HETERONEREIS. 113 
NOTE VIII. 
ON A REMARKABLE HETERONEREIS 
FROM THE NORTHCOAST OF EAST-JAVA 
BY 
Dr. R. HORST. 
(With 5 text-figures). 
During a night in August 1910 Mr. P. Buitendijk catched 
on the road of Panaroekan, with the pelagic net, a curious 
Heteronereis-specimen, differing from the species usually 
met with by the shape of its cephalic lobe, but agreeing 
in many regards with a similar form from the Gulf of 
California, collected in 1900 by Diguet and afterwards 
described by Gravier '). Our worm (a 9’) is rather small, 
measuring only 13 mm. in length, whereas the largest of 
the California-specimens reaches 23 mm.; the number of 
its segments amounts to 95. The body shows dorsally on 
each side a double row of black spots, consisting of a 
narrow transverse one at the base of each foot and another 
round patch on the middle of it; ventrally also there occurs 
a dark spot at the base of each foot. On the other hand 
the California-species is characterized by a dark transverse 
band about across the middle of the dorsum of each segment, 
The prostomium (figs. 1 and 2) is broadly rounded anteriorly, 
somewhat resembling the bill of a duck, with a longitudinal 
ridge along its middle. The two pairs of eyes are highly 
enlarged, close to each other. However only the posterior 
1) Bulletin du Muséum d’Hist. naturelle, t. VII, 1901, p. 177, figs. 1—11. 
Notes from the Leyden Museum, Vol. X XXIII. 
8* 
