36 CARBONIFEROUS TRILOBITES. 



ohsoletus (given in 1836), which has since figured as a synonym ; but as Fischer 

 de Waldheim expressly says in his work,^ already quoted in reference to two 

 pygidia of Trilobites named by him, Asaphus Eichwaldi and A. Bro7ign{arti, *' I 

 think that size alone is not sufficient to make two species ; I consider them as one 

 and the same species, for which I have retained the name of Eichwald, the more 

 so as another Trilobite already bears the name of Brongniart." It seems, there- 

 fore, clearly undesirable to revive a specific name which its author had already 

 cancelled, and to apply it to a form which certainly cannot be correlated with that 

 originally intended to be described under the defunct term. 



14. G-RiFFiTHiDES LONGispiNus, PoHloch, 1843. PI. VII, figs. 5 a, by c, and 6. 



Geiffithides LONGISPINUS, Portlock. Geol. Rept. Lond., p. 312, pi. xxlv, fig. 12, 



1843. 



— — irCoy. Carb. Foss. Irel.,p. 161, 1844. 



— XONGICEPS, Morris. Cat. Brit. Foss., p. 109, 1854. 



— — Salter and H. Woodtuood. Cat. and Chart Brit. Foss. 



Crust., p. 10, fig. 115, 1865. 

 Phulipsia — V. von Mdller. Trilob. der Steinkohl., pp. 19 and 73, 



1867. 

 Griffithides — , a. Woodward. Cat. Brit. Foss. Crust., p. 37, 1877. 



General form elongated-oval ; head wider than long ; glabella very gibbous in 

 front, slightly overhanging the anterior border, much broader in front than behind 

 the eyes ; basal lobes small, rounded ; neck-lobe strongly arched, narrow, divided 

 from the glabella by a deep neck-furrow ; fixed cheeks narrow, where they pass 

 from the posterior border and above the eyes, forming the small, rounded, 

 palpebral lobes, after which they expand again slightly on each side of the glabella 

 before the facial suture unites with the front border ; surface of glabella thinly and 

 irregularly tuberculated ; free cheeks small, elevated, channelled around the eye 

 and the border, the small area so enclosed covered with numerous, rather coarse, 

 and irregular bead-like ornamentations ; eyes reniform, moderately small, smooth ; 

 margin of cheeks produced into rather long cheek-spines (" long, flat, striated 

 spines." Portlock") ; margin of head-shield incurved and finely striated. Thoracic 

 segments nine in number, axis strongly arched, each segment having a narrow 

 elevated central rib, ornamented with about twelve small tubercles or spines, with 

 a smooth anterior articular portion and a less elevated posterior border; the 

 pleurae are strongly grooved, and are bent down at the fulcral point, their 



1 * Oryc. Gouv. Moscou,' p. 121. 



^ There is reason to conclude that one of these spines existed when Portlock wrote his descrip- 

 tion, although it is only now indicated by a fragment and by the scar where it once rested. 



