46 



PHYLUM TUNIC ATA (UROCHORDA). 



ft 



Br 



FIG. 38. a sexual, b asexual form of Salpa (Thalia) democratica-mucronata (from Clans). 

 mouth ; A atrial aperture ; N ganglion ; Br gill ; End endostyle ; Wg ciliated pit ; Ma 

 mantle ; Nu nucleus ; C heart ; Emb embryo ; st.p stolon. 



Wtf 



39. a Hind end of Salpa democratica, ventral view. St.p stolon ; Nu nucleus, b Ter- 

 minal part of stolon (young chain) magnified. mouth ; A atrial aperture ; N ganglionj; 

 Wg ciliated pit ; Wb peripharyngeal band ; End endostyle ; Af anus ; Br gill ; Nu nucleus ; 

 Ov ovary ; C heart (from Claus). 



