297 



and occur in a single row in each dorsal interambulacrum. In the 

 papillae there are "Schnüre mit Kalkrädchen". The calcareous de- 

 posits make a dense coat all over the skin. They are of very 

 varying size and shape (Fig. 61. 1), the larger ones being crescent- 

 shaped with trispinous ends. There is no loop on the alimentary 

 canal in the fragment, but, though all the three mesenteries are present 

 and united with the intestine, a loop may be present in this species. 

 The mesenteries are very interesting, in being reduced to fine and short 

 threads. For this reason the ciliated funnels are found on the body- 

 wall. They are rather large and always united into long-stalked clu- 

 sters (Fig. 61. 2). Chiridota violacea was previously reported from 

 Ibo, Mosambique and from the Amirante Island. 



Chiridota pisanii Ludwig. 



Chiridota pisanii Ludwig. 1886. Die vom G. Chierchia gesammelten 

 Holothurien. pag. 29—31, PI. 2 fig. 14. 



„ „ Ludwig. 1898. Holothurien der Hamburger Magel- 



haensischen Sammelreize, pag. 71. 



„ „ Ludwig. 1898. Die Holothurien der Sammlung Plate, 



pag. 445. 



„ „ Clark. 1908. The Apodous Holothurians. pag. 118. 



Calbuco Straet, Chile, 2 specimens identified by H. Ludwig. 



Chiridota pisanii was rather well described by Ludwig in 1886 

 and 1898, but neither the peculiar shape of the calcareous ring nor 

 that of the ciliated funnels are mentioned. Therefore it was possible 

 for Clark to write (Apod. Holoth.) that pisanii is "strikingly sim- 

 ilar to the widely distributed northern species, Ch. lœvis" and: "Cur- 

 iously enough, Ludwig does not in any of his several papers make 

 any reference to this similarity, and yet it is quite noticeable. Indeed 

 it is hard to draw any sharp line between the two species." 



The examination of the two specimens at hand shows that 

 Clark's supposition is erroneous and that pisanii is by no means 

 closely related to lœvis, from which species it differs distinctly in 

 the shape of the calcareous ring, the ciliated funnels and the ten- 

 tacle-rods. 



The specimens at hand measure 6 cm in length. Their colour 

 is, probably due to the long remaining in alcohol, pure white, with- 

 out any traces of red. They have 12 tentacles, each with 5 pairs 



