Yol. 65.] CARBONIFEROUS LIMESTONE OP COTJNIY CLARE. 571 



In conclusion, I wish to offer my sincere thanks to all those who 

 have given me their help in the preparation of this paper. To 

 Dr. Yaughan I owe a deep debt of gratitude for his continuous 

 encouragement and invaluable advice, and for permission to study 

 his collection of Avonian fossils. 



I have to thank Dr. Bather, for naming crinoids ; Dr. Wheelton 

 Hind, for help in regard to some of the lamellibranchs ; and 

 Mr. B. G. Carruthers, for naming several of my corals. My thanks 

 are also due to Mr. Woods, for assistance in finding M'Coy's type- 

 specimens in the Sedgwick Museum at Cambridge ; to Prof. Gren- 

 ville Cole, for permission to examine the 6-inch MS. Geological 

 Survey maps of the county; and to Prof. Sollas and Prof. Garwood, 

 for several helpful suggestions during the course of my work. 



I am much indebted to Mr. E. B. Lloyd, for his assistance and 

 companionship in the field during the summer of 1907 ; and to 

 Mr. C. J. Bayzand, for the map (fig. 3, p. 543) showing the outcrop 

 of the limestone. 



YIIL Pal^lontological Notes. 



(A) Brachiopods. 



Dielasina. 



DlELASMA HASTATUM (Sow.). 



British examples of the genus Dielasma are exceedingly numerous 

 and varied, and a systematic study of the group would no doubt 

 tend to separate forms now included under the specific name of 

 Dielasma hastatum into a number of distinct species. The Belgian 

 shells were studied in detail by L. G. de Koninck, who figured 

 and described no less than thirty-two species. 1 Sowerby's original 

 type-specimen, figured in his ' Mineral Conchology,' was obtained 

 from Limerick, and without doubt came from the Syringoihyris 

 Zone. Identically similar forms are common in this zone in County 

 Clare. It would be outside the limits of this paper to give a 

 detailed account of the different forms of Dielasma found in this 

 area, but a few well-marked types seem to demand reference. 



1, Dielasma aff. Hngi (de Kon.), PI. XXVI, fig. 3. This shell 

 bears a close resemblance to Dielasma Jcingi, de Kon., figured in 

 Ann. Mus. Boy. Hist. Nat. Belg. pi. ii, figs. 36-37 & pi. iv, figs. 

 14-15. It agrees with this species in the relative dimensions of 

 length to breadth, which are much less than in D. hastatum, and 

 in the thick truncated anterior margin, which is only very slightly 

 indented. The sinus in the ventral valve is shallow, though well 

 marked, and confined to the anterior portion of the shell. The dorsal 

 valve is flattened or feebly convex, and does not possess a sinus. 

 The nearest approach to this form, figured by Davidson in his 



1 Ann. Mus. Eoy. Hist. Nat, Belg. vol. xiv, 1887. 



