404 



The striee are crossed by mimerous narrow lines of growth, 

 which give the shell a reticulated appearance." 



The Macrourous Crustacea contributed hitherto by the Spinatus 

 sands at Churchdown, include some examples just perfect 

 enough to be determined generically, but not in each case 

 specifically. They are referable to the genera Eryma (Meyek), 

 Glyphea (Meter), and Pseudoglyphea (Oppel). 



Of the Pseudoglyphea sp. I possess part of a shell or carapace, 

 and a fragment of a claw, which were kindly named by Mr. H. 

 WOODWAKD, F.R.S. 



It would seem that many of these forms appear in the Lias 

 and run persistently through the Jurassic series, and singular 

 enough a great many of them agree in identity with species 

 found only in the lithographic stone of Solenhofen in Bavaria. 

 Mr. H. Woodward has remarked, "The persistency of such 

 forms as Eryon, Eryma, and Glyphea seems clearly to demonstrate 

 that having escaped total extinction in the Lower Lias sea, they 

 must have migrated from time to time to more favourable areas, 

 and thus have been enabled to live on, during the deposition of 

 the long series of sedimentary deposits, up to the period of the 

 deposition of the lithographic stone in which so many examples 

 are found fossil." 



The Count Gaston de Saporta, who has devoted special study 

 to the fossil algse, kindly communicates the following remarks 

 on one of the Churchdown specimens from the Spinatus Zone. 

 " Votre fossile me parait etre une Algue comparable a celles 

 nommees Palseophycus, par Hall, et dont Schimper donne ainsi 

 la diagnose: Trons simplex vel ramosa, cylindrica vel sub- 

 cylindrica, hinc inde articulata ' — cette definition s'applique bien 

 a votre fossile dont les ramifications paraissent avoir ete 

 articule^s 5a et la. Les Palseophycus de Hall sont Devonien ; 

 mais les types d'algue palseozoique ont persiste en grand partie 

 pendant toute la periode secondaire ou Ton remarque les 

 correspondances suivantes : — 



(Jurassique) 

 (Jurassique) 

 (Jurassique) 



Spiropliyton (Devonien) 



Paleeopliycus vii-gatus (Devonien) 

 ButrotrepMs (ex parte Devonien) 



Camellophycus 



Siphonites 



Chondrites 



