382 E. R. Downing, 
can be placed upon it as a specific character.) 5—18 tentacles. 
Tentacles scarcely as long as the body. The latter cylindrical, 2 cm 
or slightly more in length when expanded. Foot usually enlarged. 
Nettle cells larger than véridis or fusca. Hermaphrodite. Sexually 
mature April—August and occasionally as late as December. Eggs 
fall off after forming the membrane. Membrane covered with large 
projections which are mostly divided at the tip. 
Ill. H. fusca L. Syonomy: Polype de la troisième espèce, 
TREMBLEY, though probably most of those described by TREMBLEY 
belong to the next species; brauner Polyp mit langen hörner- 
förmigen Armen, RösEL; H. oligactes Paunas; H. roeselii HaackeE; 
Fl. vulgaris Jickeut. Color brown, sometimes almost white. Ten- 
tacles 10—6 or possibly fewer, longer than the body when ex- 
panded. Nettle cells larger than in viridis. Body about 2 cm long. 
Hermaphroditic. Sexually mature Sept.—Oct. Eggs remain attached 
to parent until both germ layers are formed. Then the mother 
contracts bringing egg into contact with supporting object. To this 
the egg is attached by an eetodermal secretion of the mother. When 
attached, egg is flat below, convex above, membrane beset on upper 
side of egg with short points. 
IV. H. dioecia, nomen novum. Synonomy: H. spec? Braver, 
H. monoecia, DownInG !), Brown. Tentacles 5—8, and capable of 
much expansion, as much as ten times length of body. Body 2.5 cm 
long when expanded. Sexually mature Oct.—Dec. Sexes distinct. 
Eggs remain attached to parent until germ layers are formed. 
Mother then contracts, remaining until the eggs are well developed. 
Eggs are glued to the surface on which the mother rests. Egg 
spherical; membrane set with small knob. 
Braver distinguishes this species as ‘A. spec?’ presumably be- 
cause it is exceedingly difficult to determine what name should be 
applied to it. He says it has been both described and figured. 
Certainly some if not all of the figures which TREMBLEY gives of 
his third species and characterizes as the ‘Polypes a long bras’ are 
this species. But TREMBLEY of course does not apply a specific 
name. This was first done by Linnarus, and in his description ‘H. 
spec?’ was confused with A. fusca. This confusion has continued 
1) I suggested the name H. monoecia in my preliminary announcement 
(in: Science, V. 12, p. 228). This would be a use of the term monoecious 
directly contrary to its customary use in botany. I therefore use the 
specific name given above in place of that which I first proposed. 
