408 CARBONlFEliOUS LAMELLIBRANCHIATA. 



Sangoinolites abdenensis, B. Etheridge,jun., 1877. Plate XL VI, figs. 6 — 11. 



Sanguinolites? abdenensis, B. Etheridge, jun., 1877. Geol. Mag., dec. 2, 



vol. iv, p. 246, pi. xii, figs. 9 — 11. 

 ? — ABDENsis, Kirkhy, 1880. Quart. Journ. Geol. Soc., vol. xxxvi, 



p. 586. 

 — ABDENENSIS, Etheridge, sen,, 1888. Brit. Foss., pt. 1, Palseo- 



zoic, p. 289. 



Specific Characters. — Transversely elliptical, moderately convex, very inequi- 

 lateral. The anterior end is very short, couvexly swollen, and its border is 

 bluntly rounded. The inferior border is produced and almost straight, and 

 parallel to the hinge-line. The posterior border is oblique, subtruncate above, 

 bluntly rounded below. The postero-inferior angle is prominent; the postero- 

 superior angle only slightly marked. The liiuge-line is straight, shorter than the 

 greatest length of the shell. The umbones are of fair size, tumid, elevated above 

 the hinge-line, incurved, contiguous, and placed in the anterior third of the valve. 

 Passing obliquely downwards from the umbo to the postero-inferior angle is a 

 very obscure, bluntly rounded swelling, which separates the compressed dorsal 

 slope from the rest of the valve, which is regularly convex. Lunule and 

 escutcheon small, the latter narrow and elongate. 



Interior. — The anterior adductor muscle-scar is in its usual position for tlie 

 genus, and is bounded posteriorly by a slight ridge. Pallial line entire, remote 

 from the margin. 



Exterior. — The surface of the valves is ornamented with numerous very fine 

 concentric lines and striaj of growth, which become obsolete on the dorsal slope. 

 On the surface of some valves are numerous small tubercles, very irregularly 

 distributed, both on the convexity of the valve and on the dorsal slope. 



Dimensions. — PI. XLVI, fig. 6, an uncompressed specimen from Corrie Burn,. 

 Kilsyth, measures — 



Antero-posteriorly . . . .28 mm. 



Dorso-ventrally . . . .10 mm. 



From side to side . . . .4 mm. 



Localities. — Scotland : Corrie Burn, near Cairn Bog, Kilsytli ; shore, east of 

 Abden, Kinghorn, Fife; Liddelsdale, in the Lower Carboniferous Limestone group. 



Observations. — Mr. R. Etheridge, jun., gave provisionally, as he said, the name 

 Sanguinolites ? ahdenensis to a shell found very abundantly near Kinghorn, Fife. 

 The specimens from this locality are all much flattened, find often have the two 

 valves lying open on the bedding-planes of the shale. The collection of the 



