112 LANISTES CONGICUS. 



As the species was not yet described , Dr. Boettger kindly 

 allowed me to publish here his description of the type 

 specimens, which were collected near the village Elau, on 

 2 days journey from San Salvador, Congo. 



The specimens of the Leyden Museum (see plate 8, figs. 

 1 and 2) are, however, much smaller than those of Dr. 

 Boettger , who says on this subject : I think that none of 

 your two small varieties ought to bear a distinct name. 



The specimens vary in the carina of the base , which is 

 more or less sharply marked , and in the elevation of the 

 spire, which is much eroded in nearly all the specimens. 



The measurements of a few specimens of the Leyden 

 Museum are: 



Alt. 23, diam. max. 2172, alt. apert. 15, lat. apert. 11 mm. 

 » 16, » » 21, » » 13, » » 10 » 

 » 16, » » 19, » » 13, » » 9^/2 >'- 

 » 11^/2? >> * 14, » » 9, » » 7 » 



Rhoon near Rotterdam, February 1891. 



Notes from the Leyden IMuseum, Vol. !X.III. 



