DEVELOPMENT OP THE OAPE SPECIES OP PERIPATUS. 467 



The Development of the Cape Species of 

 Peripatus. 



PART III. 



ON THE CHANGES FROM STAGE A TO STAGE F. 



By 



Adam Sedgwick, 9I.A., F.Ii.S., 

 Fellow of Trinity College, Cambridge. 



With Plates XXXTV, XXXV, XXX VT, and XXXVII. 



The early development of Peripatus capensis, as de- 

 scribed in Parts I and II of this series, is apparently so 

 different from that of the West Indian and New Zealand 

 species, and at the same time our knowledge of the early 

 stages of these species is still so incomplete/ that it is difficult 

 at present, and would indeed under the circumstances be 

 waste of time, to attempt to institute any detailed comparison 

 between them. With regard to the later stages, however, tlie 

 matter stands otherwise; for not only do they seem to be 

 alike in the three species, but in the case of the West Indian 

 species at any rate we have in Dr. KenneFs memoir, if not a 

 complete still a detailed and coherent account of them. 



While able to speak, to this extent,^ favorably of Kennel's 



1 In spite of Dr. Kennel's objection, 1 must adhere to the view expressed 

 in Part I of this series, that his account of the early stages of the Trinidad 

 species presents internal evidence of the incompleteness of his observations. 

 To particularise ; his account of the relation of the embryo to the uterine 

 wall, and of the origin of the so-called amnion and placenta, seems to me 

 unsatisfactory. 



2 I am obliged to confess that Dr. Kennel has made some rather important 



