. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. Polynemertesia gracillima (G. O. Sars). 1873 Plumularia gracillima, G. O. Sars, Bidrag til Kuudskaben 0111 Dyrelivet paa vore Havbanker, p. 86. 1893 Plumularia groenlandica, Levinsen, Meduser, Cteuophorer og Hydroider, p. 63, tab. VIII, figs. 10—12. Single pinnate colonies with monosiphonic or in the basal parts polysiphouic main stem. The mono- siphonic stem is divided by trans- verse nodes into iuternodia, which bear distally a short apophyse, di- rected obliquely forward, turning alternately to either side of the me- dian
. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. Polynemertesia gracillima (G. O. Sars). 1873 Plumularia gracillima, G. O. Sars, Bidrag til Kuudskaben 0111 Dyrelivet paa vore Havbanker, p. 86. 1893 Plumularia groenlandica, Levinsen, Meduser, Cteuophorer og Hydroider, p. 63, tab. VIII, figs. 10—12. Single pinnate colonies with monosiphonic or in the basal parts polysiphouic main stem. The mono- siphonic stem is divided by trans- verse nodes into iuternodia, which bear distally a short apophyse, di- rected obliquely forward, turning alternately to either side of the me- dian line. The stem has no hydro- theae, but bears mobile sarcothecse, two unpaired, somewhat asymme- trically arranged on the basal part of each iuternodium. The apophyse has a "mamelon" on its upper side near the stem; beside this on the rear side a mobile sarcotheca, and * c Fig. XXXIV. Polynemertesia gracillima from the Davis Strait als0 an Unpaired mobile Sarcotheca [type specimen of Plumularia groenlandica\ a. Internodium of the distallv ill the median line The stem with primary apophyse. b. Second internode of a prim- ary hydrocladium with secondary apophyse, showing a distinct apophyse bears a secondarily brail- "mamelon". c. Hypothecate internode. (X So). ched hydrocladium; the hydrocla- dium is divided by transverse nodes into irregular internodia, of which every alternate one bears two unpaired sarcothecte in the median line, every other a median hydrotheca, a supracalycine pair of sar- cotheca^ at the opening of the same, and an unpaired proximal, and as a rule an unpaired distal sarco- theca in the median Hue; on the distal parts of the hydrocladia the hydrothecaless internodiuin often melts into the hydrotheca-bearing internodium. The basal internodium of the hydrocladium is hydro- theca-bearing; the following small internodium is furnished at the middle with an apophyse directed obliquely forward and bearing the secondary hydrocladium; from the
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