COLLATERAL BUDDING IN ANNELIDS OF THE 
GENUS TRYPANOSYLLIS. 
HERBERT PARLIN JOHNSON. 
AsipE from the marvelous development of an extensively 
branching stock in Sy//is ramosa, the only mode of asexual 
proliferation hitherto known among annelids is the linear stolo- 
nization so well exemplified by species of Autolytus, Myrianida, 
Procerastea, Nais, and a few other genera of small chaetopods. 
Previous to the discovery of the extraordinary forms about to 
be described, the production of numerous co//ateral buds from 
a definite and circumscribed proliferating region has never, it 
is safe to say, been even imagined as among the possibilities of 
annelid development. 
As briefly announced more than a year ago,! two species of 
Syllidze living on our Pacific coast have been found to produce 
sexual zooids by collateral budding. These I have studied as 
fully as the scanty material permits, and the results, though 
far from complete, are, I trust, of sufficient interest to warrant 
their publication, particularly as the obtaining of more material 
is a matter of great uncertainty. 
Both species undoubtedly belong to the genus Trypanosyllis 
as defined by Malaquin,? and both are unusually large for 
syllidians. The larger, for which the name Z77ypanmosyllis 
ingens is proposed, is a veritable giant of its kind, measuring 
13 cm. in length, exclusive of the tail buds, and 6 mm. in width. 
The only specimen of this rare species I have seen was given 
to me by Prof. Harold Heath of Stanford University, to whom 
my grateful acknowledgments are due. It was found by him 
under a stone between tide marks, at Pacific Grove, California. 
1Johnson, H. P. A New Type of Budding in Annelids. Paper read at the 
eleventh annual meeting of the American Morphological Society at Baltimore, 
Dec. 27, 1900. An abstract was published in the Biological Bulletin, vol. ii, No. 6 
(1901). .? Malaquin, A. Recherches sur les Syllidiens, p. 72. Lille, 1893. 
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