. LAT. Fig. 4. Thliptodon diaphanus. (a) The radula, showing the median plate and the intermediate and lateral plates of one side. INT., intermediate plate; LAT., lateral plate; MED., median plate, (b) Enlarged detail of the mesial edge of the intermediate plate, (c) A bundle of hooks from the hook-sac of one side. Pneumodermopsis paucidens Boas 1886 Pneumodermopsis paucidens Boas, Spolia Atlantica. Dansk. Vid. Selsk. Skrift. iv, 160, pi. vii, figs. 105-6. 1887 Dexiobranchaeapaucidens Pelseneer, 'Challenger' Reports, xix. Pteropoda, 1, 17. 1926 Pneumodermopsis paucidens Pruvot-Fol, Moll. Ptero
. LAT. Fig. 4. Thliptodon diaphanus. (a) The radula, showing the median plate and the intermediate and lateral plates of one side. INT., intermediate plate; LAT., lateral plate; MED., median plate, (b) Enlarged detail of the mesial edge of the intermediate plate, (c) A bundle of hooks from the hook-sac of one side. Pneumodermopsis paucidens Boas 1886 Pneumodermopsis paucidens Boas, Spolia Atlantica. Dansk. Vid. Selsk. Skrift. iv, 160, pi. vii, figs. 105-6. 1887 Dexiobranchaeapaucidens Pelseneer, 'Challenger' Reports, xix. Pteropoda, 1, 17. 1926 Pneumodermopsis paucidens Pruvot-Fol, Moll. Pterop. gymnos. Res. Camp. Sri. Monaco, lxx, 12, pi. i, figs. 36-7. This species was very local in its occurrence in first survey material. It was taken in considerable numbers at 50-100 m. and at 100-250 m. at WS 996, and makes a second appearance at WS 997, where it was rather sparsely represented. It turned up nowhere else. Its greatest abundance at WS 996 may be related to the heavy concentration of Limacina bulimoides, since it is chiefly upon small thecosomes that these Gymnosomata are thought to feed. A close agreement is apparent between the depth distribution of P. paucidens at station WS 996 (Fig. 5) and that of Limacina at the same station. The night station, WS 997, did not yield sufficient numbers of individuals for an adequate comparison, but the day-time distribution of this gymnosome is in agreement with Meisenheimer's conclusion (1905, p. 98) that the Gymnosomata ('Tagtiere')—unlike most of the thecosomes—approach the surface by day.
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