's RIJKS M USEUM VAN NATUURLIJKE HIS TORIE — LEIDEN. 67 



I first believed it to be identical; however a closer examination revealed 

 some differences especially in the structure of the head, so I think it to 

 belong to another species. The head is broadly oval, somewhat resembling 

 that of Aphrod. alta (Kinberg, Annulata, PL I, fig. 1) and bears in its 

 anterior part on each side two small black eyes, situated close behind 

 each other on a faintly globular area. The tentacle is slender, filiform, 

 somewhat longer than the head; the facial tubercle is pear-shaped, with 

 a short stalk. The palps are not very long, rather stout in their basal 

 part, tapering distally. The ventral bristles have a conspicuous hook-like 

 tip; beneath it over a short region the bristle is densely villous and in 

 some of them that region is continued and projects as a pilose process 

 beyond the hook, like in Aphrod. intermedia (Challenger Annelida, PI. VIa, 

 fig. 1). There are seven of them, arranged in three groups of different length. 

 Length of the specimen 'about 10 mm., breadth 8 mm.; number of 

 segments nearly 30. 



Aphroditella mongolica n. sp. 



Siboga-expedition, Stat. 105, north off Soeloe-island. 



In this species some of the coarse dorsal bristles pierce the thick 

 dorsal felt with their distal end; they are not very stout, brown yellow, 

 densely covered with small tubercles or spines and terminating in an 

 uncoloured, vitreous hook-shaped extremity. The ventral bristles are pale- 

 brown coloured, faintly S-like bent in their distal part and provided with 

 a villous beard at some distance from the end, like in Aphrod. malayana 

 and -obtecta\ they are arranged in rows as usually. The head is heart- 

 shaped, provided with a tentacle, that consists of a thick basal part, 

 measuring about a third of the length of the head and of a slender distal 

 joint, nearly as long as the head. In its anterior part there occur on 

 each side a pair of semilunar eyes, situated on a prominent elliptical area. 

 The facial tubercle has the shape of a pine-apple and is nearly of the 

 same length as the head. The palps are glossy, stout, not very long, 

 tapering distally and beset with fine, spinous papillae, only visible by 

 high power. The length of the worm is about 25 mm.; its breadth 12 mm. 



Aphroditella floresiana n. sp. 



Siboga-expedition, Stat. 51, Molo-strait. 



The body of this worm in its anterior and posterior region is acumi- 

 nated; its dorsum is coated with a thick felt, through which the dorsal 

 bristles penetrate. However these bristles are not prominent, but with 

 their strongly curved or knee-like bent distal end lie in tranverse rows 

 down on the back; their distal half is paler coloured, densely covered 



