'4" 



The male can readily be separated from the males of the other species, by the elongate 

 and very pointed apex of the last joint of the exopodite of the left fifth toot, and by the long 

 curved spine on the outer distal half of the joint (Plate XLVI, fig. 14). 



Length — female, 2,6 mm., male 2,45 mm. 



The male described by the late I. C. Thompson (1903) as Phyllopus bidentatus, is 

 identical with the male of the present species. The figures of the male fifth pair given by 

 Wolfexdex ( 1 904) and vax Breemex (1908) as Phyllopus bidentatus are the same as that of 

 the male of Phyllopus helgae Farran. 



3. Phyllopus impar Farran. Plate XLV, figs. 10 — 18. 



Phyllopus bidentatus T. Scott, 1893 (pars), p. 74, pi. VI, fig. 28. 

 Phyllopus bidentatus Farran, 1905 (pars), p. 45, pi. XI, fig. 20. 

 Phyllopus impar Farran, 190S, p. 84, pi. IX, fïgs. I — 4. 



Three females and two males that are clearly identical with this species were obtained 

 from the plankton collected with the Hexsex vertical net at the following stations. 



Stat. 128 (700 metres to surface), one female and one male. — Stat. 141 (1500 metres to 

 surface), one female. — Stat. 143 (1000 metres to surface), one female and one male. 



The two sexes have a general resemblance to those of Phyllopus bidentatus. The female, 

 however, is easily separated by the genital segment appearing greatly infiated on each side 

 when viewed from above, and by the character of the serration of the apical joint of the 

 exopodite of the fifth pair of feet. The teeth are arranged in pairs. The outer tooth of each 

 set is decidedly larger than the inner one (Plate XLV, fig. 15). The terminal joint of the left 

 exopodite of the male fifth pair has the outer margin distinctly angled at the middle. The 

 outer distal curved spine on this joint is proportionally shorter than in the males of Phyllopus 

 bidentatus or Phyllopus helgae (Plate XLV, fig. 18). 



Length — female 3 mm., male 2,7 mm. 



The fifth pair of feet shewn on plate VI in the report 'On Entomostraca from the Gulf 

 of Guinea', and identified by my father as that of Phyllopus bidentatus Brady, is undoubtedly 

 identical with the female fifth pair of Phyllopus impar Farran. 



This species has hitherto only been known from the Atlantic Ocean. 



4. Phyllopus giesbrechti nov. sp. Plate XLVI, figs. 1 — 6. 



Phyllopus bidentatus Giesbrecht, 1893, p. 419, pis. 18 & 38. 



Phyllopus bidentatus Giesbrecht & Schmeil, 1S98 (pars), p. 124. 



Phyllopus bidentatus Esterly, 1905, p. 191. fig. 43. 



Phyllopus bidentatus van Breemen, 190S (pars), p. 143, fig. 161 [a — b). 



Female — length 2,8 mm. 



Viewed from above. this species has a general resemblance to Pliyllopus bidentatus 

 Brady. The last thoracic segment is considerably produced, but the distal ends are only very 

 slightly asymmetrical. The distal end of the right side has a small notch. It is not lamelliform. 

 Seen from the side, the produced ends of the last thoracic segment are narrowly rounded at 



140 



