THE OPALINID CILIATE INFUSOEIANS. 



71 



nucleus in a dumb-bell condition, less or more constricted according 

 to their mitotic state. 



a 



Fig. 42. — Peotoopalina ehinodkrmatos : a and I, magnified 460 diameters; c, tub 



PREVALENT SORT OF INDIVIDUALj X 1,000 DIAMETERS. 



PROTOOPALINA RHIN0DERMAT0S,2» new species. 



ry^e.— United States National Museum Cat. No. 16448. 

 Host. — Rhinoderma darwinii Giinther, one good infection from 

 United States National Museum specimen No. 38931, 44 mm. long, 



21 The Greek genitive is used instead of the Latin feminine genitive, which would be 

 awkward for this Greek neuter noun. Of course, either is allowable. 



