293 



curved (Fig. 58. 6) and are only found in the posteriormost end of 

 the specimen, where they are lying in small groups, covered by 

 the "dough-nut-shaped" rods. As to the deposits in the longitudinal 

 muscles Clark states that they are wanting. Seemingly they are 

 so, but a closer examination shows that they are really present (Fig. 

 58. 11), only covered by the dense layer of "dough-nut-shaped" 

 spicules. The deposits in the tentacle-base (Fig. 58. 10) are very 

 like the deposits in the longitudinal muscles, and distinctly different 

 from the large rods in the digits (Fig. 58. 7). In the polian vesicles 



Fig. 59. Ciliated funnels of Chiridota rotifera (1) and Chiridota aponocrila (2). x 180. 



there are deposits of very nearly the same shape as those in the 

 tentacle-base. 



Chiridota aponocrita is a very characteristic species, which, as 

 Clark states, differs distinctly from all the other species of the 

 genus. 



Chiridota rotifera (Pourtalès). 



Synapta rotifera. Pourtalès. 1851. On the Holothurians of the Atlan- 

 tic coast of the United States, pag. 15. 

 Chiridota rotifera. Ludwig. 1892. Über eine lebendig-gebärende Synap- 

 tide. pag. 42—54, PI. III fig. 1—5. 

 „ „ Clark. 1908. The Apodous Holothurians. pag. 115. 



„ „ Clark. 1910. Development of an Apodous Holothur- 



ian. pag. 497—516, Pl. I— II. 

 St. Jan. 31. III. 1906. Rocky pools. 32 specimens. 

 Loango. 18. III. 1906. 4 specimens. 



Tobago, B.W. I. IV. 1916. Between corals. 30 specimens. 

 St. Thomas. 4 specimens. 



