THE OPALINID CILIATE INFUSORIANS. 



73 



Measurements of two individuals: A, with two distinct nuclei; 5, 

 with single, dunib-hell shaped nucleus — ■ 



Measurements. 



Length of body 0.076 



Width of body .03 



Length of nucleus . 017 



Width of nucleus .006 



0.083 



.024 



daughter nc. .017 



daughter nc. . 007 



This little Protoopalina is very like the larger P. rhinoderinatos. 

 It has a distinct posterior process much as we see in P. caudata. 

 Its ellipsoid nuclei are in an anaphase condition, showing six 

 massive chromosomes. An occasional individual, recently come from 

 division, is found having a dumb-bell-shaped nucleus (fig. 42, c). 

 That this species is distinct from P. rhinoderinatos is indicated by 

 its smaller size; its definite posterior proceses; its body form, less 

 tapering posteriorly; and its always elliptical and never spindle- 

 shaped nuclei. 



PROTOOPAHNA MOSSAMBICENCIS, new species. 



Type. — United 'States National Museum Cat. No. 16450. 



Host. — Rana adspersa Tschudi, one scant infection from United 

 States National Museum specimen No. 7127, 80 mm. long, female 

 with eggs, from Mozam- 

 bique, Africa, no date, W. 

 Peters, collector. 



Measuremeiits of a full- 

 sized individual. — Length 

 of body 0.1065 mm. ; width 

 of body 0.0268 mm. ; length 

 of nucleus, first nucleus 

 0.013 mm., second nucleus 

 0.0185 mm., third nucleus 

 (usual) 0.013 mm.; width 

 of nucleus, first nucleus 

 0.003 mm., second nucleus 

 0.004 mm., third nucleus 

 0.007 mm. ; diameter of 

 endospherule 0.0015 mm. ; 

 cilia line interval, anterior 0.00138, middle 0.00165 mm., posterior not 

 clearly seen. 



This very small Protoopalina differs from the last two species 

 described in having the posterior end of the body rounded instead 

 83103—23 6 



Fig. 44. — Protoopalina mossambicensis, X 460 di- 

 ameters : d AND e ARE CYSTS ; in d THE animal 



APPARENTLY IS DIVIDING WITHIN THE CYST, OR 

 RATHER WAS APPARENTLY IN PROCESS OF DIVISION 

 AT THE TIME OF THE ENCYSTMENT. 



