LINGULID. 51 
After considerable search Mr. Etheridge found, in the Museum of Practical Geology,! 
Jermyn Street, London, the specimen fig. 36 of our Pl. III, with one of Portlock’s original 
labels, “‘ Zing. brevis,” attached to it. It may be one of the three specimens mentioned 
in that author’s description: it is a little more regularly oval than is Portlock’s figure ; 
his illustration may, perhaps, not be entirely correct. In the Museum of the Geological 
Survey of Ireland a number of small oval Lingule from the Caradoc of Desert- 
creat, Tyrone (Portlock’s locality), agree with the specimen found in the museum at 
London. Other examples from Tramore, Newtown Head, county Waterford, as well as 
from Rathdrum, Wicklow, in the same collection, are similar to those above described, 
and are likewise all labelled Z. brevis. ‘Therefore I think we cannot do better than adopt 
Portlock’s name for the shells defined above; and a series of carefully drawn figures from 
the different localities named will be found in our plate. JZ. drevis approaches sometimes 
in size and appearance to certain examples of Zingula Jole of Billings (‘ Geology of 
Canada,’ Palzeozoic fossils, vol. 1, p. 215, fig. 199) ; but the Canadian shell is more rapidly 
acuminate towards the beak than is Portlock’s species. 
Position and Locality. The Irish specimens are all referable to the Caradoc rocks. 
[Prof. Harkness quotes the same shell from the “Skiddaw Slates”? of Outerside, near 
Keswick, in Cumberland. These, which are the lowest sedimentary rocks of that county, 
have been determined by Salter to include equivalents both of the Lower and Upper 
Llandeilo rocks of Murchison. | 
(?) Lingua toncissima, Pander. PI. III, fig. 28—30. 
LINGULA LoNGIssIMA, Pander. Beitrage der Geognosie des Russischen Reiches, pl. iii, 
fig. 21, 1830. 
_— — De Verneuil. Geology of Russia and the Ural Mountains, vol. ii, 
p. 293, pl. i, fig. 11, 1845. 
— — Kutorga. Dritter Beitrag zur Pal. Russlands, p. 43, pl. vii, fig. 3, 
1846. 
— — M‘Coy. British Pal. Fossils, p. 253, 1852. 
Spec. Char. Almost completely and regularly elongate-oval, much longer than wide ; 
sides moderately convex ; front much rounded; beaks bluntly acuminate ; valves nearly 
equally and very gently convex ; surface almost smooth to the naked eye, but under a 
lens marked with fine concentric lines of growth. ‘Two specimens measured— 
Length 7, width 4, depth 2 lines. 
ea eae 8) 42 lines. 
1 Mr. Salter tells me that all Portlock’s originals are to be found (with the original labels attached) 
in the Museum, London, arranged and ticketed by himself; and that there is an authentic set in the 
Museum at Stephen’s Green, Dublin, 
