212 SUPPLEMENT TO THE 



Gemis — DiNOBOLTJS, Hall, 1871. 

 149. DiNOBOLUs ? HiCKsii. Dav., Sil. Sup., PI. XVI, fig. 19. 



DiNOBOLUs? HiCKsii, Dav. Hicks on the Succ|ssion of the Ancient Rocks in the 

 Vicinity of St, David's, Quart. Journ. Geol. See, 

 vol. xxxi, p. 188, pi. X, fig. 6, 1875. 



Shell marginally transversely oval ; If incli in width, by about 1 inch in length ; very 

 slightly convex, and marked with concentric lines of growth. 



One obscure example of this species was found by Dr. Hicks at Llanvirn Quarry in 

 the Upper Arenig, and was with some uncertainty referred by myself to the genus 

 Dinoholus. It most nearly resembles Dinobohis transversus, Salter, from the Wenlock 

 Shales. If correctly identified, this is the earliest known species of the genus hitherto 

 recorded. The type specimen was presented to me by its discoverer. 



150. DINOBOLUS Davidsoni, Salter. Dav., Sil. Mon., PI. IV, figs. 30—39; Sil. Sup., 



PL XVI, fig. 20. 



I allude to this species once more, to say that a well-preserved example was dis- 

 covered by Mr. W. H. Baily in the Lower Wenlock or Upper Llandovery at LTggool, near 

 Ballaghadereen, County Mayo, and may be seen in the Museum of the Geological 

 Survey of Ireland. 



Genus — Kutorgina, Billings, 1861. 



151. Kutorgina cingulata, Billings. Dav., Sil. Mon., p. 342, PI. L, fig. 25. 



This species continues to be rare. Mr. Salter remarks that it is a very unusual form 

 for the genus ; one valve nearly flat, and with a straight hinge-line ; the smaller valve 

 convex. 



