i8 



the preceding species, besides the hooks along the outer and the distal margins are a little 

 smaller and a little more numerous, and the hooks in the longitudinal row on the anterior side 

 (fig. 6g) are considerably smaller. The inner proximal bend on lobus terminalis (//.) is more 

 produced almost as a low and broad protuberance. The inner one of the accessory lobes 

 (fig. 6^^', lac.) is short and thick. 



Remarks. — It may be seen that the two really valuable specific differences between 

 S. fulgens and 6". Challengeri are the size of the adults and the shape of third joint in the 

 male antennular peduncles. But this joint differs strongly in the two forms, and as no inter- 

 mediate form has been observed the character must be of specific value. In my description of 

 S. splendcns (manuscript on the 'Talisman' Sergestidae) I have pointed out that the same third 

 joint in this species differs rather little from that in the female, as it has no process directed 

 downwards, furthermore that the lower antennular flagellum in the male has its jaroximal part 

 somewhat feebly thickened with a rather small and distally rounded protuberance on second 

 joint, thus the whole structure differing widely from what is found in S. Challengeri and 5. 

 fulgens, but somewhat similar to the above-mentioned indeterminable male from "Siboga" 

 Stat. ICO. In the French paper I have also described and figured the ventral side of the four 

 posterior thoracic segments of the female, showing the adornment of the antepenultimate seg- 

 ment between the coxre, and pointing out that a similar structure is found in 5. Challengeri 

 and S. fulgens, but that in these the keels, and especially the two posterior protuberances, are 

 less developed than in S. splendeus, differences not easy to use as characters and scarcely 

 possible to figure accurately. Finally the petasma of S. ftclgens difters from that in S. splendens 

 in some minor particulars, among which those found in the shape of lobus terminalis are 

 perhaps the most important. 



7. Sergestes se7ninudus n. sp. PI. I, figs. 7« — 7^; PI. II, figs. \a — \f. 



Stat. 66. May 7 — 8. Bank between islands of Bahuluwang and Tambolungan, south of Saleyer. 



8 — 10 m. Plankton. 6 Mastigopus. 

 Stat. 144. August 7 — 9. Anchorage north of Salomakiee-(Damar-)island. 45 m. Plankton. 



6 Mastigopus. 

 Stat. 148. Aug. 10. Lat. o°i7'.6S., long. 129° 14'. 5 E. Hensen vertical net, from 1000 m. 



depth to surface. 4 specimens (i is an adult male). 

 Stat. 157. Aug. 15 — 16. Lat. o°32'.9S., long. I30°I4'.6E. 45 m. Plankton, i Mastigoptis. 

 Stat. 168. Aug. 22 — 23. Anchorage North of Sabuda-island. 63 m. Surface, i Mastigopus. 

 Stat. 177''. Sept. I. Lat. 2°3o'S., long. I29°28'E. Townet. i Mastigopus, 3 Acanthosonia. 

 Stat. 185. Sept. 12. Lat. 3°2o'S., long. i27°22'.9E. Manipa-strait. Hensen vertical net, from 



1536 m. to surface. 3 males, i large female. 

 Stat. 189a. Sept. 12. Lat. 2°22'S., long. I26°46'E. Townet. i Mastigopus. 

 Stat. 194-197. Sept. 15. Lat. 1° 55'-i°45'.3 S., long. 126° 39'- 127° 8'. 3 E. Plankton, i Mastigopus. 

 Stat. 203. Sept. 19. Lat. 3° 32^5 S., long. 124° 15'.$ E. Vertical net from 1500 m. depth to 



surface, i young specimen, i Mastigopus. 

 Stat. 223. Nov. 6. Lat. 5° 44^7 S., long. 126° 27'. 3 E. Surface, i Mastigopus. 

 Stat. 230. Nov. 14. Lat. 3°58'S., long. 128° 20' E. Hensen vertical net, from a depth of 



2000 m. to surface, i adult male. 

 Stat. 276. Jan. 9. Lat. 6° 47. 5 S., long. i28°4o'.5 E. Hensen vertical net, from 750 m. to 



surface, i Mastigopus. 



