GRIFFITHIDES. 39 



16. Grippithidbs brevispinus, E. Woodw., sp. nov. PI. VII, figs. 7, 8. 



Among the various specimens received from Mr. Robert Craig, of Langside, 

 Beith, Ayrshire, N.B., are two fragments of heads of a small species of Trilobite 

 of the genus Griffithides, which, as the discoverer observes, appear to differ from 

 any which have hitherto come under notice from the Carboniferous Limestone. 

 The head is nearly twice as broad as it is long, the free cheek terminating laterally 

 in a short spine ; the eye, which is very smooth, is rounder and more tumid than 

 in other species, and the facets, which are discernible with a Browning's platy- 

 scopic lens, are very minute, and do not break the smooth hyaline surface of the 

 compound eye. 



The glabella is nearly smooth in front, and overhangs the anterior border of 

 the head-shield; the posterior portion of the glabella and the neck-lobe are 

 irregularly tuberculated. The free-cheek is also tuberculated, and has about eight 

 tubercles on each cheek, placed in a semicircle around the compound eyes. The 

 margin of the shield is raised and striated, and has a rather deep and smooth 

 furrrow between the raised border and the inner portion of the free-cheek. 



In the style of its ornamentation this form agrees most nearly with G. longi- 

 sjoinus, Portl., but the head is shorter and broader, and the spines are only one 

 half the length of that species. I have named this species G. brevispinus, H. 

 Woodw. 



Formation. — From the Lower Carboniferous Limestone. 



Locality. — Langside, Beith, Ayrshire. 



From the collection of Mr. Robert Craig, of Langside, Beith, Ayrshire, N.B. 



17. Griffith-ides moriceps, E. Woodw., 1883. PI. VII, figs. 9, 10, 11, 12. 



Geiffithides moeiceps, R. Woodw. Geol. Mag., Dec. ii, vol. x, p. 487, pi. xiii, 



fig. 4, 1883. 



Head-shield semicircular, 22 mm. long and 30 mm. broad ; glabella elevated, 

 very gibbous and obtuse in front, and twice as wide at the anterior border as at 

 the neck-furrow ; basal-lobe small, rounded ; surface of glabella and free-cheeks 

 thickly covered with large round granulations ; facial suture running very close 

 around the glabella ; free-cheeks hatchet-shaped, central part ornamented and 

 raised, bearing the small smooth reniform eyes close to the basal lobe ; border of 



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