220 



Annelida Ghxjetopoda 



Number of segments, in one specimen 38, in another 44. 

 Length, 4 to S'"'". 



ODONTOSYLLIS aaparede. 



OdONTOSYLLIS ? FULGURANS Clpd. 



Claparede. Glanures Zootomiques, etc., p. 95, pi. viii, f. 1. 

 QuATREFAGES. 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 Zo'ot., 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 O./ulguranssmd 

 0. Dugesiana are not distinct species. 



Sexual forms : male not found ; female, two specimens. 

 In one, the capillary setse 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"^"^. 



