588 
gible the various observations on the anticlinals of South 
Craven which are scattered over his Essay on the Mountain 
Limestone of Yorkshire. I wish also to express the very- 
great satisfaction with which I have witnessed the revival of 
this Society as a Geological Association. I believe that 
several years have passed since a purely geological paper was 
last read before its members. To-day we see indications of a 
change for the better, in the mere announcement of three 
papers on local geology. I hope it may be long before this 
Society finds itself obliged again to confess that none of its 
members have any investigations to report, while so many 
phenomena still remain unexamined and so many problems 
unsolved in the hills of our own magnificent county. 
ON SACOCARIS: A NEW GENUS OF PHYLLOPODA FROM THE 
LINGULA FLAGS. BY J. W. SALTER, A.L.S., F.G.S. 
Seldom, indeed, do we meet with Crustacea of any great 
size in the very old rocks, unless these be members of the 
Trilobite order. Of these, indeed, the largest forms are the 
oldest of all, for no Trilobite approaches the size of the giant 
Paradoxides, which characterize the Menevian group — the 
oldest fossil group with which we are acquainted — for, in 
spite of all that has been said and done, JEozoon has not passed 
beyond the mythical stage. Some of its admirers regard it at 
least with sup>erstitious reverence. But into the positive stage 
it has not entered ; and, therefore, the Menevian group, 
proposed by Dr. Hicks and myself for Britain, and recog- 
nized abroad, is the oldest known. JSTo Crustacea, except a 
few small Bivalve Phyllopods (Leper ditia) , are known to 
accompany the trilobites in it. But when we ascend to the 
next overlying group — the true Lingula flag or Pfestrinog 
group of Sedgwick, while the trilobites reduce their size, a large 
