Archive image from page 30 of The Danish Ingolf-Expedition (1918). The Danish Ingolf-Expedition danishingolfexpe0507ingo Year: 1918 HYDROIDA II 23 The single gonothecse are reversed, narrowly conical to almost cylindrical, fastened to the hydrocanlns by a rudimentary stalk at the narrow end; distally, they are furnished with three, more rarely with four or two, round lateral openings, each with a short neck. Material: depth 600 fathoms 4,5° - 582 - 3,3° - 485 6,i° - 872 metres Levin sen (1913 p. 287) believes to have found a blind sack in Lictorella pinnata; this must doubtless be due to an
Archive image from page 30 of The Danish Ingolf-Expedition (1918). The Danish Ingolf-Expedition danishingolfexpe0507ingo Year: 1918 HYDROIDA II 23 The single gonothecse are reversed, narrowly conical to almost cylindrical, fastened to the hydrocanlns by a rudimentary stalk at the narrow end; distally, they are furnished with three, more rarely with four or two, round lateral openings, each with a short neck. Material: depth 600 fathoms 4,5° - 582 - 3,3° - 485 6,i° - 872 metres Levin sen (1913 p. 287) believes to have found a blind sack in Lictorella pinnata; this must doubtless be due to an accidental S-shaped curvature of the polyp, which woidd not, however, produce 'Ingolf' St. 7 63° 13' N., i5°4i' W., - 25 63°3o' N, 54025' W, - Si 61 '44' N, 27°oo' W, 'Thor' 6i°i5' N., 9°33' \\\, _ _ 600 m Fig. VII. Finds of Lictorella pinnata in the Northern Atlantic. a blind sack of any real anatomical importance. Microtome sections reveal an entirely uniform gastral endoderm, and I have not been able to find any portion of the endoderm histologically corresponding to the epithelium in the blind sack of Sertulariidce. The 'blind sack' observed must thus be due to accident. Lictorella pinnata exhibits a highly remarkable distribution (fig. VII). It belongs to the upper part of the abyssal region, but penetrates as far down as 1300 metres; on the other hand, the species can at times occur right up in the littoral region, and has been met with in the Hardanger Fjord even up at a depth of only 90 metres. Horizontally, the species seems to be quite widely distri- buted, but the few records from southern seas are unreliable, as the species has here been confused with Lictorella antipathes (Lamarck). Pictet and Bedot (1900 p. 16) record it from the Bay of Gas-
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