52 BRITISH SILURIAN BRACHIOPODA. 
Obs. Prof. M‘Coy identifies the shell under description with Pander’s P. longissima ; 
and it certainly very much resembles M. de Verneuil’s figure of the Russian species. 
Mr. Salter, at p. 267 of his Appendix to Ramsay’s ‘Geology of North Wales,’ unites 
M‘Coy’s P. longissima with his L. ovata. 
Position and Locality. Through the kindness of Mr. H. Seeley, I have been enabled to 
draw the Cambridge Museum specimen described by Prof. M‘Coy, which was found in the 
Bala limestone of Mynydd Fron Frys, five miles west of Chirk, North Wales. Much 
better and larger examples, agreeing still more closely with M. de Verneuil’s figure of 
the Russian shell, were obtained by Mr. D. C. Davies from the Bala shale at Moelydd, in 
Wales, and by Mr. Prosser from beds of the same age at Ketch Bridge, near Llanfyllin. 
In Russia Z. longissima was found by M. de Verneuil at Pavlosk and Baltischport ; while 
Kutorga obtained his specimens at Pulkova. Pander figures only the anterior half of 
the shell. 
(?) Lincuxa optusa, Hall. PI. III, fig. 31. 
Lineuxa optusa, Hall. Pal. New York, vol. i, p. 98, pl. xxx, fig. 7, 1847. 
_ — MCoy. British Pal. Fossils, p. 253, 1852. 
Spec. Char. Broadly ovate, moderately convex at the beaks, flattened towards the 
front, longer than wide, widest anteriorly ; sides slightly convex ; front rounded ; beaks 
obtuse ; surface almost smooth, or marked by a few concentric lines of growth. 
Length (of the Cambridge Museum specimen) 7, width 6 lines. 
Obs. Prof. M‘Coy describes and identifies a single specimen, found in the Llandeilo 
flags (Lower Bala rock) of Llandeilo, Caermarthenshire, with the Z. obtusa of Hall; and 
Mr. H. Seeley has enabled me to figure the specimen so described. I would not, however, 
from the inspection of a single example, venture to assert the identification to be correct : 
the specimen agrees pretty well with Hall’s description and figure, although the beak is 
not quite so obtuse as in the American specimen, which came from the more shelly 
portion of the Trenton limestone of Middleville, Herkimer county. 
(?) Lincuna curta, Conrad. Pl. III, fig. 33. 
LinGu.a curta, Conrad. Journal Nat. Science Phil., vol. viii, p. 266, pl. xv, fig. 12, 1842. 
— — Hall. Pal. New York, vol. i, p. 97, pl. xxx, fig. 6, 1847. 
— — M‘Coy. British Pal. Foss., p. 251, 1852. 
Spec. Char. Very obtusely ovate; sides and front broadly rounded ; beak small and 
acuminate ; valves very slightly convex, or flattened and marked by concentric lines of 
growth. 
Length 5, width 4 lines. 
