246 
CONULAEIA QUADEISULCATA, Miller. 
PI. XXIII, Pig. 3. 
A. curious fossil, D. Ure, 1793, Hist. Rutherglen, p. 330, pi. 20, fig. 7. 
Conulcirict qucidrisulcuta, Miller, 1821, in J. Sowerby’s Min. Conch., Ill, p. 107, pi. 260, 
fig. 3, 4, and 5 (non idem Sowerby, in Murchison’s Silurian 
System, nec Hisinger). 
,, ,, J. de Carle Sowerby, 1834, Trans. Geol. Soc. London, V (2), p. 
492, pi. 40, fig. 2. 
5 , ,, P. McCoy, 1844, Synop. Carb. Poss. Ireland, p. 26. 
,, tuheri-COStci, G-. Sandberger, 1847, Neues Jahrb. liir Min , p. 21, pi. 1, fig. 12. 
,, quadrisulccitci, P. McCoy, 1855, Brit. Pal. Poss., p. 528. 
,5 ,5 P. Koemer, 1874, Letha^a Geogu., Atlas, pi. 45, fig. 5. 
This shell is rhomhoidal in cross section, and of medium size, its small 
sides differing little from the large sides. The angles are occupied by a 
shallow and rather narrow furrow, in which the transverse ribs of the surface 
end alternately. Between two ribs on each side of the furrow there is a very 
short and regularly alternate small transverse jirotnherance, which I can only 
compare to a narrow band, furnished on both sides with small alternate teeth. 
The sides are flat, and covered with numerous transverse folds, a little more 
closely packed towards the upper extremity than elsewhere. These folds are 
nearly continnons, or only slightly interrupted in the centre, arched, convex 
from the side of the opening, and often grannlose ; the farrows sejiarating 
them are broader than the folds themselves. In good sj)ecimens, with a lens, 
one can see irregular transverse strire at the bottom of these furrows. 
Dimensions. — The incomplete specimen I have described is only twenty- 
three millimetres long. The apical angle of the large size is 20°. Towards 
the middle of its length there are twenty-four folds for each ten millimetres 
of length. 
Delations and Differences . — On account of the rarity of most species 
of Conularia, and the difficulty of procuring authentic specimens for com- 
parison, this species has often been confused with others most unlike it. 
Sowerby confuses it with a Silurian species lately dedicated to him by 
Def ranee. I think, with Verneuil and McCoy, that the name C. quadrisiil- 
cata should he strictly reserved for the s^oecies to which Miller gave the 
