GRIFFITHIDES. 29 



Hypostome broad and short, wings not distinct from central lobe ; obliquely 

 striated, free extremity rounded and emarginated. 



The subjoined is Phillips' description of Asaphus (Griffithides) seminiferus :^ 



" Head poroso-granulated, mesial lobe bisulcate on the sides, and bitubercu- 

 lated at the base ; abdomen with tumid lobes ; ribs roughened, with eight or ten 

 unequal prominent subglobose puncta ; limb not striated. The first segment of 

 the middle lobe mucronate. 



Formation. — " Rotten Stone " Band ; Carboniferous Limestone. 



Locality. — Matlock, Derbyshire ; Settle, Yorkshire ; and Blackrock, near Cork. 



9. Griffithides globiceps, Phillips, sp., 1836. PI. VI, figs. 1, 3, 4, 5, 6. 



Asaphus globiceps, Phillips. Geol. Torks., vol. ii, p. 240, pi. xxii, figs. 16 — 20, 



1836. 

 Geiffithides globiceps, Portlock. Eept. Geol. Londonderry, p. 311, t. xi, figs. 



9 a, b, 1843. 

 PniLLiPsiA globiceps, De Koninch. Anim. Toss. Terr. Carb. Belgique, p. 599, 



tab. liii, fig. 1, 1844. 

 Geiffithides globiceps. It Coy. Synopsis Carb. Foss. Ireland, p. 160, 1844. 



— — Oldham. Journ. Geol. Soc. Dublin, vol. iii, pt. 3, p. 188, 



pi. 2. 1846. 



— -^ Morris. Cat. Brit. Foss., p. 109, 1854. 



— — Baiter Sf Woodw. Cat. and Chart Foss. Crust., p. 16, 



fig. 117, 1865. 



— — S. Woodio. Cat. Brit. Foss. Crust., p. 37, 1877. 



General form ovate-oblong : head elevated, glabella very gibbous, overhanging 

 the anterior border of shield, contracting rapidly to about half the width behind, 

 where it unites with the neck-lobe ; basal lobes prominent, triangular, to which 

 the eyes seem to be united without the intervention of the fixed cheek ; but there 

 is a very narrow border united to the glabella forming the palpebral lobes which 

 join the lateral lobes, or nearly so ; neck-lobe narrow, axis strongly arched ; lateral 

 portion crossed by cheek-suture obliquely ; eyes very small but exceedingly promi- 

 nent ; cheeks very narrow and compressed, ending in short, blunt spines ; margin 

 of head striated longitudinally ; eyes very minutely faceted ; thoracic segments 

 nine in number, strongly trilobed ; axis wider than the pleuras ; the posterior 

 portion of each segment strongly corrugated, and each pleural groove extending 

 rather beyond the fulcral point ; the extremity of each pleura is rounded and 

 broadly faceted : pygidium rounded, consisting of eleven coalesced somites, which 

 in the axis continue the corrugated character of the thorax, but diminish to a 

 1 See ' Geol. York.,' 1836, vol. ii, p. 240, pi. xxii, figs. 8, 9, 10. 



