310 



Part III — Seventh Annual Report 



Plate IV. 



Fig. 1. Larval fish with peculiar inflection at the rectum. 30th March, x 50. 

 Fig. 2. The same species shown in Plate III. fig. 8, placed on the side so as to show 



the broad marginal fin. 13th March. x about 12. 

 Fig. 3. Enlarged view of a dead example of the foregoing at a somewhat earlier stage. 



2nd March. x 52. 



Fig. 4. Head and anterior end of the same species viewed from the ventral surface, 

 x 52. 



Fig. 5. Dorsal view of a post-larval gadoid, to show the general arrangement of the 

 pigment. Enlarged under a lens. 



Fig 6. Lateral view of a similar gadoid as it appears in the mid-water-net of May 

 and June. The pinkish colour of the crustacean food in the stomach 

 shines through the body-wall. Enlarged under a lens. 



Plate V. 



Fig. 1. Gelatinous algoid, very abundant in the Bay in April, May, and June, and 



forming the food of many of the smaller animals. Magnified. 

 Fig. la. Optical section of the same. Similarly magnified. 



Fig. 2. Minute structure of the gelatinous masses as observed in June. x 23 6. 

 Fig. 3. Spherical variety of the foregoing. June. Magnified. 

 Fig. 4. Another variety of the same. Magnified. 



Fig. 5. Thaumantias melanops, with a parasitic young Peachia adhering to the margin 

 of the disc. The anemones are thus carried about within easy reach of the 

 pelagic fishes. Enlarged under a lens. 



Fig. 6. Thaumantias, differing from any known form, though coming nearest T. 

 melanops, about natural size. 24th July 1888. 



Fig. 7. The same, enlarged under a lens. For simplicity the tentacles have been 

 omitted posteriorly. 



Fig. 8. Portion of the margin of the disc more highly magnified, to show the arrange- 

 ment of the tentacles and ocelli. x 50. 

 Fig. 9. Reproductive band (in a male example), x about 10. 



Plate VI. 



Figs. 1, 2, and 3. Various conditions of the larval form of Phoronis (Adinotrocha). 



In fig. 1, the larval tentacles are in full development. In fig. 2, the buds 

 of the new tentacles are shown at the bases of the old. In fig. 3, the 

 folded tube, which afterwards becomes the body of the adult, is observed. 



Fig. 4. Aetmotrocka undergoing transformation. The tube is unrolling, like the turn- 

 ing of tbe finger of a glove inside out. The hood is also shrinking. 



Fig. 5. A further stage of the foregoing, a prolapse of the viscera having occurred at 

 the anus. 



Fig. 6. Anal ciliated ring of Actinotrocha. 



Fig. 7. Young Phoronis after the transformation. 



Fig. 8. The same, at a subsequent stage. The anus and mouth now lie near each 

 other. 



Fig. 9. A young Appendicularian. 28th June. The caudal appendage seems to be 

 shrivelled. Enlarged. , 



The foregoing drawings (Plate VI. ) were made by Mr Alford Anderson, formerly 

 Prizeman in Zoology, and now a student of medicine in Edinburgh. 



