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The sucker-bearing processes of Pneumonoderma are outgrowths of the proboscis. A, Veliger-larva of an Opisthobranch Polycera. In the nervous system of Aplysia the great ganglion-pairs are well developed and distinct. Spire of shell somewhat elongated; mantle-border fringed; viviparous; fluviatile.
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Even among some Gastropoda viz. This acts as a larval heart, but ceases to pulsate after a time. No ctenidium, pallial cavity transformed into a lung; aperture of shell circular; terrestrial. It is now understood that they are Euthyneurous Gastropods adapted to natatory locomotion and pelagic life.
A fragment of the second book was published later at La Haye , but the remaining five were never composed, Gassendi apparently thinking that after the Discussiones Peripateticae of Francesco Patrizzi little field was left for his labours.
He certainly added little to the stock of human knowledge, but the clearness of his exposition and the manner in which he, like Bacon, urged the importance of experimental research, were of inestimable service to the cause of science. Shell conical; foot secreting a ventral calcareous plate; animal fixed.
Blood is also found mixed with the discharges from the bowels, rendering them dark or tarry-looking. Choose the color of the image. The digestive tract of Patella offers some interesting features.