8 9 



Scolecithricella in this report, will be removed to other genera when complete information 

 regarding the two sexes becomes available. 



i. Scolecithricella abyssalis (Giesbrecht). 



Scolecithrix abyssalis Giesbrecht, 1888, p. 338. 

 Scolecithrix abyssalis Giesbrecht, 1893, p. 266, pi. 13. 

 Scolecithrix tutnida T. Scott, 1893, p. 52, pi. 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), 1 specimen. 



Scolecithricella abyssalis appears to be closely related to Scolecithricella 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 Scolecithricella 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 Scolecithrix 

 tiimida appears to be identical with Giesbrecht's species. 



This species has only previously been recorded from the Pacific Ocean, the Gulf of 

 Guinea, and the Faröe Channel. The male is unknown. 



2. Scolecithricella auropecten (Giesbrecht). 



Scolecithrix auropecten Giesbrecht, 1893, p. 266, pis. 13 & 37. 

 Scolecithrix auropecten Giesbrecht & Schmeil, 1898, p. 45. 

 Scolecithrix auropecten I. 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, flg. 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. 14S (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 bradyi (Giesbrecht). 



Scolecithrix bradyi Giesbrecht, 1888, p. 337. 

 Scolecithrix bradyi Giesbrecht, 1S93, p. 266, pis. 4, 13, t,/. 

 Scolecithrix bradyi T. Scott, 1893, p. 51, pi. V, figs. 29 — 39. 

 Scolecithrix bradyi Giesbrecht & Schmeil, 189S, p. 42. 



89 



SIBOGA-EXrEDITIE XXIX 17. 



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