Archive image from page 93 of The Danish Ingolf-Expedition (1919). The Danish Ingolf-Expedition danishingolfexpe0508ingo Year: 1919 86 MEDUSA. I. values found. According to the table a difference between the East- and West-Atlantic specimens seems actuallv to exist with regard to the quantity — in so far as the average value as well as the extremes of the series of variation are distinctly lower as far as the specimens from the two western areas are concerned than in the case of the specimens from the three eastern areas. That means that the marginal vesicles are placed somewhat nearer to the
Archive image from page 93 of The Danish Ingolf-Expedition (1919). The Danish Ingolf-Expedition danishingolfexpe0508ingo Year: 1919 86 MEDUSA. I. values found. According to the table a difference between the East- and West-Atlantic specimens seems actuallv to exist with regard to the quantity — in so far as the average value as well as the extremes of the series of variation are distinctly lower as far as the specimens from the two western areas are concerned than in the case of the specimens from the three eastern areas. That means that the marginal vesicles are placed somewhat nearer to the radial canals in the specimens from the western Atlantic than in the specimens from the eastern Atlantic area. The standard deviations are, however, so large that we cannot state at present, whether this result rests on a real fact or whether it is merely casual. Distribution and Occurrence. Tiaropsis nmlticirrata has a fairly wide distribution in the North-Atlantic area. Its occurrence is distinctly neritic. It is very common at the Atlantic coast of North-America from Eastport to Cape Cod (L. Agassiz 1849, A. Agassiz 1865, Bigelow 1912, 1914 a, 1915). Within that region it occurs during the spring from March to May or the beginning of June. It is met with only occasionally south of Cape Cod, penetrating as far as Woods Hole (Nutting 1901, Hargitt 1902 and 1904). At the west coast of Greenland Tiaropsis vmlticirrata has been found on several locali- ties near the shore (see chart X), as far north- wards as Egedesminde (loc. 3). With regard to the occurrence on loc. 4, 5, and 6 (the stations of the 'Tjalfe' expedition) I shall make the following remarks: On stat. 221 (loc. 4), August 28th 1908, a specimen was taken about 50 m below the surface; in an adjacent place the temperature of the water was found to be evenly decreasing from 4°.78 at the surface to o°.63 near the bottom (128 m); about 50 m below the surface the temperature was about 2°, the salinity about 33 o- In
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