PEOP. 0. STEWABT ON A HEBMAPHRODITE MACKEREL. 71 



me in a perfectly fresli state ; but as it had been cleaned by the 

 fishmonger, its girth could not be determined. The genital organs 

 had been detached from the dorsal wall of the body-cavity, but 

 were still connected with the uro-geuital pore. 



The right ovary is full of well-developed ova. It is 150 millim. 

 in length ; in front it has a rounded commencement with a dia- 

 meter of 27 millim., and from this point gradually tapers to the 

 posterior extremity. Along the whole length of the dorsal 

 border of the ovary extends a testis which somewhat exceeds 

 the ovary in bulk ; it slightly overlaps the outer surface of the 

 ovary, and still more so the inner ; the posterior portion of the 

 inner surface of the ovary for a distance of 15 millim. has the 

 testicular structure, and is directly continuous with the general 

 body of the testis above. In front the testis projects 16 millim. 

 beyond the ovary, and has to its inner side a bilobed mass of 

 testis in contact, but apparently not continuous, with the main 

 body. 



The left ovary is 134 millim. long. In front it has about the 

 same diameter as the right ; but this diameter is retained until 

 about 40 millim. from the posterior extremity, when it begins to 

 taper. The natural bulk of the left ovary somewhat exceeds the 

 right. 



The whole length of the dorsal border of the left ovary, with 

 the exception of 15 millim. at its exterior extremity, gives attach- 

 ment to a testis which overlaps the outer surface of the ovary 

 for about half its diameter. 



The extreme tip of the ovary is capped with a cocked-hat- 

 shaped testis-mass having 14 millim. basal diameter. Dorsally 

 halfway between the main body of the testis and the above-men- 

 tioned lobe is a small patch of testicular tissue flush with the 

 general surface of the ovary. 



Both ova and spermatozoa were perfectly developed, and the 

 ovaries and testes of approximately equal size. 



