PLATE V. 



Figs. 1-3. Molgida pedunculata, Herdman. 

 Figs. 4-7. Molgula horrida, Herdman. 

 Figs. 8-11. Molgula forbesi, Herdman. 



Fig. 1. Molgula 'pedunculata, from the left side and anterior end ; natural size. 



Fig. 2. The same with the test removed, showing the siphons, the musculature of the 



mantle, and the position of the nerve ganglion ; natural size. 

 Fig. 3. Part of the branchial sac of Molgula pedunculata, seen from the inside ; magni- 

 fied (Hartn., obj. 4). 

 Fig. 4. Molgula horrida, from the right side ; natural size. 

 Fig. 5. The same with the test removed, to show the funnel-like siphons, the musculature 



of the mantle, and the position of the renal organ on the right side ; natural 



size. 

 Fig. G. The dorsal tubercle, and part of the tentacular circlet of Molgula horrida, seen 



from the inside ; enlarged. 

 Fig. 7. Part of the branchial sac of Molgula horrida, seen from the inside ; magnified 



(Hartn., obj. 4) 

 Fig. 8. Molgula forbesi, from the right side ; natural size. 

 Fig. 9. The same with the test removed, seen from the left side, showing the position 



of the alimentary canal and the genital gland ; natural size. 

 Fig. 10. Part of the branchial sac of Molgula forbesi, seen from the inside; magnified 



(Hartn., obj. 4). 

 Fig 11. The dorsal tubercle and the peritubercular area of Molgida forbesi ; magnified 



(Hartn., obj. 4). 



