320 



Mv. J. Tiiomson on a 



value to warrant this species being raised to the rank of a 

 separate genus, or whetlier we should regard such nioditi- 



Fig. 2. — Thi/saitopJn/llion orientale. 



cations as simply indicating an evolutionary tendency. Wilh 

 the latter view 1 cordially sympathize, and, as formerly stated, 

 ] hope at no distant date to show that other species occur in 

 which there are structural characters equally distinct and 

 difllcring as widely from the parent type, but which I do 

 not feel warranted in raising to generic distinction. 



Lithostrotiou paradoxicum^ sp. no v. 

 Fi-. 3. 



Corallum compound, cylindrical, and dichotomous. De- 



