LINGULID. 37 
black, and its small reticulated fragments have been found in several places about 
Llandeilo.” 
Prof. M‘Coy gives us also a good description of this shell, and adds that the obtuse 
tuberculation is distinctly visible to the naked eye in good lights, and completely distin- 
guishes this species from LZ. tenuigranulata of M‘Coy ; but, on the other hand, it appears 
to be identical with that of Z. cancellata, Kutorga, from the Pulkowa limestone (‘ Ueber 
das Sil. und Dev. Schicht.-Syst., von Gatschina ;’ ‘ Verhandlungen der Russ. Kaiserl. 
Min. Gesellschaft zu St.-Petersburg,’ for 1845, t. vii, p. 119, fig. 5), from which species, 
however, its great width and straight front seem to distinguish it perfectly. 
Position and Locahty. ‘This species has been hitherto found only in the Llandeilo and 
Caradoc beds. Prof. Phillips obtained if in the Llandeilo District, at Llandeilo; North 
west of Gwenllwyn; also at Tre Gib; and in the Haverfordwest District at Mydrim and 
Lann Mill. Prof. M‘Coy states it to be common in the Bala limestone of Llandeilo, 
Carmarthenshire; but this is an error, according to Mr. Salter, Z. ovata having been 
taken for it. ‘I'he largest specimen I have seen is in the possession of Mr. G. H. Morton, 
of Liverpool. 
Lingua Tenuieranusata, ‘Coy. PI. II, figs. 9—14. 
LINGULA TENUIGRANULATA, M‘Coy. Ann. Mag. Nat. Hist., 2nd series, vol. viii., p. 
406, 1851; and British Pal. Foss., p. 254, pl. 1, fig. 8, 
1852. 
—_ a Salter. Siluria, p. 212, fig. 5, 1859. 
Spec. Char. Shell large, semi-elliptical, longer than wide ; lateral margins nearly straight 
and parallel, but the shell is somewhat broader anteriorly than posteriorly ; front margin 
nearly straight or slightly convex, the anterior angles abruptly rounded, posterior margin 
forming rather abrupt slopes uniting in the middle so as to form very obtusely pointed 
beaks, but the extremity of the beak of the ventral valve is somewhat more elongated and 
pointed than that of the ventral one; valves almost equally and moderately convex, 
flattened along the middle. Exterior surface finely imbricated, or closely covered with 
minute radiating, raised, granulate strie, with interspaces between them, a little wider 
than the width of the interrupted ridge, the tubercules near the beaks and margins being 
almost detached, and forming a linear succession of small elevated granules or elongated 
drops. ‘The shell and ridges are also crossed by minute, concentric, slightly undulating, 
elevated lines. Two specimens measured— 
Length 22, width 14, depth 9 lines. 
MLD. Cry LOS... 5n, 1A se 
Obs. This fine species has been very well described by Prof. M‘Coy, who also mentions 
that it is distinguishable from Z. granulata, Phillips, by the extremely minute granular 
