MOLLUSCA FROM THR SOUTHERN SUDAN. 



267 



•description, nor has any been subsequently published. In addition, Prof. 

 'Cockerell apparently was not in possession of any information as to the actual 

 ■colour of the species, his account being based on the colour of a specimen 

 preserved in alcohol. Thanks to the careful notes of the colour made by 

 Mrs. LongstaflF, and to the kindness of Dr. H. M. Gwatkin, who lent the 

 author the radula of the type specimen for purposes of comparison with that 

 of Mrs. Longstaff^s example, it is now possible to give a fuller account of 

 this interesting species which, as Prof. Cockerell says, extends the range 

 of the genus fifteen degrees further north in E. Africa. 



Veronicella kilotica, Cockerell. 



Extertial ajypearatice and remarks on general disposition of some of the 

 internal organs, see 'Nautilus,' xxiii. p. 108. 



Fis. 1. 



m 



31 32 33 44 45 



Veronicella nilotica, Cockerell. — Radula. Holotype in possession of the Rev. Dr. Gwatkin. 

 By Nile above Khartum. Figured nnder 4 oc. x 6 obj., Reichert. 



Radula. — The exact number of teeth in a row is not quite certain but is 

 probably not more than 50 ; 48 may possibly be the average number in a 

 row. The sinuosity indicated on the base of the teeth numbered 29-33 in 

 ■the figure is frequently, though not always, emphasized so as to form a 



Fio-. 2. 



Veronicella nilotica, Cuckerell. — Jaw. Holotype in Zoological 

 Dept. British Museum. Hillet al-Nuwer, Bahr el-Gebel, 

 Figured under 4 oc. X 3 obj., Reichert. 



marked notch or indentation. Somewhere about the twenty-ninth or 

 thirtieth tooth in each row, a marked transition is effected toward the 



23* 



