Elementary text-book of zoology (1884) Elementary text-book of zoology elementarytextbo0201clau Year: 1884 Class III.—PTEROPODA. * Hermaphrodite Mollusca without sharply separated head, with two large wing-like fins, often ivith cephalic cones. The body is sometimes elongated and straight, sometimes with its hinder part spirally rolled. The anterior region bears the * Bang et Souleyet, 'His- toire naturelle des Mollusques Pteropodes.' Paris, 1852. C. Gegenbaur, ' Unter- suchungen iiber die Ptero- poden und Heteropoden.' Leipzig, 1855. A. ' Krohn, Beitrage zur Entwickelungsgeschichte der 1'ter
Elementary text-book of zoology (1884) Elementary text-book of zoology elementarytextbo0201clau Year: 1884 Class III.—PTEROPODA. * Hermaphrodite Mollusca without sharply separated head, with two large wing-like fins, often ivith cephalic cones. The body is sometimes elongated and straight, sometimes with its hinder part spirally rolled. The anterior region bears the * Bang et Souleyet, 'His- toire naturelle des Mollusques Pteropodes.' Paris, 1852. C. Gegenbaur, ' Unter- suchungen iiber die Ptero- poden und Heteropoden.' Leipzig, 1855. A. ' Krohn, Beitrage zur Entwickelungsgeschichte der 1'teropoden und Heteropo- den.'i Leipzig, 1860. H. Fol, ' Sur le deVeloppement des Pteropodes.' Archives da experimentale, etc., Tom. IV., 1875. FIG. 523.—7, Pneiimodermon violaceum from the ventral side. I, Cllone australls frqm the side (Bronn). Fl, fins; Tt, tentacles.
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