ACTINOPODOUS HOLOTHUßlOIDEA. 



169 



are in four rows, along the two dorsal ambulacra and the lateral 

 margins, with many smaller ones interspersed between them. 

 This form was distinguished by Selenka as //. armata. In the 

 specimens from more southern parts, the papilla? become shorter 

 and fewer. Some individuals seem even entirely smooth. This 

 is the form which 1 propose to call australis. It seems to me 

 probable that while the armata-iovvn. alone is found in Northern 

 Japan, both armata- and australis-iovm^ are found in the southern 

 parts. They are not varieties in the sense that they are different 

 from the typical form of the species, but rather they are the two 

 extremities of a large group of 

 forms all connected by inter- 

 mediate forms. The difference 

 seems to be correlated with their 

 liabitat, as indicated above. 



I have stated already in a 

 former paper that the calcareous 

 deposits of this species change 

 with age (Mitsukuki 1807a, pp. 

 35-41). Besides the tables, there 

 are a few supporting rods in 

 the ventral pedicels (textfig. 29 

 a, h). They are more numer- 

 ous in the dorsal papillae, most 

 of which possess very small end- 

 plates. Numerous, very complex- 

 figured calcareous bodies in the 







^ J 



r 



^fe< 



^■Pa. 



\G 



V^ 





^/ 



^'■'-'■c:^~çyy. 



^mm^^ 





Ö 



CM 



o9^ 



OJ 



Textfig. 29. 

 Stichopus japonicus : a, h — Supporting rods 

 of pedicel ; c, d — Rods from genital tubes ; e — 

 Cloacal wall (e). They extend up Complex plate from cloacal wiJl. (x300). 



into the larger branches of the respiratory tree, gradually dimin- 

 ishing in number as they ascend in the tree. Eeproductive 



