No: 424.]: THE GENUS TRYPANOSELLLS, 313 
and.that duty- must be accomplished solely by the expenditure 
of.the stored-up energy which it has derived from the stock. 
From the biological point of view the function of the zooids 
is the same, whether they arise by linear or by collateral 
budding. . In both cases . i 
there is an alternation of P- ou Viste. 
generations exactly com- e RE Cis 
parable to that of the Nee 
Hydromedusz. As regards AEN 

SPee 
S. ramosa the asexual SP eon mas 
stock is practically.as ses- ioe | Mee 
sile as the sponge in which Lj || mm. 5. 
ibo: : cb qv e 
it lives, and like. sessile cp 2 1 
organisms of much lower. m | a c 
grade it branches with e E = 
great freedom and facility. -e e 
It. is. not in the least sur- xo i er "y 
ws co i €... 
prising, therefore, to.find =p | 6 sol. 
such.a form. producing by LD it SS ; 
lateral budding free-swim- ce th ew 
ming zooids, which. serve i d 
as special disseminators of e iE => 
the.species and provide for BOIS 
& sexual reproduction in. fre 
e * 
which epossotertilisapion 1 is m Q 
assured. . 5t & H 
- In the forms under con- 8 J 
sideration the.case is SOm- pya; 17, — Ideal reconstruction of á mature male zooid 
what different. Notwithe, | Eig, lieu din n aero vi 
standing their large 5 size -`y The. sperm masses-are in every segment except the 
sand: heavy. form, o differ- . . somites 2 arid $.' The aciculz are omitted except in 
ent from the majority of - fie epe eh i arr agi a MM 
syllidians, suggest that 
they are somewhat sluggish in their habits, neither of them can 
be considered as sessile. Iti is difficult. to see, however, that they 
are any more inert than a multítude of annelids which have n 
‘nothing’ aberrant in their mode of reproduction. ` Pumy 
some more precise. meen, must be ‘sought. . , 
