10 THÉEL, HERMAPHRODISM IN HOLOTHURIDS. 



25 — 30 bundles of reddish female tubes with large 



eggs. 

 d. The foremost part of the genital basis protrudes very 



minute dusters or simple club-shaped follicles. 

 Specimen 3. Caught Jidy .9, 1900. Length ahout 250 mm. 

 The arrangement of the genital organ in this specimen 



is much the same as in the preceding, except that 



the posterior naked portion is longer, and is curved so 



that it takes the form of an S. 

 Specimen 4. Caught July 9, 1900. Length ahout 150 mm. 



a. The posterior spiral portion of the genital basis is 

 almost 4 mm. long and is marked with many macula?, 

 and with several processes with the free end club- 

 shaped and of a yellowish brown colour. 



b. The portion in front of the former bas 16 bundles of 

 large reddish female tubes of an elongated oval form, 

 the largest measuring about 25 mm. in length. The 

 brick-coloured eggs are visible through the thin walls 

 of the tubes. 



c. Next in order, we find 23 bundles of light flesh- 

 coloured male tubes attaining a length of as much as 

 15 mm. 



d. Most anteriorly are situated the minute dusters aud 

 club-shaped tubes. 



Specimen 5. Caught July 9, 1900. Length ahout 200 mm. 



The arrangement of the tubes is the same as in spe- 

 cimen 1, except that a bundle situated between the 

 male and female tubes contains, hesides an infinite 

 numher of active spermatosoa, large and ivell developed 

 scattered eggs.^ 



Specimen 6. Caught July 12, 1900. Length ahout 150 mm. 

 a. The posterior spiral portion of the genital basis is 

 beset with a number of distinct maculse and, in front 

 of these, with eight rather considerable processes having 

 their ends slightly branched and presenting yellowish- 

 brown irregular dilatation s. 



* I dissected more than 10 other specimens, all captured the same day 

 and in the locality "Flatholmen", and in all these cases the genital bundles 

 were arranged in the same %vay as in specimen 1. Consequently, among more 

 than 15 specimens, only a single one had the posterior bundles filled with 

 «ggs. 



