lO^ 



and narrow. The segments bear numerous spines all over the surface and also 3 to 5 pairs of 

 longer ones along the anterior margin. 



The cirri of the 3"! to 6'i' pair have extremely elongate and narrow rami. Those 

 of the 6'h pair have rami of about 23 segments, which are all long and narrow but of which 

 the middle ones (from the S'^—ig"') are by far the longest and bear the greatest number 

 (5 pairs) of spines along the anterior margin. 



Caudal appendages elongate, narrow, reaching to the end of the pedicel of the 

 si.xth cirrus, composed of five cylindrical segments, each having a few long hairs at the e.xtremity. 

 At the end of the fifth segment half a dozen hairs are planted, three of which are vevy long 

 and measure about the length of the three last segments of the caudal appendage. 



No trace of a penis. 



The specimen I investigated was furnished with a cluster of eggs attached to the inner 

 side of the sac or mantle ; the animal was not in a good state of preservation, and I can only 

 say that the eggs seemed to form but one cluster. There were in all 53 eggs, the size of which 

 was about 0,5 X 0,33 mm., their .shape being oval. The colour of the (preserved) eggs was 

 dark orange. The yolk of these eggs was composed of rather large spherical globules. 



I observed two small males, one on each side at the ordinary place. They were in 

 a bad state of preservation. Their length was 0,8 mm., they were more than twice as long as 

 broad. The little animals were, however, distinctly shrivelled, therefore narrower, most probably, 

 than they would be in the living condition. Round the opening giving entrance to the sac four 

 small calcareous plates were observed, two small and two slightly larger, all of them of oval 

 shape. The rest of the surface is covered with very minute spine-like hairs which are placed in 

 transverse rows. The prehensile antennae are attached -at about one third the length of the 

 animal from the peduncular pole. 



This species was collected by H. M. S. "Siboga" at: 



Stat. 211. Septbr. 25, 1899. Lat. 5°4o'.7 S., Long. I20°45'.5 E. Depth 1158 m. Bottom: coarse 

 grey mud. 



Observation. This species is nearly related to Sr. obesiLiii\ the form of the capitulum 

 as a whole and the greater height of the valves of the lower whorl, together with the different 

 shape of the peduncle and its scales make it necessary to consider them as different species. 

 The present species also shows affinit)' to Sc. incertiiin and to Sc. arciiatiim^ which, however, 

 are both species with a rostrum. 



30. Scalpelbtin elegans n. sp. PI. \TII, fig. 9. 



Valves (14) 13, covered here and there by membrane, beautifully striated. Carina simply 

 bowed, with the umbo at the apex and a flat roof bordered by ridges. Upper latus trapeziform. 

 Valves of the lower whorl well-developed, with exception of the narrow, triangular infra-median 

 latus. Rostrum hardly visible, represented by an extremely narrow streak. Umbo of the carinal 

 latus a little below the middle of the nearly straight carinal margin. 



This beautiful species is represented by one specimen only. 



107 



