CTENOSTOMA.TA. 



Fig. 27. 



489 



l\^^ 



Mimosella gracilis. 



Suborder III.— CTENOSTOMATA*, Busk. 



Ctenostomata, Busk : Alder : Gosse : Smitt : Heller : Cams : Joliet : &c. 

 Halcyonellea and Vesicularina, Johnston. 



* The diagnosis of the suborders will be found in the portion of the In- 

 troduotion devoted to Classifieation. 



