102 THE TUNICATA OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 



ADDENDUM. 



As this paper was going to press I received from Dr BKUUE a couple of tubes con- 

 taining the following : 



Polyzoa pictonis, subspecies patagonica, Michn. One poor specimen from shore, 

 Port Stanley, Falklands, January 1903. Station 118. 



Lissamaroucium magnum, Sluiter. One colony about 3'5 cm. in diameter, trawled 

 from Station 346, 56 fathoms, December 1, 1903, Burdwood Bank. 



Amaroucium sp. (?). One colony about 3 cm. in diameter from same haul as the 

 last species. Station 346. 



EXPLANATION OF THE PLATE. 



Fig. 1. Styela lactea, Herdman. Large barrel-shaped specimen. Nat. size. 



Fig. 2. Part of large colony of Holozoa cylindrica, Lesson, with three small specimens of Styela lactea 

 attached. Nat. size. 



Fig. 3. Globular specimen of Styela lactea, showing the positions of the branchial and atrial apertures. 

 Nat. size. 



Fig. 4. Anterior end of similar specimen, showing the branchial aperture. Nat. size. 



Fig. 5. One of the echinated spines of Styela lactea. Enlarged. 



Fig. 6. Small, globular and very spiny specimen of Styela lactea. Nat. size. 



Fig. 7. Alimentary canal of Styela lactea. Slightly enlarged. 



Fig. 8. Dorsal tubercle and tentacles of Styela lactea. x 40. 



Fig. 9. Dorsal tubercle of Paramolijula grer/aria, Lesson. Enlarged. 



Fig. 10. Paramolgula horrida, Herdman, right side. Nat. size. 



Fig. 11. Part of branchial sac of P. horrida. x 40. 



Fig. 12. Diagrammatic plan of both sides of branchial sac of Styela paessleri, Michaelsen, supposed to 

 be cut through the endostyle and spread out : I. to IV., branchial folds. The number of bars on the folds and 

 in the interspaces is shown. 



Fig. 1 3. Small part of branchial sac of Styela paessleri. x 40. 



Fig. 14. Dorsal tubercle of Styela paessleri. x 40. 



Fig. 15. Fungulus antarcticus, n.sp., from the left side. Nat. size. 



Fig. 16. Branchial aperture of the same. Enlarged. 



Fig. 17. Part of branchial sac of same species, from the inside. x 40. 



Fig. 18. Dissection of Fungulus antarcticus, to show alimentary canal and gonads. A little enlarged. 



(ROY. soc. EDIN. TRANS., VOL. XLVIII., 320.) 



