1 86 CARRIE I. WOOLSEY. 



Plate VI. 

 Jamaicana unicolor n. sp. Caudell. 



Spermatogonia! figures of two members of this species. Thirty-five rods are 

 found in the one; thirty-one rods and two V's are found in the other. Figures 65-67 

 are first spermatocytes. 



Figs. 54-57. Spermatogonia! figures of individual 430. There are thirty-five 

 chromosomes of the rod type here, paired and numbered according to 5ize. No. 18 

 is the unpaired sex chromosome. 



Figs. 58-60. Spermatogonia! figures of individua! 560 showing thirty-one rods 

 and two V's in each. No. 18 is the unpaired sex-chromosome. Just the iargest 

 chromosomes are paired and numbered. 



Figs. 61-64. Spermatogonia! metaphases. Although the chromatin material 

 is much massed, the sex and the two V-chromosomes are very prominent and 

 distinct. 



Fig. 65. First spermatocyte of individua! 560 showing the multiple or bi-tetrad 

 formed by the two V's. 



Fig. 66. First spermatocyte prophase showing the complete number of chro- 

 mosomes in individual 560, — fifteen rod tetrads, the bi-tetrad, and the sex-chromo- 

 some. 



Fig. 67. The ring-shaped bi-tetrad more condensed in a latter prophase. 



