PLATE VII. 



Figs. 1-9. Salpa cordiformis-zonaria. 

 Fig. 10. Salpa cylindrica. 



ap. Lateral appendage of ganglion. 

 d.l. Dorsal lamina. 

 d.t. Dorsal tubercle, 

 m. Mantle. 

 1, 2. Muscle bands. 



n. Nerves. 

 )i.<j. Nerve ganglion 

 oc. Sense organ. 

 p.p. Peripharyngeal band. 



Fig. 1. Salpa cordiformis-zonaria, aggregated form, from the North Atlantic 

 (" Elnight-Errant" Expedition ; natural size). 



Fig. 2. Another specimen of same ; natural size. 



Fig. 3. A third specimen of same ; natural size. 



Fig. 4. Specimen of the solitary form of same species, from Station 166 ; natural size. 



Fig. 5. Part of a specimen of Salpa cordiformis-zonaria, aggregated form, showing 

 three embryos (S. 1). 



Fig. 6. Part of specimen of Salpa cordiformis-zonaria, aggregated form, from the 

 South Atlantic, March 9, 1876, showing dorsal tubercle, nervous system, 

 and neighbouring parts (S. ^). 



Fig. 7. Part of the side of the dorsal tubercle of same specimen ; highly magnified 



(S. i). 



Fig. 8. Edge of last; still more highly magnified (Z. ^). 



Fig. 9. Large cells, forming the lateral appendages of the nerve ganglion (see fig. 6) ; 

 highly magnified (S. ^). 



Fig. 10. Dissection of part of Salpa cylindrica, aggregated form, showing dorsal 

 tubercle, nerve ganglion, etc. (S. ^). 



