66 ZOOLOGISCHE MED EDEELINGEN — DEEL IL 



pilose over a short region at some distance from the hook, much resembl- 

 ing the ventral bristles of the Florida-species. They are arranged in 

 three groups of different length: two dorsal ones are the longest; a median 

 group of three, that have three-quart of the length of the dorsal ones 

 and an inferior group of four, that are shorter than the median ones. 

 The ventral cirrus, tapering distally, extends beyond the extremity of 

 the neuropodium. The head is rounded, nearly as long as broad. Two 

 black eyes are situated on the lateral side of the anterior part of the 

 head and therefore have a position quite different from that in the other 

 species; the anterior ones are the largest. The facial tubercle is large, 

 pear-shaped, tuberculate. The tentacle is slender, cylindrical, nearly as 

 long as the head. The palps are not very long; bent backward they extend 

 to the sixth segment. Of the tentacular cirri the dorsal one measures 

 two thirds of the length of the palps; the ventral one is a third shorter 

 than the dorsal one. The largest specimen measures 37 mm. in length 

 and 25 mm. in breadth; the number of segments amounts to 38. 



Aphroditella sibogae n.sp. 



Siboga-expedition, Stat. 162, between Loslos- and Broken-islands, west 

 off Salawatti. 



An oval form of moderate size, entirely covered with mud, which 

 leaves only visible the short brown ventral bristles besides the slender 

 dorsal setae, that are coated with granular matter and therefore have the 

 appearance of fringes. The head is rounded trapezoidal, nearly as long 

 as broad, of a pale red tint, bearing on its anterior part two large, round 

 prominent areas, which are somewhat darker coloured and provided with two 

 small black spots. 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, reddish coloured 

 in their terminal part like the head. The ventral bristles are not very 

 long, straight, faintly S-like bent over a short distal part, that is coated 

 along one side with villous appendages, extending beyond the hooked tip, 

 like in Aphrod. intermedia (Challenger Annelida PL VIa, fig. 1); they 

 are arranged in three rows. Coarse dorsal bristles could not be observed 

 amidst the felt. The length of the unique specimen is 22 mm., its 

 breadth 15 mm. 



Aphroditella decipiens n. sp. 

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



In its external appearance as well as by the structure of its ventral 

 bristles this small worm so much resembles the preceding species, that 



