A NEW SPECIES OF POLYCHAETOUS ANNELID FROM PAN- 

 AMA, WITH NOTES ON AN HAWAIIAN FORM. 



By Aaron L. Treadwell, 



OJ Vassar College, Poughkeepsie, New York. 



Among tlie material received from time to time from the United 

 States National Museum for identification, there was a new species 

 of PTiyllodoce, collected at Chame Point, Panama, by Mr. Robert 

 Tweedliein 1912, which is herewith described. A reexamination of 

 material from the Hawaiian Islands, refened to Eunice siciliensis 

 Grube in a former paper, makes it necessary to change the name which 

 I then applied. This is done in the present paper, and additional 

 data, resulting from a more detailed study, are presented. 



LEODICE DUBIA Woodward. 



Eunice dubia Woodward, Bull. Mus. Comp. Zool., vol. 51, No. 1, 1907, p. 11, 



pi. 2, fig. 15; pi. 1, figs. 4, 5, 6. 

 Eunice siciliensis Treadwell, Bull. U. S. Fish Coram., 1903, p. 1165, 1906. 



In the above paper I described as Eunice siciliensis a small Leodicid 

 from the Hawaiian Islands. The identification was based mainly on 

 the structure of the jaws, the mandibles having the large calcareous 

 terminal portions characteristic of this species. Doubts as to the 

 accuracy of the determination led to a reexamination of the specimen, 

 now in the United States National Museum, and a comparison of the 

 posterior end with Woodward's description of Eunice (Leodice) duhia, 

 the small palolo of the "motosuga" day, or day before the swarming 

 of the true Palolo, estabUshed its identity with this. Woodward saw 

 only the swarming posterior ends but these were described with suf- 

 ficient accuracy to identify them with the specimen from the Hawaiian 

 Islands. 



No gills were visible on this single specimen, and this would ap- 

 parently transfer it to the genus Nicidion. On all of the members of 

 this group of the Leodicidae, however, as for instance, in Leodice 

 carihoea of the West Indies, the gill development is very Hmited and 

 the jaw structure is so characteristic of the Leodice that I have 

 placed it in this genus. 



Proceedings U. S. National Museum, Vol. 52-No. 2186. 



427 



