Studies from the Biological Laboratory: V.1 -5; 1877/78-1891/93, Band 1,Teil 3

abdominal aboral affinity animals Annelids antennary segment anus appearance appendages bends body body-cavity body-wall Brachiopods Bryozoa carapace Chaetopods chamber Chesapeake Bay ciliated corpuscles Crustacea Decapod digestive cavity digestive organs digestive tract dorsal dorsal surface dorsal valve dorsal view dredged earlier stage Echinoderms ectoderm edge embryo embryology endoderm spherules Figure 14 food yolk foot Fort Wool ganglia ganglion gastrula gastrula mouth head vesicle integument intestine laboratory larva later stage layer of ectoderm Lingula lophophore magnified mantle maxillae maxilliped median line ment Mollusca Morse Müller nearly nervous system observations œsophagus opaque oral end pair paper peduncle Plate 11 Polyzoa Polyzöon portion posterior end posterior margin resemblance rocks rostrum seen setae shell shown in Figure side species specimens spines Squilla stage of development stage shown stomach swimming telson tentacles transparent Veliger velum ventral ventral surface ventral valve ventral view Vermes W. K. BROOKS zoölogy