120 



transverse row, while every adult specimen of the fine "Siboga" material of S. affine has \- — 5 

 crystal cones in the row, and no adult specimen with 3 cones is found in the "Siboga" collection. 

 Though that character may seem to be small, I have thought it advisable to establish a new 

 species on the ''Siboga"-specimens instead of referring them as a variety to S. Stihmii. — 

 According to Chun's description and figures of the eyes in his S. inastigophoruvi this author 

 has evidently mixed together specimens of S. Su/iniii G. O. S. and S. longicorne G. O. S. 



23. Stylocheiron longicorne G. O. Sars. PI. XVI, figs. 5 a — 5 <5. 



1883. Stylocheiron longicorne G. O. Sars, Forh. Vid. Selsk. Christiania for 1883, N" 7, p. 32. 

 1885. Stylocheiron longicorne G. O. Sars, Challenger Rep. Vol. XIII, p. 144, PI. XXVII, fig. 5. 



Stat. 118. July 13. Lat. 1° 38' N., long. I24°28'.2E. Hensen vertical net, from 900 m. to 



surface. 10 specimens. 

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



to surface, i specimen. 

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



1500 m. to surface. 2 specimens. 

 Stat. 143. August 7. Lat. i°4'.5 S., long. 127° 52'. 6 E. 1454 m. Hensen vertical net, from 



1000 m. to surface. 5 specimens. 

 Stat. 185. September 12. Lat. 3°2o'S., long. I27°22'.9E. HENSEN vertical net, from 1536 m. 



to surface. 22 specimens. 

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



to surface. 39 specimens. 

 Stat. 220. November 1/3. Anchorage oft" Pasir Pandjang, West coast of Binongka. 278 m. 



Townet. I specimen. 

 Stat. 243. December 2. Lat. 4°3o'.2S., long. 129° 25' E. Hensen vertical net, from 1000 m. 



to surface. 2 specimens. 

 Stat. 276. January 9. Lat. 6°47'.5 S., long. i2S°4o'.5E. HENSEN vertical net, from 750 m. 



to surface. 3 specimens. 



Description. — The frontal plate is a rather long triangle frequently without any 

 rostrum but with the tip acute or subacute, frequently terminating in a long or very long and 

 distally extremely thin rostrum. The dorsal keel on the gastric area somewhat low. Eyes very 

 high (fig. 5«), somewhat more than twice as high as broad below the middle, with the upper 

 third nearly as broad as, or, in large females, sometimes even broader than, the lower third ; 

 the lower portion not much darker than the upper. In the female antennulae the peduncles are 

 longer than the carapace but otherwise shaped as in 5. affine\ the lower flagellum is slightly 

 longer than the upper and both are extremely thin. In the male antennulae the peduncles are 

 shaped completely as in 5. affiue\ the upper flagellum is a little longer than the peduncle and 

 somewhat shorter than the lower; both peduncles are thicker than in the female, yet very 

 slender in the whole length excepting the much thickened, very oblong-conical basal joint of 

 the lower peduncle. Antennal squama nearly as in 5. affinc, 13 to 15 times longer than broad 

 a little behind the base of the marginal tooth, in the female reaching a little beyond the distal 

 end of the second antennular joint, and in the male to the middle of third joint. 



The false cheL-e of the long legs as in S. affinc. Sixth abdominal segment from half as 

 long again to more than twice as long as deep, with the lower margin rounded flatly upwards 



