ASCIDIAD^E. 



35 



Peropkora (Wiegm.). Animals roundish, com- 

 pressed; thorax not marked with lines. 



P. Listeri. Fig. 53 ; n. s. and mag. 



51 



FAMILY III, ASCIDIAD.E. 



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

 leathery ; branchial sac not folded, surmounted by 

 a circle of simple tentacles ; branchial orifice eight- 

 lobed ; anal six-lobed ; both circular. 



A. intestinalis. 

 canina. 

 venosa. 

 mentula. 

 arachnoidea. 

 scabra. 

 virginea. Fig. 54 ; 



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 



