Plasma membrane 



0.1// 



Fig. 3. An epidermal septate desmosome of Pelamatohydra. The junction 

 of three cells in a shows the reflection of ceil surfaces into the attachment 

 region (arrow) and the prominent cross connections. At b the lower central 

 portion of a (framed) is shown at higher magnification. At the double arrow 

 the outer dense component of the lower plasma membrane appears to be 

 continuous with the dense lines of the intercellular septa. The diagram at c 

 illustrates the arrangement of septate desmosomes as visualized from these 

 observations. See text, o— 53,000X. 6— 130,000X. (These illustrations origi- 

 nally appeared in J. Biophysic. and Biocbem. Cytol., 6: 343-352, 1959). 



56 



