SANGUINOLITES VISETENSIS. 395 



SANGniNOLiTES VISETENSIS, ds BijckhoU, sp. Plate XLIII, figs. 1 — 4. 



Pholadomya VISETENSIS, de Byckholt, 1847. Melanges paleontoL, le parti e, 



pi. X, figs. 1 and 2. 

 SoLENOPSis TiSETEissis, de RychhoU, 1853. Ibid., 2e partie, p. 63. 

 Sanguinolites VISETENSIS, Bigshy, 1877. Tliesaurus Devonico-Carboniferus, 



p. 313. 

 — — de Koniiick, 1885. Ana. Mus. Roy. Hist. Nat. 



Belgique, vol. xi, p. 80, pi. xv, fig. 7. 

 ? — RoEMEUi, de Kotiinck, 1885. Ibid., p. 83, pi. xvi, fig. 12. 



Specific Ghciractei's. — Shell of medium size, very inequilateral, ovate-oblong, 

 expanded posteriorly, compressed, obscurely keeled. The anterior end is very 

 small, much narrowed from above downwards, and its border elliptical. The in- 

 ferior border is convex, and descends rapidly at first ; but the convexity gradu- 

 ally diminishes, and it joins the posterior border at a well-marked angle, a little 

 larger than a right angle. The posterior border is expanded and almost poly- 

 gonally cut, joining the upper border at an obtuse angle. The hinge-line is arched 

 in front, depressed, straight, produced, and gradually raised behind. The urn- 

 bones are small, low, elongate, incurved and twisted forwards, much elevated 

 above the anterior portion, but not above the rest of the valve, and situated in the 

 anterior fifth of the valve. Proceeding downwards and backwards from the 

 umbo to the postero-inferior angle is an obscure blunt fold, which divides the 

 extensive, compressed, and expanded dorsal slope from the rest of the valve. 

 In front of the ridge the valve is compressed, but in the region of the umbones it 

 is somewhat convex. The dorsal slope is crossed by two or three equidistant 

 radiating lines. The lunule is elongate and narrow. The escutcheon is long and 

 narrow. 



Interior. — The anterior adductor muscle-scar is pear-shaped, deep, and almost 

 marginal, bounded behind by a curved ridge. The posterior scar is shallow, close 

 to the hinge-line, and remote from the posterior margin. The pallial line is 

 entire, and remote from the margin. The hinge is not known in front, but is 

 edentulous behind, and has a simple rolled margin. 



Exterior. — The surface is adorned with fine close concentric lines and strige of 

 growth, which are bent upwards towards the hinge-line at the oblique ridge, and, 

 as they pass each of the radiating lines on the dorsal slope, become bent forwards 

 at a very obtuse angle. The lines are much coarser in this portion of the shell. 

 There are obscure radiating rows of small tubercles, especially over the dorsal 

 slope. 



