i77 



a third ; at the other side, however, the two form a group as usual, and the third is of the size 

 of the other spines of the middle part of the edge. There is a very small notch behind the 

 upper pair and the number of spines on the middle part is 3 and 4 respectively. 



O u t e r m a x i 1 1 a e have the outer lobe elongated, and this lobe bears hairs only on 

 the distal part of the surface. A single row of hairs is disposed in longitudinal direction on 

 the outer lobe, running towards the outer margin of the inner lobe. Inner parts of inferior lobe 

 furnished with numerous hairs directed inwards and towards the basis of the maxilla. 



Cirri. First pair has unequal rami of 7 and 11 segments. The segments are not 

 strongly protuberant on their inner face. 



Second pair, rami slightly unequal of 6 and 7 segments. 



Third pair (PI. XV, fig. 7), rami somewhat unequal, of 7 to 8, and 8 to 9 segments. 

 The segments are protuberant on their inner face. On most segments a few small teeth are 

 seen between the hairs disposed on the protuberances. They seem to occur on both rami; 

 they are more distinct, however, on the longer ramus. 



Fourth pair, rami nearly equal of 10 and 11 segments: remarkably short. 



Sixth pair (PI. XV, fig. 8), has rami of 16 and 17 segments. Greatest number of pairs 

 of spines on inner face of segments : five. Spines are disposed on the dorsal surface of each 

 segment, and form a little tuft close to its upper margin. One of these spines is longer than 

 the others, and about half as long as the segment. 



Penis broken off, not seen. 



Eggs in the interior of the shell-cavity rather numerous, egg-lamellae broken, present 

 in both specimens. Larvae with Nauplius-appendices and eyes seen in the eggs. Greatest 

 diameter of eggs about 0.24 mm. 



The two specimens of this small species were observed at : 



Stat. 97. June 28, 1899. Lat. 5 4S7 N., Long. U9°49'.6E. N. E. of Sulu-Archipelago. Depth 

 564 m. Bottom : coarse, coral-sand. 



General Rem ark s. This species in several respects approaches B. amphitrite, but is 

 distinguished at once from that species by the structure of the scutum, which, in this species, 

 has no adductor ridge. The shape of the parts of the mouth and of the cirri resembles that 

 of the same parts in B. amphitrite. There might be, perhaps, sufficiënt reason to consider this 

 new species as the deep-sea form of Darwin's species. Under B. minutus which seems to belong 

 to the same group, I point out the differences between that species and the present one. 



4. Ba/anus minutus n. sp. PI. XV, fig. 9 — 16. 



Shell of a pink colour with reddish stripes, radii broad, with their summits oblique. 

 Scutum without adductor ridge, and with prominent articular ridge ; tergum with the spur pointed 

 at the extremity. Labrum with three teeth on each side of notch, palpi with the hairs on the 

 outer surface not disposed in a distinct longitudinal series. 



This almost microscopic species is represented by a single specimen. It is attached to 

 a jointed thread which belongs to a Crinoid. lts shape (PI. XV, fig. 9) is conical, and it 



49 



SIBOGA-F.XPEDITIE XXXI*. 



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