14 
D’Orpieny, 86 in number, so that it seemed to stand alone, and 
to indicate a new departure from the then existing types. 
With few exceptions the different species were confined to 
particular zones, but the beds occurred in patches, so that the 
fossils were only exposed in a few localities. The questions 
had been asked how and whence did these curious shells come ? 
The first question was very difficult to answer; but as regards 
the second, it might be said that they appeared about the same 
period in various localities in England, but much later in the 
Continental areas of the Oolites. An earlier form had been 
described by the late Cuartes Moors from the Marlstone at 
Ilminster, but Mr Wrrcnrrt having been enabled to examine 
specimens procured from Banbury, pointed out differences in 
structure between these and the true Nerinea, and considered 
that Moorn’s species was not a Nerinea, but a Cerithiwm. 
Considering that the genus when it first appeared was repre- 
sented by several species, he thought that there must be other 
areas, not yet discovered, where the Nerinea lived, and which 
contained beds not known in England or north-western Europe. 
Professor Harxer then read a paper on the probable early 
extinction of a Cotteswold butterfly (Lycena Arion). As it was 
within the knowledge of Lepidopterists that this, one of our 
rarest British species, was likely to become extinct, and as it 
was formerly one of the specialties of the Cotteswolds, he 
thought that a short account of it might prove acceptable. 
There are in Hurope some 48 or 50 species of “ Blues,” though 
only some eight or nine are found in this country. Of these the 
largest, though not the most brilliantly coloured, was the large 
Blue, Lycena Arion, which was from an inch and a quarter to 
an inch and a half in expanse of wing, of a rich deep smalt 
blue, with black dashes. Within the memory of many it was 
to be met with over a considerable area of the Cotteswold 
escarpment. Those who were familiar with the butterfly, and 
were in the habit of visiting the localities in which it occurred, 
had remarked upon its increasing rarity, until of late years a 
long period had elapsed without the species being seen at all. 
It had been stated by Mr Maxrpen that in 1870 so freely did it 
