268 Prof. T. R. Jones on the 



The specimens are mostly delicate calcareous representa- 

 tives of the bivalve carapaces. The forms are so very similar 

 among themselves that it is difficult to arrive at conclusions 

 M'itli certainty as to their exact alliances ; but rather than 

 leave them unrecorded and unarranged in any serial order, I 

 venture to refer them, as cautiously as possible, to such 

 generic and specific types as we are acquainted with. In the 

 collections made in and about Shropshire by JMessrs. J. Smith 

 and G. R. Vine, and described in the Ann. & Mag. Nat. 

 Hist, already alluded to, are to be found the best known of 

 these types. 



I. Macrocypris, G. S. Brady, 1867. 



In these Cypridiform species the left is smaller than the 

 right valve of the carapace. See Ann. &. Mag. Nat. Hist. 

 March 1887, p. 178. 



1. Macrocyprisl pusiUa. sp. nov. 



Macrocypris ? i^usiUa^ sp. 

 (PI. XV. figs. 10 a, h.) 



Proportions * : — Length 13. Height 8. Thickness b\. 



Taking the narrowest (lowest) and most compressed end 

 for the anterior, we see that the right valve of this carapace 

 strongly overlaps the other. This character is seen in Macro- 

 cyiiris, though the general shape of the carapace in the fossil 

 is not that usually met with in the genus, and though the 

 overlap is stronger all round the valve tlian obtains in the 

 recent Macrocy prides. One other somewhat similar little 

 Ostracod (from the Wenlock Limestone, near Malvern) has 

 been provisionally referred to this genus, namely M. ? crassula'\j 

 Jones 5 but this has very thick valves and is not so reniforra 

 as the Gothland specimen under notice. 



Macrocypris'^ pasilla has at first sight a strong resemblance 



Ostracoda from the Lower Silurian (Caradoc series) of Sweden. They 

 are from the division termed the C/iasmcps-limestoue (see page 14 of G. 

 Lindstrom's ' List of the Fossil Faunas of Sweden : I. Cambrian and Lower 

 Silurian '), and appear to be Leperditia Kci/serUiif/i, Schmidt, from Kungs 

 Norrby, Ostergotland, and small L. Keyscrluu/i, with smaller LeperditicB, 

 a Beyrichia near B. bussacensis, two Bo/lice near to those lately described 

 and iigured by Dr. A. Krause in the Zeitschr. d. D. g. Ges. 188L>, p. l.j &c., 

 and some other small forms, not determined, from the WestauS quarry, 

 Ostergotland. 



* If these proportional numbers be divided by 20, the results will be 

 the measurements in millimetres and parts of a millimetre. 



t Ann. & Mag. Nat. Hist. ser. 5, vol. xix. p. 181, pi. vii. hg. 10. 



