Plate LXXI. 
Fig. 332. ENTEKOMORPHA ERECTA. 
Colour. A pleasant, light grass -green. 
Substance. Membranaceous ; thin ; soft. 
Character of Frond. Thread-like (//amewtows) ; cylindrical; tubular; rising with a (generally) 
undivided main stem, closely set with opposite or alternate undivided branches ; the 
lowermost longest ; all tapering at the tips. Branches clothed throughout with short, 
slender, almost hair-like, spreading branchlets, which give the plant a feathery 
appearance. All the tips finely pointed. 
Measurement. From 4 to 8 inches long. 
Fructification. Minute seeds {zoospores) formed of the colouring matter in the cells of which 
the frond- membrane is composed ; and in due time bursting through them. 
Habitat. Our coasts generally. On rocks and in pools between tide-marks. Not uncommon. 
The above description applies to the strictly characteristic specimens of the species ; 
so-called typical forms, that is. But intermediate ones abound, which are neither exactly 
E. erecta nor yet E. clathrata, ramulosa, or Linkiana, but combinations from them ; and 
Dr. Harvey is of opinion that these four species are but one, under different circumstances 
of growth. For the present, however, the variations take rank as typical characters ; and all 
that a collector can do, is to place his intermediates in the set they come nearest to, on the 
whole. He cannot go far wrong so long as he keeps those with pointed tips clear of those 
■with blunt ones. In the Nereis Boreali- Americana, E. erecta and E. ramulosa are referred to 
E, clathrata. 
Fig. 333. ENTEKOMORPHA CLATHRATA. 
Colour. A delicate grass -green. 
Substance. Membranaceous ; thin ; soft. 
Character of Frond. Thread-like {filamentous) ; cylindrical ; tubular ; bushy ; rising with a 
(generally) undivided main stem, closely set with branches on every side ; all taper- 
ing to the tips ; occasionally interwoven and spreading in fleeces. Branches several 
times re-branched ; everywhere thickly clothed with short, hair-like, wide-spread, or 
back-curved branchlets. All the tips finely pointed. 
Measurement. From 2 to 12 inches long. 
Fructification. As before. 
Habitat. Our coasts generally. On rocks between tide-marks. Not uncommon. 
Distinguishable from E. ramulosa by its greater slenderness, softness, and more profuse 
branching. 
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