40 



pleopods is modified in a somewhat similar way). Pseudobranchial rami of second to fourth 

 pairs of male pleopods not spirally twisted but nearly straight. 



20. Siriella cpqiiiremis n. sp. PI. Ill, figs. 4« — \c\ PI. IV, figs. \a — i /. 



Stat. 35. March 28. Lat. 8°o'.3 S., long. ii6°59'E. 1310 m. Plankton, surface. 11 specimens. 

 Stat. 66. May jIZ. Bank between islands of Bahukiwang and Tambolungan, south of Saleyer. 



8 — 10 m. Plankton, i specimen. 

 Stat. 81. June 14. Pulu Sebangkatan, Borneo-bank. 34 m. Plankton. 5 specimens. 

 Stat. 96. June 27. South-east side of Pearl-bank; Sulu- Archipelago. 15 m. Plankton, surface. 



9 specimens. 

 Stat. 99. June 28/29/30. Lat. 6°7'.5 N., long. 120° 26' E. Anchorage oft North-Ubian. 16—23 m. 



Plankton, surface. 2 specimens. 

 Stat. 117'. July 12. Lat. i°i5'N., long. i23°37'E. Townet. 12 specimens. 

 Stat. 177'. September i. Lat. 2° 30' S., long. I29°28'E. Townet. 7 specimens. 

 Stat. 194. September 15. Lat. 1° 53.5 S., long. 126° 39' E. 1504 m. Plankton. 2 specimens. 

 Stat. 194 — 197. September 15. Lat. i°53'.sS. — [°45'.3 S., long. I26'^39' E.- — 127°8'. 3 E. Plankton. 



5 specimens. 

 Stat. 245. December 3. Lat. 4° 16.5 S., long. 130°! 5'. 8 E. 4956 m. Plankton, surface. 7 specimens. 



Description. — Body moderately robust. Carapace in both sexes rather feebly produced, 

 the frontal plate being- a moderately broad, low triangle, with the end acute or subacute. Eyes 

 nearly as large as in 5. iiiornata, black. Antenaular peduncle in the male moderately slender. 

 Antennal squama in the male (PI. Ill, fig. 4^) a little more, in the female (fig. 4^) a little less, 

 than three and a half times as long as broad; the terminal lobe in both sexes much broader 

 than long. Gnathopods (PI. IV, fig. i a) proximally perceptibly, distally much thicker than first 

 pair of thoracic legs (fig. i d)^ the sixth joint of which is slender with a conspicuous transverse 

 articulation ; second and third pairs of thoracic legs slightly longer than the first pair. 



Pseudobranchial rami on second to fourth pairs of male pleopods nearly straight and 

 either short, reaching the end of the first third of the endopod (figs, ic — \e), or of moderate 

 length, reaching to the middle of the endopod (fig. i_^). Rami of second or third pair of male 

 pleopods similar in length and terminating in the usual feathered setae (fig. ic). Fourth pair of 

 male pleopods (figs. \c and i^) with the exopod normal and terminating in .slender, feathered 

 setae, and the endopod somewhat elongated, conspicuously longer than the exopod ; the terminal 

 and the penultimate joints of this endopod each with two robust, firmly chitinised, naked, spini- 

 form seta;, the terminal outer setae from a little more than one-third to half as long again as 

 the inner terminal .seta, the inner somewhat curved seta of the penultimate joint reaching to the 

 end of or a little overreaching the inner terminal somewhat curved seta, and the outer seta of 

 the penultimate joint reaching to the end of or overreaching a little the outer terminal seta. 



Uropods rather slender (figs, iz" and i/), with the endopod reaching about or generally 

 quite to the end of the exopod; the exopod slightly narrower in the male (fig. i/) than in the 

 female (fig. i/), with 8 — 12, most frequently 9 — 10, spines occupying more than half of the 

 outer margin of the proximal joint, because the proximal spines are proportionately distant from 

 each other, while the distal joint is a little more than half as long as the proximal joint and 

 slightly more than twice as long as broad. Telson (figs, i / and i k) nearly three times as long 



