242 ^- Anxaxdäle. 



that of its gemmule, if I am right in believing that the gemmules here 

 assigned to the species actuallv belong to it. They were not found inside 

 thc sponge, AA'hich was evidently young and immature, but closely adjacent 

 to it on thc same stone, together with gemmules of Corvospongilla vicioriae. 

 Some of their spieules, however, approach those of the skeleton of S. afri- 

 cana very closely. 



Gen. Corvospongilla, Annandale. 



Ineluding the ncAv sponge described below, six species of this genus 

 are now known from Tropical Africa, of the faima of which, as also of 

 that of Peninsular India, it is particularly characteristic. The species fall 

 naturally into two grovips — those Avith smooth and those with spiny 

 skeleton-spicules. The latter group, to which the new species belongs, is 

 only knoAvn from Tropical Africa. 



Key to the African Species of Corvospongilla» 



1. Skeleton-spicules smooth. 



A. Skeleton-spicules on an average 7 V2 times 



as long as thick C. zamhesiana. 



B. Skeleton-spicules 11 to 13 times as long 



as thick C. loricata. 



IL Skeleton-spicules spiny or gramdar. 



A. Gemmule-spicules sparsely spined (ab out 



50 spines to a spiculej C. hölimii. 



B. Gemmule-spicules much more densely 



spined. 



1. Inner capsule of gemmule flask- 



shaped , . C. victoriae. 



2. Inner capsule of gemmule spheri- 



cal or subspherical 



a. Gemmule-spicules (amphistron- 

 gyli) 2 to 5 times as long as 



thick C. micramphidiscoides. 



b. Gemmule-spicules (amphistron- 



gyli) 3 to 12 times as long as 



thick C. scabrispicuHs. 



