355 



ON A COLLECTION OF LAND AND FRESHWATER SHELLS FROM 



THE UPPER NILE REGION. 



By C^sAK II. BoETTGER and Fritz Haas. 



Read 9th May, 1913. 

 The land and freshwater shells here enumerated were collected in 

 1910 by Dr. Otto le lloi, of Bonn, during Prof. Dr. Al. Koenig's 

 expedition to the Upper Mle region. It is quite natural that in 

 a collection from Central Africa the species of the genus Limicularia 

 largely predominate, both as regards the number of species and 

 specimens. The collection forms part of Dr. Koenig's museum at 

 Bonn, but duplicates have been kindly presented by the collector 

 to the Senckenberg Museum, and duplicates of the Tulmonates to 

 C. E. Boettger. The Gastropods are treated by C. II. Boettger, and 

 the Bivalves by F. Haas. 



BCRTOA NlLOTICA (Bfl'.). 



There are two specimens of this form which is found especially in 

 the lake district and near the sources of the White Nile. They were 

 collected near Gemesa, Bahr el Djebel (March 20, 1910). 



LiMicoLARiA Kambeul (Brug.), yar. tcrris, Pfr. 



In 1860 L. Pfeiifer (Proceedings of the Zoological Society of 

 London, 1861, p. 25, pi. ii, fig. 3) described a new species, Limico- 

 laria turris, based on specimens from the source of the White Nile 

 (leg. Petherick). The species was mentioned again by L. Pfeiffer 

 {Novitates conchologicce, Bd. ii, p. 162, pi. xliv, figs. 1-3, Cassel, 

 1860-6) and by E. von Martens (Malak. Blatt., 1865, p. 197). 

 E. von Martens (Malak. Blatt., 1870, p. 33, and 1873, pp. 38-9) 

 found L. turris in the collection of G. Schweinfurth from tlie Djur 

 and Rek forests, south of the Meshra of the Bahr el Ghazal. 

 E. von Martens first recognized the similarity between L. turris and 

 the West African L. Adansoni, Pfr. The first author who united the 

 two species was C. J. Jickeli {Fauna der Land- tmd Siisstvasser- 

 IfoUusken Nord-Ost-Afrika's, Dresden, 1874, pp. 154-7, pi. ii, 

 figs. 3, 4). A complete list of the forms of this group, of wliich 

 L. Kamheul was first described and ought to be the typical sub-species, 

 was given by Pilsbry (Man. Couch., ser. ii, vol. xii, pp. 251-3, 

 Philadelphia, 1904). 'We now see that L. Kamheul is a species which 

 ranges in the form of several varieties from Senegal to the sources of 

 the Nile. Dr. le Roi brought home four specimens of L. Kamheul, 

 var. turris, one from Iledjaf, Bahr el Djebel (March 14, 1910), two 

 from Kiro, Bahr el Djebel (March 17, 1910), and one from Gemesa, 

 Bahr el Djebel (March 18, 1910). 



Limicolaria klammata (Caill.). 



This species is the most common shell in North-East Africa, and is 

 one of the most variable. There is a fine series in Dr. le Roi's 

 collection : one specimen from the junction of the Bahr el (ihazal aiul 



