50 

 3- Aphroditclla siboo;ac Horst. PI. XI, figs. S — lo. 



Horst, Zool. Mededeel. R. Museum Nat. Historie, Leiden, vol. II, 1916, p. 66. 



Stat. 162. Betvveen I.oslos and Breken Islands, West ofit" Salawatti. Depth 18 M. i specimen. 



Length 22 mm., breadth 15 mm. 



An oval form of moderate seize, entirely covered with mud, that leaves only visible the 

 short brovvn ventral bristles besides the slender dorsal setae that are coated with eranular 

 matter and therefore have the appearance of fringes. The head is rounded trapezoidal (PI. XI, 

 fig. 8), nearly as long as broad, of a pale red tint, with two large, round, prominent areas on its 

 anterior part, that are somewhat darker coloured and bear two small black .spots (eyes.?). A 

 small tentacle, not as long as the head, arises from the middle of the frontal margin; beneath 

 it a wedge-shaped facial tubercle is situated. The palps are rather long, tapering distally, 

 in their terminal part reddish coloured like the head. The ventral bristles (PI. XI, figs. 9 and 

 10) are not very long, straight, faintly -S-like bent over a short distal part, that is coated 

 along one side with villous appendages, that in the longer ones extend beyond the hooked tip, 

 like in Aphrod. i?itermedia (Challenger Annelida, PI. VI -'^, fig. 1); they are arranged in three 

 rows. Coarse dor.sal bristles could not be observed amidst the feit. 



4. Aphroditella decipiens Horst. Pi. XI, figs. 11 and 12. 



Horst, Zoolog. Mededeel. R. Museum Nat. Historie. Leiden, Vol. II, 1916, p. 66. 

 Stat. 51. Molo Strait. Depth from 6g to 91 M. i specimen. 



Length about 10 mm., breadth 8 mm. Number of segments nearly 30. 



In its external appearance, as well as by the structure of its ventral bristles this small 

 worm so nuich resembles the preceding species {Aphrod. sibogae), that I first believed it to 

 be identical ; however a closer examination revealed some differences especially in the struc- 

 ture of the head, so I think it to belong to an other species. 



The head is broadly oval, somewhat resembling that of Aphrod. alta (Kinberg, (Annu- 

 lata, PI. I, fig. i) and bears in his anterior part on each side two small black eyes, situated 

 close behind each other on a faintly globular area (PI. XI, fig. 11). 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 (PI. XI, fig. 1 2) have a conspicuous hook-like tip ; beneath it over a .short 

 region the bristle is densely villose and in some of them that region is continued and projects 

 as a pilose [jrocess beyond the hook, like in Aphrod. interniedia (Challenger Annelida PI. VI ••^, 

 fig. i). There are seven ventral bristles, arranged in three groups of different length. 



5. Aphroditclla uiongolica Horst. PI. XI, figs. 13 — 16. 



Horst, Zoolog. Mededeel. R. Museum Nat. Historie. Leiden, Vol. II, 1916, p. 6j. 



Stat. 105. 6°8' Lat. N., I2i° 19' Long. E. North oft" Sulu Island. Depth 275 M. 2 specimens. 



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