Benham. — The Sipuncuiids of Nexo Zealand. 181 



Or, taking the proportional breadths and lengths, we 

 have — 



F, W. H. A. P. T. 

 Length of introvert 



Length of body 

 Breadth 



1 1 



8 3 



Length 

 Breadth 



of body ... ... 3-I5 



of introvert ... i- ^ 



Length 



I am not aware how far the proportional lengths of body 

 and proboscis are of value in determining specific characters, 

 but, seeing that in Physcosoma annulatum there is consider- 

 able variation in relative length of introvert and body, de- 

 pending on the method of killing and so forth (seq above), 

 it is probable that the diiferences above tabulated may be 

 explicable in the same way. 



It will be noted that in the Auckland specimen the intro- 

 vert is relatively nearly thrice as long as in the Cape Campbell 

 specimen, and the question suggests itself, Was the introvert 

 in the latter fully extended ? No mention is made of the 

 tentacular crown by Captain Hutton, and it is possible that 

 the introvert was only partially everted. But the animal is 

 relatively about one-third the diameter of the carefully killed 

 individual from Auckland, which might be the result of kill- 

 ing it in strong alcohol. 



We have, at any rate, I think, only a difference of size 

 to contend with ; and, failing other known differences, it is 

 scarcely likely that this would be a specific difference, as 

 amongst my material the individuals (some twenty or thirty) 

 from Waiheke are much smaller than the Auckland or 

 Warrington individuals. 



As I have said, I can find no trace of the undoubted 

 ""type" of Sipunculus luiulentus, and in communicating with 

 Captain Hutton on the subject he says that, as far as he 

 remembers, he had only one specimen of S. lutulentus. If 

 that is so, then the individual {h) must be the type, and 

 Dendrostoma huttoni be replaced by D. lutulentum of the 

 Index F.N.Z. 



But now let us turn to Baird's description of Sipuncuhis 

 (Bueus and compare it with Hutton's description of S. lutu- 

 lentus, and I think we shall find that these two are syno- 

 nymous. For ready comparison I will arrange the characters 

 in parallel columns : first, Hutton's diagnosis of his species ; 

 secondly, Hutton's translation''' of Baird's Latin diagnosis; and, 

 thirdly, Baird's longer description, which is here dissected. 



* Trans. N.Z. Inst., xi., 316. 



