244 ^' Annandale. 



one side horizontally. Its walls are comparatively thin and have onlj a 

 few microscleros adhoring to them. These spicules are parallel to the 

 external surface of the capsule. 



Length of skoleton-spicule (amphistrongyli) . . . 0.152 — 0.172 mm 

 Tliickness of skeleton-spieule (amphistrongylij . . 0.012 „ 



Length of free microsclere (amphioxi) .... 0.036 — 0.06 „ 

 Thickness of free microsclere (ampliioxi) .... ca. 0.004 „ 



Length of micramphidisc . ca. 0.024 „ 



Length of gemmule-spicule 0.024 — 0.04 „ 



Thickne-ss of gemmule-spicule 0.008 — 0.012 „ 



Diameter of complete gemmule 0.425 — 0.52 „ 



Length of inner capsule ofgemmule (including tubule) ca. 0.323 „ 



Lesser diameter of inner capsule of gemmule . . ca. 0.255 „ 



Locality: E. Zambesi, near the Victoria Falls; W. Mtchaelsen, 

 18. August 1911. 



Type in the Hamburg Natural History Museum; co-type in the 

 Indian Museum, Calcutta. 



This species differs from the others in the C. böhmii gToup in the 

 structure of the gemmule and in particular in the peculiar form of its 

 inner capsule. 



The other mcmbers of the group Tnamely, C. höhmii, C. micramphi- 

 (liscoides, and C. scabrispiculis) have always been found associated with other 

 animals; — C. micramplddiscoides and C. scabrispiculis (as also C. loricata in 

 the group with smooth skeleton-spiculesj on shells of the mollusc ^'Etheria, 

 and C. böhmii on the external surface of Spongilla nitens. It is thereforo, 

 interesting to note that the types of C. victoriae were found on stones. 

 As a rule they were not associated in any way with other organisms, but 

 in one instance gemmules of the Coi'vospongilla lay side by side with 

 thoso of the type specimen of Spongilla africana. 



Part IL The Distribution of tlie African Spoiigillidae. 



In a recent paper Weltxer'j has given a list of the African Spon- 

 gilUdae, with precise detail« of the locality or localities from which each 

 species has been recorded. His list includes the names of 23 s])ecies ; in 

 the samo paper two new Spongillidae are described by him, and, including the 



'j Wiss. Ergebn. d. Deutschen Zentral-AtVika-Expedirton, 1907 — 1908, Baud IV, Zoologie 

 ii, Lief. 12 (SüiJwassersclnvämme), pp. 475, 476. 



