On a Case of Collateral Budding in 



Syllid Annelid 



(Trypanosyllis misakiensis N. Sp.) 



BY 



Akira Izuka. 



Science Collage, Imperial University, Tòkyo. 



During a short stay in the Misaki Marine Biological Laboratory in the 

 spring of 1903, I obtained, among other Annelids, a unique specimen of 

 a Polychaete provided with numerous collateral buds at the posterior end 

 of body. The worm I consider to represent an undescribed species of 

 the genus Trypanosyllis,* of which only a few species have hitherto been 

 recorded but none as yet from this part of the world, while collateral buds 

 have been observed in two cases only (7". ingens and T. gcnnnipara from 

 the Pacific coast of America.) 



The specimen in question was found crawling upon a block of stone 

 brought up from a depth of about seven fathoms, off the western coast of 

 Jögashima, an island about two miles south of the laboratory. 



Structural Characters of the Species. 



Color. — In the living state, the body as well as the caudal sexual buds 

 are of a reddish yellow color, while the tentacula and the cirri are light yel- 



* Trypanosyllis caeliaca Clap. (Naples, Madeira, Marseille). 

 T. Krohnii Clap. (Madeira, Marseille, Dinard). 

 T. aeolis Langerhans. (Medeira). 

 7*. iiigens Johnson. (Pacific Groove, California). 



T.gemmipara Johnson. (Probably in the vicinity of Port Townrend). 

 T.gigantea (M'Intosh) Ehlers, (off Kerguelen). 



