SPH^EREXOCHUS. 79 



work.* The projecting bullate lobes of the glabella, in the Indian fossil, give the aspect 

 of staring eyes, and suggested the terra 8. idiotes. Most of the above-mentioned are 

 apparently, but rare species. The really cosmopolitan fossil is the 8. mirus, which has 

 been found in Bohemia, Sweden, Britain, and North America. 



Localities. — Caradoc Rocks ; Chair of Kildare, Co. Kildare ; Carrickadaggau, 

 Co. Wexford ; Biggar, Lanarkshire (specimens all in Mus. P. Geology). Woolhope 

 Limestone ; Malvern ? Wenlock Limestone and Shale ; Dudley, Walsall, Malvern, 

 abundant. 



Abroad it is found in Lower Silurian strata of Dalecarlia (Hisinger), Upper Silurian 

 of Bohemia (Barrande), and in Ohio, North America. Prom the latter locality I have seen 

 specimens in Sir C. Lyell's collection, and M. de Verneuil also quotes it from thence. 



Sph^erexochtjs ? boops, n. sp. PI. VI, figs. 27, 28. 



Cheirurus clavifrons, M'Coy. Synopsis Pal. Foss. Woodw. Mus., pi. i, f, fig. 12, 



1851 (not the other figures, nor of Dalman, nor Angelin, 

 nor Sars and Boeck). 



I must give this a name, both because of the paucity of British forms of this genus, and 

 to call further attention to it. I had long named it as a distinct species in the Jermyn 

 Street Museum ; and lately I have found, by the correspondence (and a careful drawing) 

 of the talented Mr. Harry Seeley, of Cambridge, that M'Coy 's figure quoted above repre- 

 sents a more complete specimen than the one in Jermyn Street (fig. 27). M'Coy's specimen 

 is correctly represented in fig. 28. There is some doubt of the genus, for it may belong to 

 the section Actinopeltis of the group Cheirurus, but the general character is much that of 

 Splicer exochus, and we do not yet know the limits of these two subgenera, for such they 

 assuredly are. 



I shall content myself with an English description, and only point out its charac- 

 teristics. It is a larger form than 8. mirus. The glabella is of an oblong-ovoid shape, 

 very convex, almost gibbous, but not so greatly so as is that of the Cyrtometopus yibbus, 

 Angelin, a very near ally. 



The basal lobes occupy nearly one half of the length of the glabella ; they are wider 

 than long, and somewhat oblique, — their shape compressed-sphaeroidal, not truly round, and 

 on the inner side they are connected with the body of the glabella by a depressed neck, 

 about half as wide as the width of the lobe itself. The pair of lobes stand apart about as 

 far as their shorter diameter. The neck-furrow is strong, and much arched forwards, 



* The work is yet unpublished. But the plates and descriptions have long been printed. The 

 Trilobites (nine species) are figured in Plate I. Among them is a new type allied to Cheirurus, but with- 

 out eye or facial suture (Prosopiscus, Salter). 



