ASCIDIADiE. 



35 



Perophora (Wiegm.). Animals roundishj com- 

 pressed ; thorax not marked with lines. 



P. Listen. Fig. 53 ; n. s, and mag. 



51 



52 



53 



Family III- Ascidiad^e. 



Ascidia (Bast.). Body sessile ; test more or less 

 leathery ; branchial sac not folded, sm^mounted by 

 a circle of simple tentacles ; branchial orifice eight- 

 lobed ; anal six-lobed ; both circular. 



A. intestinalis. 

 canina. 

 venosa, 

 mentula. 

 arachno'idea. 

 scabra. 

 virginea. Fig. 54 ; n. 



A. parallelogramma. 

 prunum. 

 aspersa. 

 vitrea. 

 conchilega. 

 orbicularis, 

 echinata. 



Molgula (Forbes). Body globose, attached or 

 free ; test membranous, usually invested with 

 foreign matters ; branchial orifice six-lobed ; anal 

 four-lobed ; both on very contractile, naked tubes. 



M. oculata. 



tubulosa. Fig. 55 ; n. s. 



d2 



