%$6 MR. E. S. COBBOLD ON TRILOBITES [Aug. I 9 II > 



Paradoxides rugulostts Corda. (PL XXIV, figs. 14-16 c.) 



I. Havvle & A. J. C. Corda, ' Prodr. M'onogr. Bohm. Trilob.' 1847, p. 32. 

 J. Barrande, ' Syst. Silur. Boheme ' vol. i (1852) p. 374, pi. ix, fig. 31 & pi. xiii, 

 figs. 3-9, and Suppl. 1872, p. 11, pi. iii, fig. 36. 



This species is represented by a number of cranidia and other 

 fragments, usually in the state of very friable casts in rottenstone. 

 These are in accord with Barrande's figures and descriptions in all 

 points, except that the rugosities on the anterior lobe and sides of 

 the glabella appear to be more strongly pronounced (see PI. XXIV, 

 figs. 15 a & 15 6). 



I was so much impressed with these rugosities, that I sent the 

 specimen figured to Dr. G. P. Matthew, with the inquiry whether 

 it was related at all closely to the Acadian P. lamellatus Hartt. 

 He very kindly replied that the rugosities of the Shropshire form 

 differ from those of P. lamellatus in being ' shorter, lower, and 

 more numerous.' 



Tho pygidium (figs. 16 a-lQ c) appears to me to be of the same 

 form as those from Bohemia. Dr. Matthew adds that a complete 

 oranidium, of which I sent him a drawing, ' is a very good 

 eteminicus or rugnlosus,' but that the pygidium is not like that of 

 the Acadian P. eteminicus. 



Locality and horizon. — Excavation Xo. 23 in a field near 

 the upper section on the Shoot-Bough lioad, Comley ; from a cal- 

 careous band at the summit of the Shoot-Pough-Poad Sandstone, 

 about 14 feet below the band which yielded Paradoxides davidis 

 and the associated brachiopoda. 



Conocoryphe Corda. 



CoxocoRYrHE emargiistata Linnarsson, var. longifrons, nov. 

 (PL XXIV, figs. 8-13.) 



J. G. 0. Linnarsson, 1876-77, Geo!. Foren. Stockholm Forhandl. vol. iii, p. 366, 

 & pi. xv, figs. 2 a-4. 



In my collection there are fragments of several head-shields of a 

 trilobite, which seems nearly allied to Linnarsson's species from 

 Stora Pro, but whether it should be regarded as a local variety or 

 as a distinct species, must depend upon the weight given to the 

 several divergences, which are as follows : — 



(1) The Comley cranidia are longer, more convex, and more 

 quadrate in outline than the Scandinavian form. In the former 

 the facial sutures converge but gently forwards, whereas in the 

 latter they are inclined at a considerable angle to the axial line. 



(2) The glabellas from Comley are long, strongly elevated and 

 somewhat campanulate in outline, and have only very faint traces 

 of the lateral furrows, whereas Linnarsson's fig. 2 a shows a com- 

 paratively-short, conical glabella with well-marked furrows. 



(3) The marginal rim (and concurrently the intramarginal 

 furrow) of the Comley form varies somewhat. In some specimens 

 (PI. XXIV, fig. 12 a) it is only just marked off by a change of 

 curvature, in others (fig. 13) it is separated from the rest of the 



