89 
Scolectthricella in this report, will be removed to other genera when complete information 
regarding the two sexes becomes available. 
1. Scolectthricella abyssalis (Giesbrecht). 
Scolecithrix abyssalis Giesbrecht, 1888, p. 338. 
Scolecithrix abyssalis Giesbrecht, 1893, p. 266, pl. 13. 
Scolecithrix tumida T. Scott, 1893, p. 52, pl. III, figs. 33—38. 
Scolecithrix abyssalis Giesbrecht & Schmeil, 1898, p. 43. 
Twenty females belonging to this species were obtained from the plankton collected at 
the following stations. 
Stat. 141 (1500 metres to surface), 3 specimens. — Stat. 142, 1 specimens. — Stat. 143 
(1000 metres to surface), 2 specimens. — Stat. 185 (1536 metres to surface), 3 specimens. — 
Stat. 203 (1500 metres to surface), 4 specimens. — Stat. 230 (2000 metres to surface), 4 
specimens. — Stat. 243 (1000 metres to surface), 2 specimens. — Stat. 276 (750 metres to 
surface), I specimen. 
Scolectthricella abyssalis appears to be closely related to Scolectthricella vittata, but can 
be separated from it by the proportional length of the spines on the female fifth feet. The spine 
on the inner margin of the free joint is longer than the apical one. In Scolecethricella vittata 
the apical spine is much longer than the one on the inner margin. 
The form from the Gulf of Guinea plankton described by my father as Scolecdthrix 
tumida appears to be identical with GrrsBRECHT’s species. 
This species has only previously been recorded from the Pacific Ocean, the Gulf of 
Guinea, and the Farée Channel. The male is unknown. 
2. Scolecithricella auropecten (Giesbrecht). 
Scolecithrix auropecten Giesbrecht, 1893, p. 266, pls. 13 & 37. 
Scolecithrix auropecten Giesbrecht & Schmeil, 1898, p. 45. 
Scolecithrix auropecten 1. C. Thompson, 1903, p. 20. 
Scolecithrix auropecten Thompson & Scott, 1903, p. 245. 
Scolecithricella auropecten Sars, 1907(a), p. 16. 
Scolecithrix auropecten van Breemen, 1908, p. 74, fig. 86. 
Two females were found in the plankton collected with the HENsEN vertical net at the 
following two stations. 
Stat. 118 (900 metres to surface). — Stat. 148 (1000 metres to surface). 
The free joint of the female fifth feet is very small and narrow, and it is furnished 
with two apical spines. The inner spine is considerably longer than the outer one. 
The distribution of the species appears to be limited and the male is unknown. 
3. Scolecithricella bradyz (Giesbrecht). 
Scolecithrix bradyz Giesbrecht, 1888, p. 337. 
Scolecithrix bradyt Giesbrecht, 1893, p. 266, pls. 4, 13, 37- 
Scolecithrix bradyt T. Scott, 1893, p. 51, pl. V, figs. 2939. 
Scolecithrix bradyi Giesbrecht & Schmeil, 1898, p. 42. 
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SIBOGA-EXPEDITIE XXIX@. 
