COMMON TIIYONK. 



233 



HOLOTHURIADM. 



Til YONES. 





Genus Thy one. Oken. 



Generic Character. — Body nearly regular, covered with scattered papillose 

 suckers ; tentacula ten ; teeth of the dental apparatus long and filiform. 



COMMON THYONE. 



Thyone papulosa. Midler. 



Specific Character. — Body elongate-ovate, brownish white ; tentacula much 

 pinnate. 



Holot/iuria papi/losa, Muller, Zool. Dan. tab. cviii. fig. 3. Jaeger, de Holuth. 



Encyc. Meth. pi. lxxxvi. figs. 5, 6. Blainville, Man # 



d'Actin. p. 193, pi. xiii. fig. 2. 

 Mulleria papulosa, Johnston, Mag. Nat. Hist. vol. VII. p. 584, fig. 66. 

 Thyone papillosa, Oken. Agassiz, Prod. 



The genus Thyone was constituted by the distinguished 

 German naturalist and philosopher, Oken, for the reception 

 of such Holothuria as have the suckers dispersed over the 

 whole surface of the body, as in the species before us. 

 But though the suckers are so scattered, the pentagonal 

 form and radiated appearance of the animal is not so much 

 lost as in Psoitis ; indeed, in many specimens certain of 



