PLATE VIIL 



Figs. 1-10. Salpa democratica-mucronata. 

 Figs. 11-15. Salpa nitida, n. sp. 



p.p. Peripharyngeal bands. 



8.0. Sense organ. 



sp. Spines on test. 

 t. Test. 



f.c. Test cells. 

 f.m. Test matrix. 



t.p. Process of the test, 

 rj'.sc. Visceral mass. 



Fis. 1. 



Fig. 2. 



Fig. 7. 



Part of Salpa democratica-mucronata, solitary form ; from South Atlantic, 

 March 3-5, 1876, showing the very long tuberculated process (S. 1). 



Posterior end of young specimen of Salpa democratica-mucro7iata, solitary 

 form ; South Atlantic, February 12, 1876, showing the short processes (S. 1). 



One of the sucker-like processes of the mantle of last, seen in optical section 

 (S. 1). 



Posterior end of Salpa dem^ocratica-mucronata, aggregated form ; seen from 

 dorsal surface; Bass Strait, April 2, 1874 (S. 1). 



Part of test of Salpa democratica-Tnucronata, solitary form ; showing the 

 minute spines (S. \). 



Process from the body of a young specimen of Salpa dem,ocratica-m,ucronata, 

 solitary form; South Atlantic, February 12, 1876, showing the ectodei'm, 

 and the migration of cells into the test (S. \). 



Some of the ectoderm cells ; more highly magnified (Z. t^). 



Cells, in a young embryo of Salpa democratica-mucronata, which will later 

 become muscle fil)res'(S. ^). 



Muscle band in a somewhat older embryo (S. \). 



Same ; more highly magnified (S. ^). 



Part of a muscle band from Salpa nitida (S. \). 



Small part of a muscle fibre of same ; more highly magnified (Z. Vs). 



Dissection of Salpa nitida, from the Pacific, March 16, 1875, showing the 



arrangement of the muscles and other organs (S. 1). 

 Anterior dorsal part of last, enlarged (S. l). 

 Dorsal tubercle, nerve ganglion, &c., of last; more highly magnified (S. ^). 



