THE MALAYAN SPECIES OF ONYGHOPHORA. 63 



the myotome, which has already reached a fairly advanced 

 state of development, is placed, as in all the other somites. 

 Fig. 12 /on the same plate shows the second somite divided 

 into median and appendicular portions, both of which are 

 much reduced in size and ultimately disappear. 



(4) The Development of the Third Somite {som."). 



The third somite passes through the early stages of its 

 development in a way similar to a somite from the mid-region 

 of the body, which has been already described. However, 

 some peculiar points in its history should be noticed, and are 

 illustrated in fig. 12 g on PI. 7. In the first place, the 

 distal extension of the appendicular ccelom is much larger 

 than in any of the succeeding appendages, a fact which is in 

 keeping with the great size of what, in the adult, may be 

 designated the salivary ccelom. In the second place, the 

 downward outgrowth from the appendicular ccelom to 

 form the duct is much larger than the same outgrowth is in 

 any other appendage. The later stages in the development 

 of the appendicular ccelom of the third somite so closely 

 agree with the account given by Mr. Sedgwick of the course 

 followed in the development of the salivary gland in P. 

 capensis, as to make any further remarks unnecessary (5). 



(5) The Development of the Grenerative Organs. 



Before I proceed to describe the development of the 

 generative system in Eoperipatus, it is necessary to 

 summarise von Kennel's and Mr. Sedgwick's accounts of the 

 development in Peripatus edwardsii and Peripatopsis 

 capensis respectively; for the descriptions given by these 

 two embryologists disagree to such an extent as to render 

 the development of the organs under consideration a subject 

 of absorbing interest. 



According to von Kennel's account, first, the germinal 

 nuclei arise from the mesoderm ; secondly, only one pair of 

 ^oinites takes part in the formation of the generative organs; 



