1848.] SALTER ON FOSSILS FROM THE STINCHER RIVER. 15 



Orthis confinis, n. sp. Plate I. fig. 4. 



Rectangular, transverse, flattened, irregularly and coarsely striated ; 

 dorsal valve a little more convex, slightly channeled or depressed 

 down the central line ; area narrow, vertical ; ventral valve with a 

 slight angular ridge down the middle ; area moderate, obhque ; beak 

 scarcely projecting ; ribs in both valves numerous, irregularly increa- 

 sing in number at a short distance from the beak, and often fasciculate 

 in twos or threes, narrower than the interstices, which are smooth 

 and not crossed by any lines of growth. 



The slight depth of the central channel, sometimes hardly visible, 

 readily distinguishes our shell from O. vespertilio, which in the fas- 

 ciculation of the striae and general form it resembles ; but the ribs 

 in that are more numerous, closer, and broader than the interstices. 

 We have no specimens to show internal structure. 



Loc. Limestone of the Stincher River, Ayrshire. 



IlltENUs Davisii (Salt, in Sedgwick ined.). 



Although pretty certain that the few segments of the body we pos- 

 sess belong to the species common in the Bala limestone, it would be 

 out of place to give its characters here. Possibly the fragments may 

 be /. Bow7nanni, Mem. Geol. Survey, vol. ii. pt. 1, but the segments 

 appear narrower, and therefore more like the Bala species. 



Loc. Limestone of Stincher River, Ayrshire. 



Fossils of the Slates o/Locu Ryan and Coast o/" "Wigtownshire. 



EuoMPHALus? furcatus, M'Coy. 



Syn. E. furcatus, M'Coy, Sil. Foss. Ireland, pi. 1. fig. 1 1 (icon. mala). 



An impression of the upper side of the last whorl of a species 

 characteristic of the Lower Silurian shales of S.Wales and Wexford ; 

 it differs a little however, for the lines of growth are not sharply 

 raised as in the Welsh fossil, a difference possibly due to the greater 

 compression of the slate, or perhaps to this being a cast of the upper 

 side. The Welsh specimens show only the base of the shell. 



Loc. In reddish slate with Graptolites, Loch Ryan. 



Graptolites FOLitJM, Hisiugcr. Plate I. fig. 5. 



Lower portion or stem linear, strongly dentate below, with teeth as 

 broad as they are prominent ; upper portion much broader, obtuse, 

 serrated, with close narrow teeth projecting forwards, [the whole flat, 

 with no projection at the midrib, and very thin and membranous ?]. 



Although Hisinger's figure is so short, it is probably a fragment of 

 the above-described fossil, very common in Lower Silurian shales. 

 The state of preservation in which it is found, on the faces of fine 

 slates, makes it unlikely we shall be able to get at the thickness, 

 texture, or minute structure ; indeed it was probably rather mem- 

 branous than corneous. 



Loc. Black slate, Loch Ryan ; red slate. Loch Ryan. 



