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Only on e species, properly belonging to this genus, has yet been detected. It was well 

 represented in the Malay Archipelago. 



i. Scolecithrix danae (Lubbock). 



Undina danae Lubbock, 1856, p. 15, pi. IX. 

 Scolecithrix danae Brady, 1883, p. 57, pi. XVII. 

 Scolecithrix danae Giesbrecht, 1893, p. 265, pis. 13 & 37. 

 Scolecithrix danae T. Scott, 1893, p. 49. 

 Scolecithrix danae Giesbrecht & Schmeil, 1898, p. 42. 

 Scolecithrix dana I. C. Thompson, 1900, p. 279. 

 Scolecithrix danae Cleve, 1901, p. 9. 

 Scolecithrix danae A. Scott, 1902, p. 403. 

 Scolecithrix danae I. C. Thompson, 1903, p. 20. 

 Scolecithrix danae Thompson & Scott, 1903, p. 245. 

 Scolecithrix danae Cleve, 1903, p. 368. 

 Scolecithrix danae Cleve, 1904, p. 197. 

 Scolecithrix danae Sars, 1905 (a), p. 5. 

 Scolecithrix danae Wolfenden, 1905 (a). p. 1009. 

 Scolecithrix danae Esterly, 1905, p. 164, fig. 26. 

 Scolecithrix danae van Breemen, 1908, p. 70, fig. 80. 



Scolecithrix danae was well distributed throughout the area traversed by the 'Siboga' 

 as the following records shew. It was moderately common in some of the collections. 



Stat. 19. — Stat. 36. - ■ Stat. 37. — Stat. 40. — Stat. 47''. — Stat. 50. — Stat. 66. — 

 Stat. 75. — Stat. 81. ■ - Stat. 93. -- Stat. 96 (day). -- Stat. 96 (night). -- Stat. 98. - 

 Stat. 109. - - Stat. 117, 60 specimens. — Stat. 118. - - Stat. 124. -- Stat. 125 (day). - 

 Stat. 128. — Stat. 133. — Stat. 136, 85 specimens. — Stat. 138. — Stat. 141. — Stat. 

 142. — Stat. 143. - - Stat. 144. — Stat. 148. — Stat. 149. — Stat. 157. — Stat. 165, 

 70 specimens. - - Stat. 168. — Stat. 1Ó9. — Stat. 172, 70 specimens. — Stat. 174. - 

 Stat. I77 a . — Stat. 184, 45 specimens. — Stat. 185. — Stat. 186. Stat. 189'. — 



Stat. 193. — Stats. 194 — 7. — Stat. 203 (surface), 1 specimen. — Stat. 203 (1500 metres 

 to surface), 12 specimens. -- Stat. 204. — Stat. 213. — Stat. 214. -- Stat. 215", 65 speci- 

 mens. — Stat. 216. -- Stat. 217 (horizontal cylinder), 55 specimens. -- Stat. 220 (surface), 

 70 specimens. — Stat. 220 (200 metres to surface), 70 specimens. - - Stat. 223. — Stat. 

 224. — Stat. 225. - - Stat. 229. — Stat. 243. — Stat. 245. — Stat. 252. — Stat. 271. - 

 Stat. 276. — Stat. 282. — Stat. 304. — Stat. 315. 



This species is easily distinguished by its very robust body and short abdomen. The 

 female has no fifth feet. The male fifth pair is well developed and prehensile. 

 Scolecithrix danae appears to be generally distributed in tropical seas. 



Genus Scolecithricella G. O. Sars, 1902. 



The females of this genus are recognised by the presence of a fifth pair of feet. The 

 fifth feet of the known males is well developed and forms a prehensile organ. The majority 

 of the sensory organs on the apex of the first pair of maxillipedes have evenly rounded ends, 

 but there appears to be a few of the filaments with the apex more or less inflated. 



Fourteen species were represented in the plankton collected by the 'Siboga', two of 

 which appear to be undescribed. It is possible that some of the forms included in the genus 



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