378 



L. J. BLACKER. 



side with the upper part of the tail fin colored yellowish-orange. 

 Male No. 44 had three black spots on each side while No. 47 

 possessed only one on each side. They were born on the i8th of 

 September, 1924. Both fish developed and remained alike until 

 May, 1925, from which time on male No. 44 gradually lost its 

 coloration and on June of the same year was, so to speak, color- 

 less (Fig. 40). Both males were killed and fixed in formol- 

 alcohol, sections made 6-8 micron in thickness and stained with 

 hematoxylin. The histological picture of the normal male No. 

 47 showed a large testis and not less than 70 spermatocysts can 

 be counted on one section. The connective tissue is poorly 

 developed (Figs. 6 and 7). In case of male No. 44, the testes is 



JO // 



FIGS. 10-12. 



only one fourth as large as that of its normal brother, only 16-17 

 spermatocysts can be found in one section with spermatogenesis 

 almost reduced to nil. The connective tissue however is very 

 well developed (Figs. 8 and 9). In the middle of the gonad of 

 male No. 44 are found two cysts filled with an almost homo- 

 geneous mass. These cysts appear to be much like ova in process 

 of degeneration. 



7. Fish No. 59. The Hemaphrodite For this specimen I am 

 very much indebted to Mr. N. J. Dragomiroff, who sent it to me 

 from the University of Kiew. This fish had died 6 months of 

 age and reached me preserved in Tellyesniczky's fluid. 



The body of the Libistes hermaphrodite measures 37 mm. in 

 length, which is a female characteristic, for the males never exceed 



