310 



with but 3 — 5 funnels in each. The funnels themselves (Fig. 65. 4) 

 are fan-shaped and slightly different from the funnels of mfescens, 

 though they are of the same size. The arrangement of the wheels 

 is as in mfescens, but the wheels are smaller, measuring only 40 — 

 90 ii in diameter. 



In spite of the minute size of the specimen, the rods in the 

 skin are distinctly larger than the corresponding rods in the large 

 specimens of mfescens. Furthermore they are of quite another 

 shape with distinctly spiny ends (Fig. 65. 11). The rods in the 

 tentacles (Fig. 65. 10) are distinctly different from the rods in the 

 skin as well as from the tentacle-rods in the specimens of mfescens. 

 They are thin and slightly bent, with spiny ends. 



Polycheira echinata differs in the characteristic size and shape 

 of the rods markedly from P. mfescens. Probably also the shape 

 of the clusters of ciliated funnels will prove to be a usable character, 

 but as the specimen at hand is so young, it is not quite certain 

 that the clusters will not grow and in adult specimens be larger. 

 Furthermore the wanting of oval bodies in the longitudinal muscles 

 may be of some value as a specific character, but as long as we do 

 not know whether they are always present in mfescens, too much 

 weight should not be laid on this character. 



Tœniogyrus Semper. 

 Semper. 1868. Die Holothurien. pag. 23. 



Fisher. 1907. The Hawaiian Holothurians. pag. 735, PI. 82 fig. 2. 

 Clark. 1908. The Apodous Holothurians. pag. 121. 

 Oh shim a. 1915. Holothurians from North West Pacific, pag. 286. 

 Clark. 1921. The Echinoderms from Torres Strait, pag. 165. 



Genotype: Chiridota australianus Stimpson. 



The genus Tceniogyrus was established by Semper in 1868 for 

 Stimpson's species Ch. australiana, but was not recognized as 

 valid until 1908 in Clark's '-Apod. Holothurians". Clark 

 refers two different species to it, australianus and contortus. In 

 1915 Ohshima describes a new interesting species which lives 

 commensally with some Cidarids, naming it T. cidaridis. In 1921 

 Clark distinguishes between four species, as he regards the spec- 

 imen mentioned by Fisher in 1907 as a valid species. The 

 collection at hand includes five different species of Tœniogyrus, 



