TUNICATA. 25 



PLATE III. 



Fins. 1, 2 and 3. Three specimens of Corolla eumjota, Traustedt, from the upper surface ; natural 



size. 



FIG. 4. Dorsal tubercle and anterior end of dorsal lamina ; slightly enlarged. 

 FIG. 5. Tentacles ; X 40. 

 FIG. G. Dorsal region of anterior end of branchial sac, showing tentacles, dorsal tubercle. 



epipharyngeal groove, dorsal languets and branchial sac ; x 50. 

 Fir;. 7. Moli/ula hodynoni, from right side ; natural size. 

 FIG. 8. Body after removal of test, right side ; natural size. 

 FIG. 9. left side ; natural size. 

 FIG. 10. Dorsal tubercle ; x 50. 

 FIG. 11. Part of branchial sac, from inside ; X 50. 

 FIG. 12. Alimentary canal and gonad of left side ; slightly enlarged. 

 FIG. 13. Alimentary canal and gonads of both sides, from the ventral surface ; slightly enlarged. 



PLATE IV. 



FIG. 1. Mol/julu bacca, right side ; natural size. 



FIG. 2. leftside; natural size. 



FIG. 3. Part of branchial sac from inside ; x 40. 



FIG. 4. Alimentary canal ; x about 2. 



FIG. 5. Tentacles and dorsal tubercle, etc. ; x 40. 



FIG. G. Halocynthia discoveryi, right side ; natural size. 



FIG. 7. The same, left side, from a photograph ; x 2. 



FIG. 8. Part of dorsal lamina, showing languets ; X 40. 



FIG. 9. Another group of languets closer together ; x 40. 



FIG. 10. Part of branchial sac, from inside ; X 40. 



FIG. 11. One of the compound tentacles. 



FIG. 12. The dorsal tubercle ; x 40. 



PLATE V. 



FIG. 1. Molgula concomitans, leftside, with Molguta lonyicmtlis, right side, adhering ; natural size. 

 FIG. 2. Part of surface of test of M. concomitans, showing the irregular hair-like prolongations, 



with a few sand grains ; x 40. 



FIG. 3. Base of stalk of M. hngkaulis, attached to right side of M. concomitans ; natural size. 



Fir;. 4. M. concomitans, removed from test ; natural size. 



FIG. 5. ,, part of branchial sac, from inside ; X 40. 



FIG. 6. dorsal tubercle ; X 40. 



FIG. 7. - ., ., one of the large much-branched tentacles ; X 40. 



FIG. 8. M. lonyicau/is, removed from test ; natural size. 



FIG. !). part of mantle. 



Fio. 10. part of branchial sac, from inside. 



FIG. 11. ., dorsal tubercle ; X 40. 



