28 



second paper, while it remains uncertain whether 5. elegans Calm, is a valid species or a 

 synonym, as according to Calman's figures in his first paper its petasma seems to differ more 

 from that in the adult Sic. maldivensis than might be expected between petasma in the immature 

 and that in the adult male of the same species. It cannot be settled with any certainty whether 

 Sic. inermis Paulson is identical with Sic. maldivensis Borrad. or a separate species before new 

 specimens have been gathered in the Red Sea. 



In the "Siboga" material 2 species are found, viz. Sic. maldivensis Borrad. and a fine 

 new species; of the latter I have fortunately also a good material from the Gulf of Siam. 



I. Sicyonella nialdivcnsis Borrad. PI. II, figs. \a—\g. 



1910. Sicyonella maldivensis Borradaile, Trans. Linn. Soc. London. 2nd Ser. Zool., Vol. XIII, 

 pt 2, p. 259, PI. 16, fig. 3, la. 



1913. (?) Aphareocaris elegans Caiman, Journ. Linn. Soc. London, Zool. Vol. XXXII, p. 219, 



PI. 16, figs. I — 16. 



1914. Sicyonella maldivensis Caiman, Ann. Mag. Nat. Hist., ser. 8, Vol. XIII, p. 259, figs. A, B. 



Stat. 164. August 20. Lat. i°42'.5 S., long. I30°47'.5 E. 32 m. Sand, small stones. Dredge. 

 2 females. 



Stat. 213. Sept. 26 — Oct. 26. Saleyer-anchorage and Surroundings. Depth up to 36 m. Coral- 

 reefs, mud and mud with sand. 2 males, i female. 



Stat. 323. Febr. 24 — 25. Sangkapura-roads, Bawean-island. 12 m. Mud. 11 small specimens. 



Description. — Dorsal crest of the carapace with two acute teeth, not including 

 the short, acute rostral process. Eyes distinctly larger in the male (fig. \d) than in the female 

 (fig. A,b) ; in the female the distance from the base of the long second joint of the eye-stalk to 

 the end of the cornea is somewhat more than two and a half times as long as the breadth 

 of the cornea, while in the male the same distance is only somewhat more than twice as long 

 as the breadth of the cornea. The antennular peduncles in the female moderately long; the 

 inner margin of its two distal joints combined nearly as long as the same margin of first joint ; 

 second joint rather broad, not quite twice as long as broad, and its inner margin nearly one- 

 fourth as long again as third joint, which is somewhat slender. In the male the two distal 

 joints combined are considerably longer than in the female, with their inner margin very con- 

 spicuously longer than that of first joint; second joint is a little longer and proportionately a 

 little narrower than in the female, and its inner margin is slightly shorter than third joint, which 

 is distinctly thicker and considerably longer than in the female. The lower flagellum in the 

 male (fig. 4c) has the proximal portion widened with the lower margin somewhat convex, while 

 the upper margin is very concave excepting towards both ends of the widened portion, so that 

 in reality only the short proximal and the longer distal parts of the portion with the lower 

 margin convex are thick ; the upper margin of the curved portion is equipped with a little more 

 than twenty spines which are long on the thick parts, shorter and considerably less closely set 

 on the middle part of the concavity. — The antennal squama reaches in the female about to 

 the middle of third antennular joint, in the male rather little beyond second joint. 



First pair of legs moderately slender; fifth joint (fig. \d) is somewhat shorter than the 

 chela and has on the lower side a peculiarly shaped group of pectinate spines answering to a 



