THE OPALINID CILIATE INFUSORIAXS. 



143 



and their residence in hosts of different families make this very im- 

 probable. It seems best to give the Paraguayan form a provisional 

 subspecific name for convenience of reference, pending further study. 



Fig. 107. — Cepedea dimidiat.\ [paraguen.sis], X 400 diameters. 

 CEPEDEA DIMIDIATA HAWAIENSIS, new subspecies. 



Ttjpe. — United States National Museum Cat. No. 16512. 



Host. — Rana catesheiana Shaw, numerous infections from bull- 

 frogs purchased from a San Francisco, California, dealer, who said 

 the frogs were from Hawaii, having been originally introduced into 

 Hawaii some years before from North America. I have opened over 

 40 bullfi'ogs (this species), large and small, from the eastern and 



the southeastern United States and have never found an infection of 

 Ofdlina. I have opened also many bullfrog tadpoles, of different 

 ages, Avith a similar result. On the other hand a considerable pro- 

 portion of these Hawaiian bullfrogs purchased in San Francisco 

 showed good infections. 



Measurements: A, of a large, spirally hoisted individual; B, of 

 a sometohat smaller individual — 



Measurements . 



I mm. 1 mm. 



Length of body i 0.2 0.17 



Width of body . 06 . 043 



Length of nucleus . 006 . 0065 



Width of nucleus j . 0044 . 0057 



Cilia line interval, middle I i .0025 



Cilia short, like those of C. dimidiata. \ 1 



