345 



May not the workers of the Cotteswold Club, keep an 

 expectant eye upon it ? ''^ 



Next, the large Liassic species of Tancredia, (Lycett, 1850) of 

 which the French possess so many, are now beginning to come to 

 light. Referring to the 2nd. Edition of Morris (Brit. Fossils, 

 1854), all inserted in his list of the genus are Oolitic; not a 

 single species from our Liassic older beds : now one species in 

 particular — the rare T. liassica, (Etheridge) was found in the 

 Lower Lias by the Eev. J. E. Cross, in Lincolnshire (" On the 

 Geol. of N. W. Lincolnshire," Q. J. Geol. Soc. May, 1875); and 

 by myself a little while before, in the Margaritatus-Zone of the 

 Middle Lias, at Churchdown. Further, the subject of this paper, 

 the Plicatula Icevigata of the Normandy and the Rhone Basin 

 deposits, being yielded by the Cotteswold Lias, points to the 

 same conclusion. Not to mention several new species of 

 Brachiopoda common to both series, the evidence does not 

 culminate in the mollusca ; witness the singular little crinoid, 

 so frequent in the Calvados; the Cotylederma, cited by 

 QuENSTEDT as occurring at Aselfingen : by Deslongchamps, at 

 Mays : and by Terqtjem, along the Moselle, and now found by 

 F. D. LoNGE, F.G.S., in the south-west of England, at 

 Down ClifF; and tersely described by our Vice-President, Dr. 

 Wright, in the Geol. Mag. (Oct. 1875) 



These facts are cited as examples that sufficiently indicate 

 the drift and significancy of the accession of new fossil forms of 

 a common kindred, that were formerly regarded as ahens to 

 our Liassic fauna. 



The description, representation, and other particulars of the 

 P. Icevigata that follow, are given for the purpose of enabling 

 observers to recognize this new species, by a knowledge of its 



* My remark has been anticipated as far as the Tancredia Lugdunen.ns is 

 concerned ; for Jlr. E. B. Tawney, the Curator of the Bristol Museum, tells me 

 that in the Museum Collection there is a specimen of it labelled " T. Lugdunrmis, 

 Dumbleton," in the handwriting of my friend Mr. Etheridge. So that we 

 may, it seems, already claim it as our own. This singular instance should 

 stimulate the Members of our Society to keep a sharp look-out in the Cotteswold 

 Lias for other examples of this Rhone species. 



