244 AMPHITRITE. 



oyster shell. This animal protruded a snow-white plume, sparingly 

 stained with some dark specks. It consisted of about twenty-eight 

 feathered branchiae, but was never unfolded, nor shewing more than 

 about half an inch. The Amphitrite was always extremely strong. I 

 preserved it, in hopes of farther disclosure ; but it disappeared in three 

 months, without any visible change, having probably wasted away. 

 Plate XXXII., fig. 13. 



PLATE XXXI. 



FIG. 1. Amphitrite bombyx. 



2. Another specimen. 



3. Branchiae, enlarged. 



4. Another reproduced, enlarged. 



5. Another one of fig. 4, Plate XXXII., reproduced, enlarged. 



6. Organs on the back of one of the branchiae, a, J, c, enlarged. 



7. Antennulse, enlarged. 



PLATE XXXII. 



FIG. 1. Amphitrite bombyx, sheath. 



2. Spawn, enlarged. 



3. Fragment about five lines long, separated from the extremity of a 



specimen, delineated 27th November 1830. 



4. The same, having generated a plume in 116 days, delineated 14th 



March 1831. 



5. Sundered fragment, extending about an inch, as appearing when 



delineated, 28th March 1831. 



6. The same, with a regenerated plume, 25th April 1831. 



7. Original trunk and plume from which fig. 5 was sundered. 



8. The first of three sections of a specimen, with its original plume 



appearing three weeks after mutilation of the rest. 



9. The second or middle sectiou of the same specimen, delineated at 



the same time as fig. 8. 



10. The third section, or extremity of the specimen, still without any 



symptom of reproduction, delineated at the same time as figs. 8, 9. 



11. The same, fig. 10, having generated a perfect plume of eight bran- 



chiae, fifty-five days after mutilation. 



12. The same, fig. 11, enlarged. 



13. Specimen with a snow-white plume. 



