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 
with 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 Messrs. 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. Macrocyrris, G. 8. 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. Macrocypris? pusilla, sp. nov. 
(PLAX V sigs: 10%a5) 62) 
Proportions * :—Length 13. Height 8. Thickness 54. 
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- 
cypris, 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 than obtains in the 
recent Macrocyprides. One other somewhat similar little 
Ostracod (from the Wenlock Limestone, near Malvern) has 
been provisionally referred to this genus, namely J/.? crassulat, 
Jones; but this has very thick valves and is not so reniform 
as the Gothland specimen under notice. 
Macrocypris? pusilla has at first sight a strong resemblance 
Ostracoda from the Lower Silurian (Caradoc series) of Sweden. They 
are from the division termed the Chasmops-limestone (see page 14 of G. 
Lindstrém’s ‘ List of the Fossil Faunas of Sweden: I. Cambrian and Lower 
Silurian’), and appear to be Leperditia Keyserling?, Schmidt, from Kungs 
Norrby, Osterg6tland, and small Z. Keyserdingi, with smaller Leperditia, 
a Beyrichia near B. bussacensis, two Boilie near to those lately described 
and figured by Dr. A. Krause in the Zeitschr. d. D. g. Ges. 1889, p. 13 &e., 
and some other small forms, not determined, from the Westana quarry, 
Ostergétland, 
* If these proportional numbers be divided by 20, the results will be 
the measurements in millimetres and parts of a millimetre. 
+ Ann. & Mag. Nat. Hist. ser. 5, vol. xix. p. 181, pl. vii. fig. 10. 
