BRITISH FOSSILS. 



7 



Localities. — In Bala Rocks, Pwllheli, Carnarvonshire ; Mathyrafal Wood, Mont- 

 gomeryshire ; also Westmoreland and South Wales. In Upper Caradoc Sandstone, 

 var. /3, May Hill and Tortworth, Gloucestershire, in great abundance, first observed 

 at the latter place by T. Weaver, Esq. ; Bogmine, Shelve ; in the " Pentamerus 

 Limestone" of the Hollies, and of Buildwas, Shropshire, abundant. In Wen- 

 lock Shale ; Var. a. Woolhope. In Wenlock Limestone ; Dudley, Walsall. In 

 Upper Ludlow Rocks ; Billiards Barn, Woolhope. Ludlow Rocks of Marloes 

 Bay, Pembrokeshire, var. ^. 



Foreign Localities. — Sweden, Norway, Russia, in Lower Silurian ; Gottland, in Upper 

 SUarian. pi_j^J,/3,jJ^. 



3. E. variolaris, Brongn. st^/^ Calymene, Brongn. (1822), Crust. Poss. t 1. f. 3 B. (not 

 A.) Parkinson, Org. Rem., iii. pi. 17. f. 16. Murchison, Sil. Syst. (1839), pi. 14. f. 1. 

 mala, (not of Emmr.) Salter, Mem. Geol. Surv. (June 1848), vol. ii. p. 1. 344. 

 Pletcher, 1850, Quart. Geol. Joum., vol vi. pi. 32. f. 6-10. Zethiis, M'Coy (1851), Pal. 

 Poss. Woodw. Mus. p. 157. 



JS. ovatuSf obtusus, sesquiuncialis, capite et thorace E. punctato simiUimis, sed glabella 

 injlatd, nee antice tuberculis in serie transversa dispositis, genis per totum tuberculatisy 

 angulis rotundatis; hypostomate basi convexo ; thorace axi inermi, pleuris rugoso-tuberculatis ; 

 Cauda convexd brevi trigono, axi convexo pauci-annulato^ annulis subcequalibus 9-12 inter' 

 ruptis et in tuberculos varie disposiios insectis, lateribus costis 7, deflexis, scepe tuberculatis ; 

 apice abrupto deflexo. 



Professor Burmeister in the supplement to his valuable work (ed. 2. p. 115), pointed 

 out the obvious discrepancy between the two figures referred by Brongniart to his 

 Cal. variolaris, and in a great measure set the synonyms right. But he was 

 wrong in quoting the figures in the Bridgwater Treatise and Emmrich's description 

 as for this species, which has obtuse and rounded, not spinose angles to the head. 

 The characters of the tail are amply sufficient to separate the two common species ; 

 and I may add that those of the head, even if the angles are broken, are also well 

 marked, the glabella of E. variolaris being inflated and equally clothed with large 

 tubercles, whence the name " Strawberryheaded Trilobite ;" while in E. punctatus 

 it is convex, but not inflated, and in front has the tubercles distinctly gathered 

 into a tranverse series or crest, a character more marked in our next species. 

 There should be no more confusion as to the names, since the publication of 

 Mr. Fletcher's figures and description quoted above. 



Localities. — Wenlock Limestone and Shale. Dormington Wood, Woolhope j Dudley 

 and Walsall (abundant) 



4. E. multisegmentatus, Portl. sp. Amphion, Portlock, G. Rep., pi. 3. fig. 6 (too many 

 side ribs.) Ampyx baccatus, id. (head), fig. 11. E. multisegm.f Emmr. (1845), Neues 

 Jahrb., p. 43. 



E. sesquiuncialis, depressus ? glabella valde clavatd, ad basin angusta, tuberculosa, a 

 genis convexis profunde separata ; tuberculis magnis anterius in cristam transversam arcu- 

 atam collocatis; genarum tuberculis (nisi duobus maxiniis),minoribus, caudd longe triangulatd, 

 apice acuto nec producto dejiexo, axi angusto annulis numerosis circiter 30, solum prope 

 apicem obliteratis ; lateribus 12-costatis, costis arcuatis deflexis. 



The crest of large tubercles, parted in the middle, along the front of the glabella, as 

 well as the numerous ribs of the tail, are good marks of this elegant species. There 

 can be no doubt the two portions above cited belong to each other. 

 Localities Lower Silurian [head and tail], Tyrone j Montgomeryshire [tail only]. 



J. W. Salter. 



August, 1853. 



