ENTOMOCONCHUS. 



51 



subquadrate, with the antero-ventral and postero-dorsal regions slightly prominent. 

 End-view ovate, broadest below. Edge-view long-ovate, broadest behind. 



The transverse, vertical, and longitudinal diameters are as 6^ : 7 : 8. That of the 

 circular depression around the Muscle-spot is as 4^. 



Muscle-spot (seen on the internal cast where the shell is wanting) oval, with about 

 thirty-six radii; it is near the centre of a slightly raised circular area on the cast, corre- 

 sponding with a depression on the inside of the shell, and the edge of which is indicated 

 on the outside of the remaining portion of the shell by a faint curved furrow. 



[These features are not shown on the figure.] 



Figs. 4 a — d. — The shell (grey) of a very large and old individual from Bolland, 

 Yorkshire (Prof. Morris, F.G.S.) ; ths inch in length. Side-view obliquely subovate ; 

 that is, obKquely truncate in front, with antero-dorsal prominence ; and obliquely ellip- 

 tical behind, the postero-dorsal region being depressed. End-view slightly ovate, nearly 

 round. Edge-view oval. 



Transverse, vertical, and longitudinal diameters as 8 : 9 : 10. 



Similar specimens abound in the Carboniferous Limestone of Kildare, Ireland. 



Figs. 5 a — d. — A large dark-grey shell, slightly roughened by weathering, from 

 Bolland (Prof. J. Morris, F.G.S.). It is frds inch in length. Similar occur in Kildare. 

 Side-view suboval, truncate anteriorly, broadly elliptical behind. End-view broadly ovate, 

 almost round. Edge-view subovate, truncate anteriorly. 



Transverse diameter almost equal to the height, and nearly fths of the length. 



Muscle-spot (shown by slight loss of surface) nearly round, with about fifty-two 

 radii. 



Figs. 6 a — c. — A neat little shell of a small, probably young male, specimen, from 

 Bolland (Prof. Morris, F.G.S.). It is Tj^ths inch long; like fig. 4 in shape, but smaller 

 and less globose. 



Diameters — Transverse as 9 ; vertical as 11 ; longitudinal as 13. 



Bntomoconchus Scouleri is known to us by specimens from the Carboniferous Lime- 

 stone of Cork,^ Kildare (see above), Meath,^ and Limerick (collections of Sir R. Griffith, 

 the late Mr. D. Sharpe, Mr. Joseph Wright, British Museum, and Geological Survey, 

 Dublin and London) ; Bolland, Yorkshire (Profs. Phillips and Morris) ; Park Hill, 

 near Longnor, Derbyshire (Geol. Survey, London) ; and Lower Scar Limestone, Settle, 

 Yorkshire (Mr. J. H. Burrow). 



The late Rev. J. G. Cumming quotes it from both the lower and middle stages of the 



1 " It is common in the limestone of Little Island, near Cork, but can rarely be got out perfect." — J. 

 Wright. It is also found at Bally vodock, about two miles south-west of Middleton, Co. Cork, ' Ann. Nat. 

 Hist.,' ser. 3, vol. xviii, p. 48, and 'Explanation of Sheets 187, 195, and 196, &c., Geol. Survey, Ireland,' 

 1864, p. 18 and p. 54. 



2 'Annals Nat. Hist.,' ser. 3, vol. xviii, p. 48. 



