. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. MORPHOLOGY OF OTOCYSTS OF GONIONEMUS. 2Q5 With reference to the tentacles these organs display no abso- lutely fixed relationship. Though they usually alternate with the tentacles they may occur in pairs between two adjacent tentacles or two or more tentacles in continuous sequence may have no intervening otocyst. In G. vertens, nos. 6 and 7 had three paired otocysts between adjacent tentacles; no. 7 also had two abnormal otocysts with two. TEXT FIGURE 3. Abnormal otocyst with two sensory spheroids within the same primary ve
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. MORPHOLOGY OF OTOCYSTS OF GONIONEMUS. 2Q5 With reference to the tentacles these organs display no abso- lutely fixed relationship. Though they usually alternate with the tentacles they may occur in pairs between two adjacent tentacles or two or more tentacles in continuous sequence may have no intervening otocyst. In G. vertens, nos. 6 and 7 had three paired otocysts between adjacent tentacles; no. 7 also had two abnormal otocysts with two. TEXT FIGURE 3. Abnormal otocyst with two sensory spheroids within the same primary vesicle. sensory spheroids in each capsule Text Figure 3. Hargitt (1901: 249) has noted this last mentioned variation and has called attention to its relative infrequence. Specimen no. I of G. mur~ bachii had thirteen paired otocysts and no. 2 of the same species had eight. SUMMARY. 1. There are two distinct vesicles in the otocyst of Gonloncnius. 2. It seems probable that the conspicuous primary vesicle has chiefly a protective function, enclosing the essential sensory mechanism. 3. The secondary vesicle contains the otolith within a fluid- filled cavity. 4. No sensory hairs or ridges have been demonstrated. 5. Puncture of the primary vesicle as practiced by Murbach and others probably does not impair the essential sensory mechanism. 6. The otocysts of G. zfcrtcns and of G. uiurbachii are in close proximity to the periphery of the ring canal, their capsules im- bedded in the mesoglea so that no portion of them protrudes beyond the margin of the bell. 7. The number and arrangement of otocysts and tentacles in Gonlonenius is Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952;
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
