Cypridina proper; indeed, the exact generic place of the recent type above mentioned 

 has not been determined, for it was characterised by its carapace alone, before the 

 study of the limbs had been carried to as great a nicety as naturalists now find necessary. 



Two casts, somewhat ferruginous (one rather smaller than the figured specimen), 

 occur in dark grey limestone, with Encrinites and small Shells, from Poolvash, Isle of 

 Man, collected by the late Rev. J. G. Gumming, and presented by him to the Museum of 

 the Geological Survey, London (Tablet -^5-). 



The late Mr. Gumming courteously informed us by letter (January 27th, 1864) that 

 he regarded his Cyjmdina ovalis, from the Upper or Poolvash Limestone^ (see ' The 

 Isle of Man,' 1848, p. 355), found with other Entomostraca, referred to as Cythere 

 PJiillipsiana, De Koninck, Cypridina annulata, De Kon., and Baphnia primceva (?), 

 M'Goy, in the same work, at pp. xxiv, 355, as being most probably the same as 

 C. primceva (M'Coy). 



In specimens of this same limestone, kindly sent to us by Mr. E. W. Binney, E.R.S., 

 we have met with a valve, not well exposed, of Cypridina primava (?), and an im- 

 perfectly preserved valve of a small compressed Entomoconchus. 



2. Cypridinella superciliosa. Sp. nov. Plate II, figs. 7 a — c; Plate V, figs, la — d. 



Carapace-valves convex, broad-oval or subovate ; indented in front, above the middle, 

 with a deep, narrow notch, slanting upwards, and bordered by a distinct marginal rim. 

 The lower portion of the front of the figured specimen is partly imbedded and not fully 

 exhibited in fig. la ; but it stands out with a bold though variable curve in specimens 

 from Settle and Bathgate. The ventral margin is bordered by a furrow and a rim in a 

 large valve from" Bathgate (PL V, fig. 7). Edge- and end-view are both sharp-ovate, the 

 former the longer. 



From Cork. Length 1: height i; thickness \ inch. Proportions 11 : 8i : 7. 



From Bathgate. Length \; height -^; thickness ^ inch. Proportions 12 : 10 : 8. 



Cypridinella superciliosa is less convex and rounder in side-view than C. ovalis ; and 



its deep-cut and neatly bordered or rimmed notch is a good distinction. It has been 



^ Equivalent to the lower portion of the Mountain-limestone. 



