CALYMENE BLUMENBACHI. L33 



Pygidium narrow, a little more than half the length of thorax ; axis long, 

 conical, consisting of 10 — 12 rings, of which only the first 7 — 8 are distinct. 

 Axial furrows narrow. Lateral lobes composed of only two pairs of pleura?, in 

 contact for short distance and corresponding with first two rings of axis. First 

 pair resembling thoracic pleura?, curved backwards strongly, nearly parallel with 

 axis, with long, free, slightly curved, pointed ends. Second pair closely pressed 

 against sides of axis and meeting behind it, to end in short free points, making a 

 bifurcate extremity to the pygidium. 

 Dimensions. — 



Length of head-shield . . . 5"5 mm. 



Width „ . . . 10-0 „ 



Width of glabella at base . . .2*5 ., 



Length of thorax .... 6*5 ,, 

 Length of pygidium .... 4*0 ,, 

 Affinities. — This species is closely allied to D. frederici-a-ugusti, Corda, 1 as 

 Nicholson and Etheridge have pointed out. The Swedish species D. ornata, 

 Linnarsson, 2 is perhaps as closely related, and it possesses the tubercle or spine 

 on the fourth axial ring of the thorax. The only other British species of Dindy- 

 mene (D. hughesiae, Reynolds 3 ) differs in the relatively larger head, distinctive 

 ornamentation, characters of the pygidium, and absence of genal spines. 



The specimen figured by Nicholson and Etheridge as ' Staurocephalus ? sp. ind.' 

 (op. cit,, fasc. iii, 1880, p. 283, pi. xix, fig. 3) seems to be an imperfect example 

 of D. cordai. 



Collection,— Mrs. Gray (f. M.). 



Horizon and Localities. — Whitehouse Group (M. Bala) : Whitehouse Bay. 

 Drummuck Group (U. Bala) : Thraive Glen ; Drummuck. 



Family Calymenida:. 

 Genus CALYMENE, Brongniart, 



1. Calymene blumenbachi, Brongniart, 1822. Plate XVII, figs. 12, 13 (?). 



1750. A Nondescript Petrified Insect, Lyttelton, Phil. Trans., vol. xlvi, pp. 598, 600, pi. i, figs. 



3—12 ; pi. ii. 

 1759. Entomolithits paradoxus, Linnaeus, Act. Soc. Sci. Holm., p. 22, pi. i, fig. 3. 



1 Barrande, ' Syst. Silur. Bolieme,' vol. i, p. 818, pi. xliii, figs. 25, 26. 

 3 Linnarsson, ' Vestergotl. Camb. Silur. Anagr.,' p. 64, pi. i, figs. 15 — 17. 



3 Keynolds, ' Geol. Mag.' [4], vol. i (1894), p. 108, pi. iv, figs. 1, 5 ; Reed, ibid., p. 246, pi. vii, 

 figs. 4, 5. 



