PINNOCARIS. 117 



name it after our friend Mr. W. Carruthers, F.E-.S., who gave much attention to 

 the Moffat fossils. In the table appended to his paper Dr. Lapworth refers his 

 figs. 24 a and b to the Lower Llandovery beds of Tieveshilly near Portaferry, 

 and Coal-pit Bay, county Down, North-east Ireland.^ 



The late Mr. M. Dairon quoted the object of his fig. 29 from Dobbs Linn, near 

 Moffat. 



5. Peltocaeis ? Haeknessi, Salter, 1863. 



Peltocaeis ? Haeknessi, Salter. Quart. Journ. Geol. Soc, vol. xix, 1863, p. 89, 



fig. 2 (woodcut). 



— — Biffsbi/. Thesaur. Silur., 1868, p. 76. 



— — T. B. J. and S. W. Geol. jNIag., 1884. p. 355. 



— — — Eeport Brit. Assoc, 1884 (1885), 



pp. 76 and 94. 



— — Etheridge. Foss. Brit., vol. i, Palseoz., 1888, p. 62. 



Shape indeterminate ; it may be a piece of any large Phyllopod ? species : the 

 author was uncertain as to its alliance. Graptolitic beds (of Llandeilo age), 

 Dumfriesshire. 



XI. Genus Pinnocaeis, B. Etheridge, jun., 1878. 



E. EiHEEiDGE, jun., ' Proceed. Eoy. Phil. Soc. Edinb.,' vol. iv, 1878, p. 167. 

 H. A. Nicholson and E. Etheeidge, Jan., 'Monogr. Silur. Foss. G-irvan, Ayrshire,' vol. i, 

 1880, pp. 207—209. 



Carapace capable of being bent, possibly sutured along the back. Lateral pieces, 

 found apart, in outline like the valves of a Pinna. Dorsal (inner) margin straight ; 

 front edge rounded (in some cases semicircular, in others elliptically rounded) ; 

 ventral (outer) margin sinuous, fully convex anteriorly, sloping and partly concave 

 posteriorly. Concentrically striate, with delicate lines following the contour of 

 the margin and centring on a kind of umbo situate at about a third of the length 

 of the valve from its front edge. 



The inner border of the anterior third is somewhat oblique in some cases, and 

 apparently the two valves together would open shghtly from in front towards the 



1 At the top of the Middle or the base of the Upper Silurian. 



