ASAPHUS. 167 



Locality. — Caradoc. Lower shale, under the sandstones of Horderly, Shropshire, 

 (discovered by Mr. A. Marston, and now in Mr. H. Wyatt Edgell's cabinet). 



AsAPHUS (Basilicus?) radiatus, Salter. PI. XVIII, figs. 1 — 5. 



Ogygia radiata, Salter. Appendix to Kay edition of Burmeister, Org. Tril., p. 125, 



1846 (and quoted by M'Coy), 

 IsoTELUS (Basilicus) laticostatus, M'Coy, in part. Synopsis Woodwardian Fossils, 



pi. i E, fig. 18 (not fig. 18 a, or of Green), 1853. 

 AsAPHUS RADIATUS, Salter. App. Ramsay, Geol. N. Wales ; Mem. Geol. Surv., vol. iii, 

 p. 311, pi. xxiii, fig. 7, 1866. 



A. suhplanus, 7 — 8 tincias longus ?, obtuse ovatus, axe angusto, capite latissimo, glabella 

 distinctd. Thorax brevis diniidium caudce efficiens. Cauda semicircularis lata, axe angusto 

 abbreviato ^-annulato, vix per | caudce producto, apice prominulo ; limbo utrinque costis 

 7 — 8 abbreviatis tumidis radiato. Sulci aquales, recti, subsinuosi. Margo anticus valde 

 sinuosus. Superficies striis obliquis striata, perornata ; fascia interna latissima, lineis 

 remotis rugosa. 



This elegant and common species has not yet attracted much attention ; the first 

 specimen, found at Bala by myself in a pleasant summer's work with Prof. Sedgwick in 

 1844, was without much doubt referred to Ogygia in the MS. catalogue of British forms 

 supplied to the Ray edition of Burmeister^ by myself. A hasty field-note had previously 

 assigned our fig. 2 to the 0. Buchii, a species which does not occur in North Wales. 



Prof. M'Coy supposed he could identify this, and another different species, with the 

 cast published by Green. It is quite certain they are not the same, and, indeed, that fossil 

 is a Phacops (see note, page 158). And though I do not admit his strong criticism as to 

 the generic name I first gave it, for Ogygia has often simple furrows, it is more likely an 

 Asaphus, of the group Basilicus, or of that to which A. nobilis of Bohemia belongs. 



M'Coy describes the entire form as " obtusely oval ; the cephalic shield rounded, 

 about three times as wide as long, the thorax shorter than the head — only a little more 

 than half the length of the tail — of eight slender segments ; its axis rather less than two 

 thirds the width of the pleurse, which are nearly straight, slightly bent downwards and 

 backwards; the tail nearly semicircular, length more than half the width, and one third" 

 (it is nearly twice) "longer than the thorax." The rest of his description applies to the 

 A. laticostatus (fig. 6), and not to our species. 



I may add that the glabella is widest in front, and the head with a distinct margin ; 

 the neck-segment narrow, but strong. The pleurae well grooved throughout. The tail 

 has a curiously sinuated front margin, the outer portion at the angle almost forming a 



1 A most inaccurate edition it is, especially in the introductory portion, tlie German terms being 

 misundcrstuod by the translator. Burmeister's descriptions are intelligible enougli in the original. 



