476 CARBONIFEROUS LAMELLIBRANCHIATA. 



Measures, Rosscliff, co. Clare ; South Bank, river Boyne, Drogbeda ; Westown, 

 CO. Dublin. 



Observations. — This species was founded by Mr. Baily on a series of specimens 

 from Rosscliff, co. Clare, and he gave five figures of his shells in the explanation 

 of sheet No. 142, op. supra cit. Most of these specimens are casts of the interior, 

 but a few casts of the exterior are also present. It is probable that these have 

 been crushed, and that the true contour of the valve is not seen, especially the 

 posterior end. Two specimens of C. Footii are in the Manchester Museum, 

 Owens College, in the Kay-Shuttleworth Collection, from the Burnley Coal-field, 

 but the actual horizon is not quoted, and the specimens are by no means good 

 ones. I have not met with the species in any other locality in England. 

 PI. LII, fig. 6, shows certain portions of the hinge-plate as a cast. The plate 

 was evidently much thickened in front, and there are depressions and elevations 

 on it indicating the presence of hinge-teeth, but, unfortunately, they are too 

 indistinct for description. Posteriorly to the umbones the plate is seen, PI. LII, 

 fig. 5 a, to have parallel striations for some little distance along the extreme 

 upper edge, but this part seems to have been remote from that of the opposite 

 valve, because casts show a much deeper groove below the striated portion which 

 corresponded to the actual opposing edge of the hinge. It is possible, therefore, 

 that the striations point to the insertion of the posterior ligament, the more so 

 for the striations are limited only to the upper portion. 



I would point out that Beushausen figures an analogous character in 

 Lunulicardium ventricosum {op. supra cit., pi. xxvii, fig. 3), but he does not 

 seem to have been fortunate enough to observe the interior of any of the species 

 which he referred to Ghaenocardiola. 



