41 6 FAUNA HAWAIIENSIS 



The spermathecae are four pairs in 6 — 9. The pouch is sharply marked off from 

 the long duct. The diverticulum ending in an oval dilatation is about as long as the 

 duct part of the main pouch. 



Hab. Molokai and Mauna Loa. 



(2) Ainyntas heterochaeta Mich. 



Perichaeta heterochaeta Michaelsen, Abhandl. nat. Vereins Hamb. xi. p. 6. 

 P. indica Michaelsen, Arch. f. Naturg. 1892, jj. 33; nee/*, indica Horst, Vermes 

 in Midden Sumatra, iv. p. 4. 



It is rather a curious fact that the non-identity of the worm which has been called 

 by many persons, including myself, Perichaeta indica with the species described by 

 Dr Horst under that name in the memoir quoted above has not been noticed. In that 

 memoir Dr Horst distinctly figures a terminal sac (" Kopulationstasche ") to the duct of 

 the "prostate" gland. His figures of " Eine Perichaeta von Java"' on the other hand 

 do not show this duct with such a terminal swelling and refer to the species which has 

 since been called Perichaeta indica. It is clear that the proper name to refer to this 

 specimen of Dr Horst must be Dr Michaelsen's name of Perichaeta heterochaeta, in 

 which no such copulatory pouch is mentioned and which in other respects agrees with 

 the worm which has everywhere received the name of Perichaeta indica. If it were 

 certain, which it is not, that M. Vaillant described only one species under the name of 

 Perichaeta cingulata, then that would have to be the name for the species described by 

 Horst, for it agrees in the presence of the terminal sac where the male gland opens on 

 to the exterior, and in some other points. 



Dr Michaelsen would include as synonymous with this species my Perichaeta 

 nippojiica ; I think that that species may be synonymous. But that is a matter which I 

 shall enter into on a future occasion. 



I now think that I was wrong in differentiating the species P. perkinsi. Dr 

 Michaelsen, chiefly for the reason that he received an example from Ceylon with papillae 

 near to the male pores, identified my species with the one called here Amyntas hetero- 

 chaeta. I should mention however that the fact that the union of the vas deferens 

 with the male duct is not until near to the external orifice appears to characterise at least 

 the individual which I examined. I found in glycerine preparation of two examples 

 of undoubted "indica" that there was the more general union shortly after the duct 

 emero;ed from the gland. 



Dr Michaelsen and I myself have called attention to the variability which this 

 species exhibits in the presence and number of the anterior papillae and in the presence 

 or absence of the glandular part of the male terminal apparatus. Among the very 



' Niederl. Arch. f. Zool. iv. 



