6' 



BRITISH FOSSILS. 



the mucli greater central mucro and more divergent spines, towards 

 which characters we have shown considerable approaches in some of 

 our varieties. It was these close resemblances which induced us to 

 say, in the volume already alluded to, that our British species 

 occurred in Bohemia with the G. insignis. But I find the Bohemian 

 specimens do not show any tendency to vary towards ours. 



Barrande, in his great work which has just been published, 

 figures a fine new species, C. Quenstedti, closely allied to both the 

 above, but the head spines are very much longer and slenderer, 

 and so are those of the tail ; the glabella too is parallel-sided, 

 its furrows run quite across, and the lower pair of lobes nearly 

 meet. Calym, ornata of Dalman, since fully described by Loven, 

 must be very nearly like our species ; but the greatly elongated 

 first pair of spines to the tail, and the parallel-sided glabella must 

 separate it for the present; we subjoin a note giving a few of its 

 prominent characters.* Ch. ohtusicaudatus, Corda, is another nearly 

 allied fossil. 



History. — The history of the species dates clearly, we think, from 

 Hisinger's Lethasa Suecica, where the head of a large specimen is 

 figured, and the species considered identical with the Calymene 

 speciosa of Dalman, found by Nillson in the isle of CEland. There 

 is, however, some doubt of the correctness of this reference. Dalman 

 described in a supplementary note to his " Palseadse " two species, 

 C. speciosa and C, clavifrons, comparing the former with the 

 Trilohites Sternhergii.f This comparison sufficiently indicates that 

 a large species, with the glabella broad in front, must have been 

 intended ; and we lay the more stress on this, because it proves 

 that the species with a small oval glabella, narrowed in front, which 

 was figTired by M. Sars in Oken's Isis, 1835, as G. speciosa of Dalman, 

 is not that species, and could never have suggested the comparison 

 above mentioned. We believe it was this erroneous reference by 

 Sars, joined to Dalman's rather loose description, "smooth, large, 

 oval, and convex glabella,'' which has thrown doubt on the identity 

 of his species with Hisinger's figure. But since there are several 

 species of the genus found in Norway and Sweden, as indicated 

 by the figures of M. Sars, above quoted, and those lately given by 



* GlalDella sequilata ; abdomen articulis 3, basi connatis ; primo secundum longe super- 

 ante, in appendicem crassam teretem longissimam utrinque producto ; secundo tertium 

 excedente, hoc verisimiliter brevissimo. Loc. Husbyfjol, Ostrogothia. Loven in Ofver- 

 sigt Vetenskaps Akad. (1844), p. 64. 



t Sternberg, Verbandl. Vaterlands, Mus. Prag. 11th pt, p. 45. tab. 13 a. Dalman 

 says, that in his species " the glabella lobes are all connected down the middle, "while in 

 Sternberg's they are separated by transverse furrows." 



