20 Annelida Ghoetopoda 
Number of segments, in one specimen 38, in another 44. 
Length, 4 to S""". 
ODONTOSYLLIS aaparide. 
Odontosyllis? fulgurans Clpd. 
Claparede. Glanures Zootomiques, etc., p. 95, pi. viii, f. 1. 
QuATREPAGES. Hist, des Ann., ii, p. 648. 
Mar. et Bobr : in Ann. des Sci. Nat., 6tli series, vol. ii, p. 40, pi. iv, f. 11. 
I am in doubt as to this form ; in many respects it agrees 
perfectly with 0. fulgurans, but in color, and in the structure 
of the feet and ventral cirri, it agrees better with 0. Du- 
gesiana {Glanures ZooL, p. 97, pi. 8, f. 2.) 
On the whole, my specimens seem to confirm the sup- 
position of Mar. and Bobr. (1. c. p. 41) that 0. fulgurans and 
0. Dugesiana are not distinct species. 
Sexual forms : male not found ; female, two specimens. 
In one, the capillary setae begin on the 21st setigerous seg- 
ment, and exist on 14 segments, followed by 28 segments 
with compound setae only ; some few of the posterior seg- 
ments lacking. In the other specimen the sexual setae are 
on 19 segments, beginning with the 21st ; rest of body 
lost. In both, the body back of the 20th segment was pure 
white, swollen with eggs, as far as the sexual setae extended. 
On one specimen, the dark crescents described under S. 
fragilis were seen, in the other, not. In the second 
female mentioned above, the eggs were very large, evi- 
dently nearly mature, and the eyes on each side had 
coalesced. 
Found on shells, stones, etc., dredged from 6 to 12 
fathoms. 
Length of a sexual form, from 4 to 12""". 
Length of a nearly entire female, containing 64 seg- 
ments, 12'""'. 
