175 



dency to form convolutions, but is peculiar in being attached basally to 

 a pyriform enlargement absent in Z. henseni judging from vanBene- 

 den's figures. The appearance suggests the trefoil development into the 

 cnido-glandular tract (Nesseldrüsenstreif) , and ciliated tracts (Fhmmer- 

 streifen) of adult Zoantharian zooids, but these divisions although more 

 sharply defined about the middle of the coelenteron are present from 

 the neighborhood of the pharynx to the aboral pole. 



The cells composing the terminal rounded section of the macrosepta 

 are, as in Z. henseni^ slender, frequently vacuolated, but usually stain 

 activly. Nematocysts, often of comparativly large size, occur in this 

 same region. The pyriform portion is composed of cells essentially the 

 same as those of the intraseptal endoderm save that they are not so 

 high. The basal section consists of low, cubical or rectangular cells like 

 those covering the microsepta. These last named structures are all 

 small, and extend from a point near the aboral pole to the inner end of 

 the pharynx. Judging from their size, both species of septa arise in 

 precisely the order assumed by van Beneden for Z. henseni. 



Concerning the relationships of these organisms I have nothing 

 to offer. The specimens thus far secured are far from a fully developed, 

 sexually mature condition and are adapted for a pelagic existence, and 

 furthermore the transformations necessary for the assumption of the 

 adult form are totally unknown. In view of the peculiar character of 

 the ciliated plate and the presence of an aboral pore Z. semperi differs 

 widely from Z. henseni and the present species, and it may well be that 

 the adult forms are widely separated systematically. 



5. Note on the Supposed Type Specimen of Peripatus leuckarti Saenger. 

 and on the Nomenclature of the Australian Onychophora. 



By Arthur Dendy, D. Sc, F.L.S., Professor of Zoology in King's College 

 (University of London). 



eingeg. 2. März 1906. 



In my memoir on the Oviparous Species of Onychophora, published 

 in the Quarterly Journal of Microscopical Science^, I pointed out the 

 necessity for a re-examination of the original type of Peripatus leuckarti 

 Saenger, in order to finally settle the vexed question of the nomen- 

 clature of the various Australian species of the group. Within a few 

 months of the publication of this memoir I was able, thanks to the kind- 

 ness of the Curator of the zoological Museum at Leipzig, which I visited 

 in 1902, to make the following notes on a specimen which there is little 

 doubt is the identical " one described by Saenger and formerly in the 



1 February 1902. 



