lO 



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

 1500 m. depth to surface, i adult male. 



Stat. 230. Nov. 14. Lat. 3° 58' S., long. i28°2o'E. Hensen vertical net, from a depth of 

 2000 m. to surface, i adult female. 



This species is somewhat small; the largest "Siboga" specimen, the female, is 26 mm. 

 long, and the adult male a little smaller. The body is somewhat thick, the legs moderately 

 short and a little robust. It has on the whole been well described by Kemp, but the eyes and 

 their stalks do not agree fully with his figures, and besides some particulars and especially a 

 representation of the petasma must be added. 



The carapace and its rostrum has been fully described by Kemp; it may be noted, that 

 the distal part of the rostrum, beyond the dorsal tooth, is more straight in my animals than 

 figured by him. His description and figures of the eyes disagree somewhat with my specimens-, 

 the eyes are in both se.xes conspicuously larger than figured by Kemp and considerably broader 

 than their stalks, somewhat broader than deep; besides the cornea is as long as the outer 

 margin of the distal joint of the stalk; the protuberance at the inner margin of the stalk near 

 the cornea is a little conical, quite low, and broadly obtuse. — Kemp's statement that in the 

 antennulse the third joint of the peduncle is slightly longer than the second does not agree 

 with his fig. 3, as the inner proximal part of second joint must be counted; in reality second 

 joint is in the female a little longer than the third, and in the male the difference in length 

 is still more conspicuous; besides the second joint is somewhat thicker in the male than in the 

 female, while there is considerable difference in the third joint between the sexes, as in the 

 female it is about as broad as deep, while in the male it is a little obliquely compressed, seen 

 from above as broad as in the female, but much deeper than broad. The two proximal joints, 

 and especially the first joint, of the clasping organ in the male are short and somewhat thick, 

 but the organ is unfortunately rather mutilated. The antennal squama has its rather narrow- 

 end more transverse and the outer terminal tooth longer than in Kemp's fig. 3 ; the squama 

 has numerous small darker dots arranged in its whole length in a straight line a little nearer 

 to the inner than to the outer margin. 



To Kemp's description of the appendages may be added that third pair of maxillipeds 

 is a little shorter and more slender than third pair of legs ; in the only maxilliped not nmtilated 

 I was unable to detect any subdivisions of the terminal joint. Fourth pair of legs, when directed 

 forwards, reaches slightly beyond the end of the rostrum ; their two distal joints are somewhat 

 broad, the terminal one being scarcely five times as long as broad ; fifth pair of legs about 

 half as long as the fourth. As to the branchiae and the uropods is referred to Kemp. 



The petasma (figs. 2a — 2c) is very characteristic. Lamina externa ijai/i.) of pars externa 

 is short, much shorter than processus uncifer {pti.) and has its outer margin concave at the 

 middle ; the process named differs from that in other forms by the shape of the subterminal 

 incision, which in S. Gardineri is longer than deep, while in other species it is narrow, deeper 

 than long. Processus basalis {ph^ is very broad, moderately long, distally very broadly rounded. 

 Pars media is moderately robust at the middle. Processus ventralis (/z^.) is long, curved, scarcely 

 tapering from somewhat from the base to the end, which is cut off obliquely and equipped 



