LAMELLIDENS 1 1 79 



marked, especially towards the anterior ventral region, with 

 very shallow, radiate furrows. 



Long. 42, lat. 86 mm." (Preston). 



Type locality, Phenchooganj, Central Sylhet. 

 /Annellidcns phcnchooganjcnsis Pkeston, Rec. Ind. AIus., VII, 



1912, p. 306. 



Subgenus Sp.m'hopsis Simpson. 1900. 



Spat/iopsis Simpson, Syn., 1900, p. 857. 



Shell long, elliptical, compressed, beaks rather low, said to 

 bear concentrically roughened ridges, with slight plications in 

 front and behind them ; posterior ridge not developed ; surface 

 shining, smooth : hinge line narrow, with faint, greatly elon- 

 gated pseudocardinals and laterals ; escutcheon deep, triangu- 

 lar ; beak cavities shallow ; anterior muscle scars elongated ; 

 posterior faint ; iridescent behind. 



Type, Anodonta guiUaini Recluz. 



Lameu^idens guillaini (Recluz). 



Shell elongated, almost evenly elliptical, convex, subsolid; 

 beaks not greatly elevated, sharp, turned forward ; rugosely 

 concentrically grooved : posterior ridge low and widely round- 

 ed ; surface with delicate, concentric sculpture; epidermis pale 

 reddish-brown, lighter at the umbonal region ; muscle scars 

 complicated ; nacre flesh-colored, slightly iridescent. 



Length 120, height 56, diam. 27 mm. 



Denog River, Brava, Northeast Africa. 

 Anodonta guillaini Recluz, Jl. de Conch., I, 1850, p. 55. — 



Crosse, J. de Conch., XXXf, 1883, P- ^-2, pb ix, fig. 4. 

 Lamellidcns guillaini Simpson, Syn., 1900, p. 858. 

 Spatha guillaini Germain, Arch. Zool. Exp. et Gen., (5), I, 



1909, p. 56. 



The description given of this species is not at all full. The 

 excellent figure cited shows delicate lamellar pseudocardinals 

 and laterals and if it is correct this species belongs to the Lmi- 

 ionidae and it is not related to the Spatha ruhens with which the 

 author compares it. 



