1868.] 



DR. W. BAIRD ON A NEW SCLEROSTOMA. 



263 



The specimens were rather numerous, but, with only one exception, 

 were all females. When first deposited in the Museum, about two 

 months after the death of the Elephant, the female worms were of a 

 dark brownish -red colour, whilst the male was pure white. The 

 colour has faded considerably by being kept in spirit ; but the con- 

 trast between the two sexes was for a long time distinctly visible. 



This species, which I propose naming Sclerostoma clathratum, is 

 very different in appearance from S. sipuncidi forme, is much longer 

 and more slender ; the head is much smaller both in male and 

 female, and the caudal bursa of the male differs in structure from 



Fig. 1. Sclerostoma sipunculiforme, from the Indian Elephant, male and female, 

 nat. size. 

 1 a. Head of female, magnified. 

 1 b. Tail of female, magnified. 



1 0. Tail of male, magnified. 



Fig. 2. Sclerostoma clathratum, from the African Elephant, male and female, 

 nat. size. 



2 a. Head of female, magnified. 

 2 b. Tail of female, magnified. 

 2 c. Tail of male magnified. 



