. The Danish Ingolf-expedition. gests to represent a growth change, is due to the preservation. —Observations on living specimens are necessary to decide these questions. A peculiar variation was found in a few specimens,viz. the infundibular canal being split up in a greater partof its length (Fig. 14); in one case it was even divided inthe whole length. Regarding the colour of the tentacles it should bementioned that there are two laterally placed, close seriesof pigment spots; these series continue upwards, alongthe sides of the upper part of the tentacle basis, recedingsomewhat on passing
. The Danish Ingolf-expedition. gests to represent a growth change, is due to the preservation. —Observations on living specimens are necessary to decide these questions. A peculiar variation was found in a few specimens,viz. the infundibular canal being split up in a greater partof its length (Fig. 14); in one case it was even divided inthe whole length. Regarding the colour of the tentacles it should bementioned that there are two laterally placed, close seriesof pigment spots; these series continue upwards, alongthe sides of the upper part of the tentacle basis, recedingsomewhat on passing over from the tentacle to the arrangement I have found in all the specimens exam-ined, so that it very probably is a constant feature of thisspecies. In PI. 3, fig. 5 of L. Agassiz memoir, quoted above,these series of pigment spots are indicated, their receding atthe basis of the tentacle being well shown, while otherwisethe arrangement in two distinct series along the tentacle is ? - tsh phj ph not ,--th. Chun (Monogr. p. 242) states, as an instance showing ^.^^^ piu,^, seen from the tenta- wie die relativen Grossenverhaltnisse derselben Art an den cular plane; showing forking of infundibular canal. Letters as in Fig 13. besides: ot. otolith;verschiedenen Ktistenpunkten, je nach der Haufigkeit von ^ ^ ^.jj opening of the tentacle sheath. heftigen Winden, ausgiebigen Schwankungen unterworfen sind that im AUgemeinen die amerikanische Pleurobrachia rhododactyla doppelt so gross (ist), als die offenbar mit ihr identische Cydippe (Pleurobrachia) pileus der stiirmischen Nordsee. This is doubtless not correct. The Plnirohr. pilnis abounds in the North Sea in sizes by no means smaller than 72 CTENOPHORA. those represented, evidently in natural size, on the PI. I of L. Agassiz memoir. According to Van-hoffen they ma> reach a size of 25 in diameter, and Evans and Ashworth) even record alenght of 30; so large I have not them myself.
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Keywords: ., bookcentury1800, bookdecade1890, booksu, booksubjectmarineanimals
