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U.S. NATIONAL MUSEUM BULLETIN 227 



Figure 40. — Syllldae, Autolytus prolifer: a, dorsal view anterior and posterior ends, with 

 chain of female sexual buds; b, dorsal view anterior end of female stolon or sacconereis 

 stage, massed with eggs; c, dorsal view anterior end of male stolon or polybostrichus 

 stage. 



0-2 postnatatory setigers; body brownish red or green (for details 

 of chain formation of stolons, see Mensch, 1900a). 



Biology. — Found at low water among stones, algal clumps, hold- 

 fasts of Laminaria, on pilings among hydroids, bryozoans, ascidians. 

 The}^ form tough tubes. Dredged down to 15 fathoms, on gravelly 

 bottoms, with shells, among algae, bryozoan nodules, tunicates (as 

 sandy Amaroecium). They were present in the oceanographic foul- 

 ing studies in the New England region. Stem forms in the process 

 of forming sexual stolons are found at any time of year but are 



