BOTRYLLID^E. 



33 



Amcercecium (M.-Edw.). Mass lobed or encrust- 

 ing, sessile or stalked ; systems numerous, having 

 a central cavity. Animals as in Aplidium ; anal 

 orifices opening into a common discharging vent. 



A. proliferum. Fig. 46 ; n. s. and mag. 

 Nordmanni. 

 Argus, 

 albicans. 



Leptoclinum (M.-Edw.). Mass thin, sessile, en- 

 crusting, varying in form ; systems numerous. 

 Animals composed of thorax and abdomen ; 

 branchial orifice six-rayed ; anal orifice opening 

 into a common vent, more or less ramified. 



L. maculosum. 

 asperum. 



L. gelatinosum. 

 Listerianum. 

 punctatum. 



Fig. 47 ; n. s. 



Distoma (Gaertn.). Mass sessile, cartilaginous, 

 varying in form ; systems numerous, circular. 

 Animals placed irregularly in one or two ranks, 

 composed of thorax and a stalked abdomen; 

 branchial and anal orifices six-rayed. 



D. rubrum. Fig. 48 ; 

 variolosum. 

 D 



