94 KEroitT — 1884. 



genus, of course. Length (as it is) 23 mm., width 12 mm. This fossil 

 was collected by Mr. Mair, F.G.S., at Long Sleddale in a Graptolitic 

 mudstone of the Coniston series, and has been thought to be such as 

 Salter intended for his P. anatirta. 



3. Peltocaris, sp. 



In the British Museum, two specimens of a small Peltocaris in the 

 Moffat Anthracitic shale from Wasthope Barn, at St. Mary's Loch, shows 

 an obovate outline, broad and round anteriorly (when perfect), narrowed 

 and pointed behind ; almost cordate. A portion of the front plate 

 remains in the semioval notch of one of the specimens. Length probably 

 14 mm., width 10 mm. 



4. Peltocaris, sp. 



In shape much like Aptycltopsis No. 8, page 18 ; small, oblate or 

 transversely oval, but with a very wide semicircular notch. In the 

 British Museum ; from the Moffat anthracitic shale of Belcraig, Annan- 

 dale (either the Birkhill or Hartfell series = Lower Llandovery, or 

 Caradoc-Bala). Length fore and aft (shortened by pressure) probably 

 9 mm. ; transverse (rather increased) 13 mm. 



In the Cambridge Museum is a similar but still smaller Peltocaris, 

 shortened and widened by the mudstone having been squeezed horizon- 

 tally. Fore and aft diameter probably mm., transverse (increased by 

 squeeze) 9 mm. Collected by Mr. Marr, F.G.S., in the Coniston 

 Mudstone at Skelgill Beck, near Ambleside. 



5. Peltocaris? Harlcncssi, Salter, 1863. 'Quart. Jour. Geol. Soc' 

 vol. xix. p. 89, fig. 2 (woodcut). 



Shape indeterminate ; it may be a piece of any large species, and the 

 author was uncertain as to its alliance. Anthracite beds (of Llandeilo 

 age), Dumfriesshire. 



Geological horizon 

 f Lower and Middle 

 1_ Silurian. 



1 



Lower Silurian. 

 f Lower or Middle and 

 \ Upper Silurian. 



Lower Silurian. 



No Goniatites have been found with any of these. 



XII Pinnocarts, R. Etheridge, Jun., 1878. 'Proc. B. Phys. Soc. 



Edinb.' vol. iv. 1878, p. 167 ; Nicholson & Etheridge, Jun., ' Fossils 



of the Girvan District ' (1880), p. 207. 

 Carapace bent and probably sutured along the back. Lateral pieces, 

 found apart, in outline like the valves of a Pinna ; dorsal margin straight ; 

 front edo-e rounded (in some cases semicircular, in others elliptically 

 rounded) ; ventral margin sinuous, fully convex anteriorly, sloping and 

 sometimes partly concave posteriorly. Concentrically striate, with 

 delicate lines following the contour of the margin and centering on a 

 kind of umbo situate at about a third of the length of the valve from its 

 front edge. 



