On the Early Stages of the Development of a 

 South American Species of Peripatus.^ 



By 



'W, li. Sclater, B.A., F.Z.S. 



With Plate XXI. 



Contents. 



I. Introductory Remarks. 1 IT. Structure of the Uterus. 



III. Details of the Development. 



I. Introdxjctoky Kemarks. 



The development of the South American form of Peripatus 

 has been worked at by one author only^ Kennel, who brought 

 his material from Trinidad. In his two published papers (3) 

 his results are so much at variance with the results arrived 

 at by Mr. Sedgwick (6), who has worked solely at the South 

 African form of the same genus, that it seems worth while 

 to go through the early stages of the South American Peri- 

 patus again. This I have been enabled to do by means of 

 specimens of Peripatus brought home by me alive from 

 Demerara, which have supplied me with a fairly complete 

 series of embryos from the earliest stages onwards. 



The species of Peripatus occurring in Demerara^ seems to 

 me to differ materially from the other South American species, 

 as I have pointed out in a note in the ' Proceedings of the 

 Zoological Society' (5). But the absence of well-preserved 

 material makes it very difficult to settle this question with any 

 degree of certainty. 



' Called by Sedgwick Peripatus Demeraranus; vide " Monograph of 

 the Species of Peripatus," in Part 3 of this volume of these ' Studies.' — Ed. 



B 



