234 DR.H.DOHRN ON THE MOLLUSKS OF THE ZAMBESI. [Feb. 28, 
really occur there, it would turn out to be the only freshwater shell 
occurring in the Nile and the South-African rivers, with the excep- 
tion of the following :— 
17. MeLaniA TUBEBCULATA, Mueller, 
Which is an inhabitant of Syria, India, Ceylon, &c. &c., as well as 
of Lake Nyassa. 
18. Mexanta nopicrncta, Dohrn, n. sp. 
Testa turrita, solida, olivacea, longitudinaliter et transverse cos- 
tata, costis transversis arcuatis, nodiferis, anfractuum supe- 
riorum nodis tri- vel quadri-seriatis, in anfractu ultimo 
nodulorum serie una accedente, basi liris angustis 8-10 circum- 
scripta ; sutura distincte impressa; anfractus subplani, lente 
accrescentes ; apertura piriformis, labri parte basali modice 
producta. 
Long. 14, diam. anf. ult. 54; ; apert. long. ;4, lat. + poll. 
Among rushes and papyrus near the south end of Lake 
Nyassa, and in the upper part of the River Shiré, where it flows 
from it. 
19. Mevanra vicror1#, Dohrn, sp. nov. 
Testa turrito-pyramidata, solida, pallide olivacea, punctis cas- 
taneis adspersa, sublevigata; sutura distinctissima, dupli- 
cata; anfractus plani, ultimus medio angulatus, basi 6-8 
sulcis cireumdatus ; apertura intus cerulescens, piriformis ; 
labrum basi valde productum. 
Long. 4, diam. anfr. ult. ;5, ; apert. long. 4, lat. =%, poll. 
From the rapids above the Victoria Falls of the Zambesi, where it 
occurred in numbers with a Paludina and Unio, both of which 
were lost. 
6. VENERIDE. 
20. CyrENA ASTARTINA, Martens. 
Lake Nyassa, the Shiré, and Zambesi. 
I regret very much that there are no Unionide in the collection 
which I got for examination. All I can state from the above list is, 
that the conchological fauna of Lake Nyassa seems to belong to the 
same region with Natal; but most of the freshwater species from the 
lake having turned out to be hitherto unknown, and some of the 
other species having been found by Capt. Speke and others far more 
northwards, it is rather difficult to come to any conclusion from the 
present collection. 
