's RIJKS MUSEUM .VAN NATUURLIJKE HISTORIE — LEIDEN. 75 



are provided with a dense beard of fine pinnae, separated by a short 

 interval from the spine beneath them. The ventral side of the body is 

 beset with scattered small papillae, that do not cover the whole parapodium 

 (as in Laetm. rug osa) but extend only over the proximal half of it, 

 where the ventral cirrus arises. Xo dorsal felt occurs. There are 15 pairs 

 of rather large elytra, overlapping each other and totally covering the 

 dorsum. 



Laetmonice breve-pinnata n. sp. 



Siboga-expedition, Stat. 311, Sapeh-bay, east-coast of Soembawa. 



At the above-named station a small Laetmonice (a young one?) was 

 collected, that can easily be recognised by the appearance of its 

 ventral bristles; for instead of the beard of long pinnae, inserted 

 on the tip of these bristles, there is a group of short cirri sepa- 

 rated by a rather large interval from the spine beneath 

 them and in this interval there occur three or four smaller 

 spines. The tip of the neuropodium bears a small curved appendix; the 

 ventral cirrus, that measures two thirds of the length of the neuropodium, 

 is swollen over the greater part of its length, but its distal extremity is 

 filiform. All the large dorsal bristles are wanting, but a smaller one of 

 them shows three pairs of fangs, the inferior of which is the longest. 

 No dorsal felt occurs. There are 15 pairs of rather large elytra, over- 

 lapping each other in the median dorsal line and totally covering the 

 dorsum. The median ventral region is smooth, translucent. The head is 

 rounded, broader than long, with two short globular eye-peduncles ; no 

 eyes were visible. The tentacle is about half as long as the palps; its 

 basal part is rather large, somewhat longer than the eye-peduncles, 

 whereas its distal joint is slender, with elongated, clavate tip. The palps 

 are long, extending to the 10th segment. 



The specimen measures 25 mm. in length, whereas the number of its 

 segments amounts to 35. 



Laetmonice batheia n. sp. 



Siboga-expedition, Stat. 221, South-east off Binongka-island ; depth of 

 2798 m. 



This species is especially characterised by its translucent body 

 and by its long dorsal bristles, some of which are longer than 

 the body and extend a great deal beyond its anal extremity. They are 

 golden-yellow, with a dark coloured tip and the whole surface of their 

 shaft is beset with scattered, acute tubercles. There are three pairs of 

 fangs, not very large, triangular, the inferior of them being the largest. 



