22 



S. rubro-gttttatus Wood-Mason belongs to S. corniculum ; which consequently is found at least 

 in the more western part of the Indian Ocean. 5". corniculum Kr., which was established on 

 specimens in the Jl/asiigoptts-stage from the tropical Atlantic, is common at least in the northern 

 subtropical area of that ocean, and judging from its Mastigopus it is known from lat. 42 N. 

 to lat. 30 S. In 1896 I wrote that I had seen specimens of S. corniculum from the Indian 

 Ocean and ranging into the Pacific to the Matelota island and to lat. i6°7o'N., long. i32°E.; 

 these specimens were either Masiigopus-forms or quite young animals with black eyes, but as 

 the adult males from the "Siboga" belong to the hitherto unknown species S. semimidus, and 

 as I think it nearly impossible to separate young specimens or Masiigopzis-stages of this species 

 from those of S. corniculum, the statements quoted on the distribution in the Indian Ocean 

 and the Pacific show only the distribution of this tribe consisting of two species, and at least 

 the major part or perhaps nearly all of the specimens in question belong in all probability to 

 5. seminudus. 



Species of Group II. 

 8. Sergestes orientalis n. sp. PI. II, figs. ia — 2q. 



Stat. 2>7- March 30—31. Sailus Ketjil, Paternoster islands. 27 m. and less. Surface. 5 Mastigopus. 

 Stat. 40. April 2. Anchorage off Pulu Kawassang, Paternoster islands. 12 m. Tovvnet. 2 Masti- 

 gopus. 

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



8 — 10 m. Plankton. 1 young specimen, 7 Mastigopus. 

 Stat. 96. June 27. South-east side of Pearl bank, Sulu-archipelago. 15 m. Townet, surface. 



2 Mastigopus, 1 Acanthosoma, 1 Elaphocaris. 

 Stat. 106. July 4. Anchorage off Kapul-island, Sulu-archipelago. 13 m. 1 Mastigopus. 

 Stat. 118. July 13. Lat. i°3S'N., long. i24°28'.2E. Hensen vertical net, from 900 m. to 



surface. 1 specimen. 

 Stat. 125. July 18—19. Anchorage off Sa wan, Siau-island. 27 m. Plankton. 1 Mastigopus. 

 Stat. 128. July 22. Lat. 4°27'N., long. I25°25'.7E. 1645 m. Hensen vertical net, from 700 m. 



to surface. 2 Mastigopus. 

 Stat. 131 — 133. July 25. About lat. 5 $6'. 7 N., long. I26°25'E. Plankton. 1 Mastigopus. 

 Stat. 141. August 5. Lat. i°o'.4S., long. I27°25'.3E. 1950 m. Hensen vertical net, from 



1500 m. depth to surface. 1 specimen. 1 Mastigopus. 

 Stat. 143. Aug. 7. Lat. i°4'.5 S., long. i27°52'.6E. 1454 m. Hensen vertical net, from 1000 m. 



to surface. 4 specimens, 1 Mastigopus. 

 Stat. 144. Aug. 7 — 9. Anchorage North of Salomakiee-(Damar-)island. 45 m. Plankton. 4 



Mastigopus. 

 Stat. 146. Aug. 9. Lat. o° 36' S., long. I28°32'.7E. 512 m. Tovvnet, surface. 1 specimen, 1 



Mastigopus. 

 Stat. 148. Aug. 10. Lat. o° if.6 S., long. I29°I4'.5E. 1855 m. Hensen vertical net, from 



IOOO m. depth to surface. 8 specimens, 1 Mastigopus. 

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

 Stat. 168. Aug. 22 — 23. Anchorage North of Sabuda-island. 63 m. Townet, surface. 2 Mastigopus. 

 Stat. 172. Aug. 26 — 28. Gisser, anchorage between this island and Ceram-Laut. 18 m. Plankton. 



1 Mastigopus. 

 Stat. 177a. Sept. 1. Lat. 2°3o'S., long. I29°28'E. Townet. 1 young specimen, 20 Mastigopus 



and Acanthosoma. 

 Stat. 185. Sept. 12. Lat. 3 20' S., long. I27°22'.9E. Hensen vertical net, from .1536 m. 



depth to surface. 4 specimens, 4 Mastigopus. 



