REPORT ON THE HOLOTHURIOIDEA. 159 



D( nail fast on it i a, Thcel. 

 Fig. 7. Deposits from the pseudhsemal vessels, which accompany the intestine. 

 ,, 8. Deposits from the free connecting stems of the pseudhsemal system. 

 „ 9. Deposits from the walls of the reproductive organs. 

 ,, 10. Deposits from the walls of the alimentary canal. 



Psychropotes longicauda, var. fusco-purpurea, n. 



„ 11. Four-armed deposits, with the arms about 0"3 mm. long. 



Psycheotrephes exigua, n. sp. 

 „ 12. Four- armed deposits, with the arms about O'l mm. long. 



Psychropotes longicauda, n. sp. 

 ,, 13. Four-armed deposits from the outer layer of the dorsal integument, the arms 



from 0"06 mm. to 0"4 mm. long. 

 ,, 14. Four-armed deposits from the inner layer of the dorsal integument. 

 ,, 15. Deposits from the tentacles. 

 ,, 16. Deposits from the ventral body-wall ; the arms from 0'08 mm. to 0'24 mm. 



long. 

 ,, 17. Deposits from the pedicels. 



Scotoanassa diaphana, n. sp. 

 ,, 18. Four-armed deposits, with the arms up to 0"016 mm. long. 



PLATE XXXVI. 



Oneirophanta mutabilis, Theel. 

 Fig. 1. Longitudinal section of the hindmost portion of the oesophagus and of the 

 foremost part of the intestine. a, epithelium ; b, outer layer of con- 

 nective tissue ; c, circular muscular layer ; d, longitudinal muscular layer ; 

 e, inner layer of connective tissue ; f, layer of glands ; g, epithelium ; h, 

 pseudhsemal vessels ; v, valve on the transition between the oesophagus 

 and the intestine. 1 

 „ 2. Transverse section of the intestine and the ventral pseudhgemal stem which 

 accompanies it. a, epithelium ; b, outer layer of connective tissue ; c, 

 circular muscular layer ; d, longitudinal muscular layer ; e, inner layer of 

 connective tissue ; f, layer of glands ; g, epithelium ; h, pseudhaomal 

 vessels within the walls of the intestine ; i, the ventral pseudhamial stem ; 

 k, epithelium ; I, circular muscular layer ; m, layer of connective tissue ; 

 a, inner epithelium. 



1 Where no measurements are given, the figures are more or less strongly magnified. 



