THE NAUTILUS. 



77 



eric) name should be found to be necessary, Cafferia Simpson 

 should be considered. 



Spatha (Spatha) wahlbergi (Krauss). 

 Simpson, Descr. Cat. 1914, p. 1326. 



From Mr. W. Israel I have received two specimens from 

 Mkata River (tributary to Wami R. ), and two specimens from 

 Ngerengere River (tributary to Kingani or Ruwu R.) both near 

 Mrogoro, German East Africa (collected by Mr. Rudolf). They 

 all resemble each other, but the specimens from the Mkata have 

 a brownish epidermis, those from the Ngerengere a blackish 

 brown one. They agree well with the description and figure of 

 S. natalensis Lea (Obs. xi. 1887, pi. 20, f. 58), which is a 

 synonym of wahlbergi Krauss. 



The specimens from the Mkata are both females, those from 

 the Ngerengere are male and female. 



In Nautilus 24, 1910 pp. 39-42, I have described the soft 

 parts of Spatha kamerunensis Walker, a West African form, 

 which belongs to the subgenus Aspatharia Bourguignat. The 

 present species is a real Spatha, and the examination has shown, 

 that it closely resembles kamerunensis in its anatomy, with the 

 exception of one detail. 



Anal opening ovate, about as long as the branchial, closed 

 above by the union of the inner edges of the mantle, without a 

 supraanal opening. Edge of anal thickened and wrinkled, but 

 without papillae, probably capable of a moderate tubular ex- 

 tension (siphon). Anal separated from the branchial opening 

 by a solid connection of the mantle edges. Branchial defined below 

 (or anteriorly) by connection of the inner mantle edges, which, how- 

 ever, is short, shorter than the branchial (about one fourth to 

 one third as long). In one of my specimens, this connection 

 is torn apart, but still distinctly recognizable. Edge of branchial 

 somewhat elevated and with small or indistinct papillae, pro- 

 bably also forming a short siphon. Farther in front, the 

 mantle edges are unconnected and smooth. 



Palpi and gills exactly of the structure described in Spatha 

 kamerunensis. Also here the inner lamina of the inner gills is 

 free from the abdominal sac, and the septa of the gills are of 



