A NEW CERITHIDEA 



M. M. SCHEPMAN. 



Cerithidea tenkatei n. sp. 



Shell pyramidal , slightly decollated , rather smooth , fresh 

 specimens nearly black, or obsoletely banded ; whorls 10, witli 

 a rather deep suture, slightly inflated; upper whorls with uumer- 

 ous ribs (about 15 ou a whorl), ou the last 3 or 4 whorls, the 

 ribs are more remote (about 6 or 7 on the penultimate one) , 

 while they become obsolete towards the aperture; the ribs are 

 broad and curved ; moreover the whorls have one spiral groove 

 near the suture and some specimens have one or a few grooves 

 more; last whorl with numerous grooves near the base. 



Aperture rounded ; outer margin slightly thickened , sinuous 

 above , produced below , with au angle near the canal ; columella 

 callous, tortuous ; margins connected by a distinct callus, thickened 

 near the outer margin ; canal semicircular , very short. 



Alt. 43, diam. of last whorl 18 of penultimate 13 mill. 

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Locality : Salt lake Tasi Poko , Landoe , Roti, 



This species has been coUected by Dr. H. ten Kate on his 

 journey in the east indian Archipelago , together with a small 

 variety of Cerithium morum Lam. According to the measurements, 

 there are two distinct forms , one being more inflated thau the 

 other, which may perhaps be a sexual difference; moreover the 

 specimens vary slightly in the number and development of their 



