THE OPALIlSiID CILIATE IXFUSORIANS. 



119 



'• the rest of the nuclear contents show a finely reticulate structure." 

 Bezzenberger's figures of stages of mitosis in unicellular [daughter] 

 individuals are copied in figure 83. The macrochromosomes are not 

 distinguished by Bezzenberger from the microchromosomes, his fig- 

 ures apparently showing only the former. If this be so, the number 

 of macrochromosomes seems larger than in any other binucleated 

 Opalinid now known, there appearing to be probably 12. (Fig. 83, 

 d and e.) I regret that I have not material for restudy of the mitosis 

 in this species. 

 In the section of this paper which discussed the geographical dis- 



d 



no. 85. ZBLLEKIELLA ANTILLIENSIS, a series of nuclei, X 1,000 DIAMETERS : a, TWO 



PAIRS OP NUCLEI FROM A CELL IN LONGITUDINAL FISSION. (ONLY THE MACROCHROMATIN 



IS DRAWN. Usually fission is completed before the nuclei reach this stagd, 



DELAY IN this CASE BEING DUB TO KEEPING THE ANIMAL SEVERAL HOURS IN SALT SOLU- 

 TION); 1), A PAIR OP NUCLEI BROM A LARGE CELL; AS IS FREQUENT, THE ANTERIOR 

 NUCLEUS IS IN A SLIGHTLY MORE ADVANCED STAGE OF MITOSIS THAN THE POSTERIOR 

 NUCLEUS ; IX IS ALMOST IN THE CHARACTERISTIC IMPERFECT EQUATORIAL PLATE STAGE ; 

 THi: I'OSTERIOR NUCLEUS IS PASSING OUT OF THE SKEIN STAGE, THE MACROCIIRO JIOSOMES 

 BEING NEARLY ALL DEFINED ; SOME OF THE LINES OF MACROCHROMATIN GRANULES ARE 

 DRAWN IN BACH NUCLEUS ; C, A PAIR OF NUCLEI PASSING FROM THE EQUATORIAL PLATE 

 STAGE INTO AN EARLY ANAPHASE. DETAIL IS SHOWN ONLY IN THE ANTERIOR NUCLEUS. 



tribution of the Opalinids doubt is expressed of the assigning of 

 this Zelleriella to Bufo melanostictus from "Asia." (See page 327.) 



ZELLERIELLA ANTILLIENSIS (Metcalf) (figs. 84-86). 



Opalina antilliensis Metcai.f (1914). 



The type specimen of this species has now been deposited in the 

 United States National Museum as Cat. No. 16483. 



Host. — Bufo marlnus (Linnaeus), from Jamaica, and from the 

 Bermudas. 



