I 1 1 



1896. Nematoscelis mantis Chun, Bibl. Zoolog. Bd. 7, Heft 19, p. 165, Taf. XII. 

 1905. Nematoscelis tenella H. J. Hansen, Bull. Mus. Ocean. Monaco, N" 42, p. 30. 



Stat. 42'. April 7. Lat. 8°o'.5 S., long. ii8°34'.7E. 1600 m. Deep-sea trawl, i ovigerous 9. 

 Stat. 118. July 13. Lat. i°38'N., long. I24°28'.2E. Hensen vertical net, from 900 m. to 



surface, i specimen (9). 

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



to surface, i very large, ovigerous female. 

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



1000 m. to surface. 4 specimens (i adult cf, 3 immature specimens). 

 Stat. 143. x'^.ugust 7. Lat. i°4'.5 S., long. I27°52'.6E. 1454 m. Hensen vertical net, from 



1000 m. to surface. 5 specimens (i adult 9; 4 immature specimens). 

 Stat. 148. August 10. Lat. o°i7'.6S., long. I29°I4'.5E. 1855 m. Hensen vertical net, from 



1000 m. to surface. 4 specimens (2 adult cf , i adult O, \ immature specimen). 

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



to surface. 5 specimens (2 ovigerous 9j 3 immature specimens). 

 Stat. 203. September 19. Lat. 3° 32'. 5 S., long. 124° 15'. 5 E. Hensen vertical net, from 1500 m. 



to surface. 6 specimens (i adult cT, 5 immature specimens). 

 Stat. 230. November 14. Lat. 3°58'S., long. i28°2o'P". Plankton. 2 subadult specimens. 

 Stat. 243. December 2. Lat. 4°3o'.2S., long. i29°25'E. Hensen vertical net, from 1000 m. 



to surface. 2 adult males. 

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



surface. 2 specimens (i immature specimen, i larva). 

 Stat. 282. January 15/17. Lat. 8°25'.2S., long. i27°i8'.4E. Anchorage between Nusa Besi 



and the N.E. -point of Timor. 27 — 54 m. i very young specimen. 



Adult Specimens (figs. \a — 4//). — In the Monaco-paper quoted I gave a nearly 

 full description, consequently it may be sufficient to lay stress on some characters and to add 

 a few remarks, especially on the copulatory organs. 



The species is more slender than the preceding forms. The frontal plate with rostrum 

 (figs. 4^" and \b) about as in X. gracilis. Lateral margins of the carapace in adult specimens 

 of both sexes from the "Siboga" without denticles. The eyes dark brown or nearly black, with 

 a lighter transverse band; the upper section is much broader than the lower. In both sexes 

 all three joints of the antennular peduncles conspicuously more slender as compared with the 

 carapace than in the two preceding species, furthermore the two distal peduncular joints con- 

 siderably thicker and somewhat shorter in the male (fig. A^d) than in the female (fig. \b), while 

 the male lower flagellum has its proximal part straight as in N. inicrops. The terminal joint 

 of the elongated pair of legs (fig. 4^) is more slender than in the two preceding species, being 

 more than three and a half times as long as broad ; its largest spine distally on the posterior 

 margin with the saw-teeth fine and very distant from each other (fig. \d). 



The copulatory organs (figs. \e and 4/) essentially as in N. gracilis, but showing some 

 minor differences. The spine-shaped and the terminal processes are still more reduced, the latter 

 not longer or even shorter than the basal diameter of the proximal process ; this last-named 

 process nearly as in N. gracilis, but its distal outer margin with more saw-teeth, some of which 

 are large (fig. 4^). The lateral process long, not much shorter than the proximal, straight, 

 and its blunt, oblique end adorned with incisions looking as lines and with the margin between 

 them rounded (fig. 4 //). 



