PLATE XVIII. 



Fig. 257. Eolis farinacea, Gould (= papillosa) ; from a drawing by B. F. 



Nutting. 

 Fig. 258. Eolis papillosa, eggs ; from a drawing by Toppan. 

 Fig. 259. Eolis farinacea ; from a drawing by B. F. Nutting. 

 Fig. 260. Eolis farinacea, tip of lingual membrane ; from a drawing by Dr. 



Gould. 

 Fig. 261. Eolis papillosa; from a drawing by Toppan of an East Boston 



specimen. 



Fio-. 262. Eolis farinacea, one of the branchiae ; from a drawing by B. F. 



Nutting. 



Fig. 263. Eolis farinacea, outline showing the arrangement of the branchial 

 papilte ; from a drawing by B. F. Nutting. 



Fig. 264. Eolis salinonacea ; from a drawing by B. F. Nutting. 



Fig. 265. Same as last. 



