1"22 Prof. E. LJinnberg and Mr. IT. RonJalil o/i 



straiglit beneath and not extending into the nmbilicus, 

 Avhich is not wide, l)ut deep, extending; to the apex and 

 hardly diselosing all the wliorls. 



Diani. niaj. 53, niin. 4*7; alt. 1'5 ; apert., alt. 1*5, lat. 

 2*4 mm. 



Type-lucality. Nwainbukoto, Rikatla (//. .1. Junod). 



Assimhiia leptodonta, sp. n. 



Shell very small, broadly ovate, imperforate, solid, shin- 

 ing, translneent, darkish brown. Spire moderately produced, 

 uith straight sides meeting at an angle of about 50° ; apex 

 aente. Whorls G, almost flat above, but well rounded at the 

 periphery and very rapidly increasing ; the a[)ical 1^ micro- 

 scopically punctate, later whorls sculptured with very faint, 

 straight, slightly irregular striae or growth-lines, only visible 

 under a strong lens, crossed by much finer, extremely close, 

 microscopic, spiral stride ; suture flat, broadly and very 

 strongly margined below. Aperture subovate, somewhat 

 flattened at the base; peristome simple, acute; outer lip 

 straight in profile and hardly receding ; columella white, 

 slightly concave, margin uaiTOwly adnate ; callus white and 

 thin. 



Alt. 5*2, lat. 3-4; apert., alt. 30, lat. 2*0; last whorl 

 4*2 mm. 



Type-locality. Estuary of the Nkomati River, Rikatla 

 (//. A. Junod). 



IX. — Some new Silurids from the Congo. 

 By EiNAR LoxNBEiiG and Hialmar Rendaiil. 



The Silurids described below belong to the R. Nat. Hist. 

 Museum in Stockholm. 



Glanas lualcB^ sp. n. 



Depth of body about 9 times in total lengtl), length of head 

 4 1 times. Head l^-la times as long as broad, granular 

 above. Occipital process angular. Fontanelles large ; the 

 frontal one has a rather peculiar shape, which is elucidated 

 by the accompanying figure (fig. 1). Its anterior greater 

 and somewhat blade-shaped portion partly divided from the 

 posterior somewhat rounded portion by a pair of lateral 

 processes. The occipital fontanclle is almost oviform and 



