2i. Stylocheiron microphthalma n. sp. PI. XVI, figs. 3a — 30?. 



Stat. 104 — 10S. July 2 — 5. Ab. Lat. 6° 1' — 6° 10' N., long. 120 — I2i'/., E. Surface. 3 speci- 

 mens (9). 



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

 to surface. 19 specimens (cf 1 , 9)- 



Stat. 129. July 22 23. Anchorage offKawio- and Kamboling-islands, Karkaralong-group. 23 — 3 1 m. 

 Tovvnet. 1 specimen (9). 



Stat. 184. September 11/12. Anchorage off Kampong Kelang, South coast of Manipa-island. 

 36 m. Townet, surface. 1 specimen (9)- 



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

 to surface. 2 specimens (9). 



Description. — Frontal plate rather long, in the female produced into a long, 

 proximally somewhat broad, distally very slender rostrum, while in the male the rostrum is 

 short (tig. 3«). The dorsal keel on the gastric area moderately high, anteriorly very sloping 

 (fig. 3#). The eyes are small, conspicuously smaller than in S. iusulare or S. affine and much 

 smaller than in S. longicorne, somewhat pyriform, from slightly more to somewhat less than 

 twice as high as broad ; the upper half is nearly conical with the narrow, obtuse end, seen from 

 the side (fig. 3 a), showing only two terminal facets; the lower part is dark. Antennulae in the 

 female nearly as in 5". longicorne, but the peduncle is only as long as the carapace with the 

 rostrum, and its second joint is longer than in S. insulare, shorter than in 5. longicorne in 

 proportion to the third joint, the latter being one-third or a little more than one-third as long 

 again as the second; the flagella as in S. affine (see below). In the male the two distal pedun- 

 cular joints of the antennulae are somewhat shorter and much thicker than in the female, shaped 

 nearly as in the male of 5. affine (fig. 4a), consequently conspicuously longer and less thick 

 than in 5. insulare ; furthermore the upper flagellum is distinctly shorter than the peduncle and 

 somewhat shorter than the lower, and both flagella are 8-jointed, with the clistal half conspi- 

 cuously expanded and on the whole similar to those in S. affine (see below and fig. 4 a). The 

 antennal squama (fig. 3^) about twelve times as long as broad just behind the marginal tooth, 

 with the terminal lobe beyond that tooth much longer than broad, reaching in the female 

 slightly beyond the middle of third joint in the antennular peduncle, in the male nearly to the 

 end of that joint. 



The false cheke on the end of the long legs nearly as in S. iusulare, differing mainly 

 by having the proximal spine of the penultimate joint and the two proximal spines at the upper 

 margin of the last joint a little longer than in that species. Sixth abdominal segment (fig. 2> c ) 

 from a little more to a little less than half as long again as deep, with the lower margin 

 curved moderately strongly upwards towards the end, but less strongly than in 5. insulare. 

 The endopod of the uropods very slightly longer than the exopod, reaching the middle between 

 the end of the telson and the insertion of its distal long spines. 



The copulatory organs (fig. 3 d) show some minor differences in the shape of the three 

 broader processes from those in allied species. The terminal process is not fully three times as 

 long- as broad, decreasinor somewhat in breadth from the base to near the end, which is broadly 

 rounded on the inner side, while a slightly protruding angle is formed by the outer and the 



