THE " PORCUPINE " AND " LIGHTNING" TUNICATA. 231 



Fig. 3. Small part of the branchial sac of Ascidia plebeia, var., seen from the inside ; magnified 

 50 diameters. 



Fig. 4. a. — f. Six specimens of Polycarpa pusilla, n. sp. ; natural size. 



Fig. 5. Small part of the branchial sac of Polycarpa pusilla, seen from the inside ; magnified 50 

 diameters. 



Fig. 6. Eight half of the anterior part of the branchial sac, showing also the tentacles, the 

 endostyle, the dorsal tubercle, the prebranchial zone, &c; magnified 50 dia- 

 meters. 



PLATE XXXVI. 



Figs. 1-6. Polycarpa formosa, n. sp. 

 Figs. 7-11. Polycarpa curta, n. sp. 

 Figs. 12-14. Eugyra glutinans, Moller. 



Fig. 1. Polycarpa formosa, from the right side ; natural size. 



Fig. 2. Another specimen of the same species. 



Fig. 3. Group of one small and two large specimens of the same species ; natural size. 



Fig. 4. Specimen of Polycarpa formosa, dissected from the left side to show the alimentary- 

 canal, &c; slightly enlarged. 



Fig. 5. Small part of the branchial sac of Polycarpa formosa, seen from the inside ; magnified 

 50 diameters. 



Fig. 6. Dorsal tubercle, &c, of Polycarpa formosa ; magnified 50 diameters. 



Fig. 7. Specimen of Polycarpa curia; natural size. The arrows indicate the branchial 

 (inhalent) and atrial (exhalent) apertures. 



Fig. 8. Two other specimens of the same species. 



Fig. 9. Small part of the branchial sac of Polycarpa, curta, seen from the inside ; magnified 50 

 diameters. 



Fig. 10. Small part of the dorsal lamina and branchial sac of Polycarpa curta, from inside ; 

 magnified 50 diameters. 



Fig. 11. Dorsal tubercle and peritubercular area of Polycarpa curta ; magnified 50 diameters. 



Fig. 12. Centre of a spiral from branchial sac of Eugyra glutinans ; magnified 50 diameters. 



Fig. 13. Centre of another spiral from the branchial sac of Eugyra, glutinans ; magnified 50 

 diameters. 



Fig. 14. Another similar spiral from Eugyra glutinans ; magnified 300 diameters. 



VOL. XXXII. PART II. 2 P 



