72 J. T. CUNNINGHAM. 



sexual organ, and I have only found it in specimens in which 

 the eggs were very small, that is, less than 4 mm. in length. 



Fi"-. 10 shows a prepared and stained section of the male 

 portion of the organ in such a hermaphrodite specimen, under 

 a magnifying power of 100, and it will be seen that it agrees 

 in all respects with the figure of a section of the testis. 



In one of the hermaphrodite specimens obtained on January 

 29th last, I discovered, on teasing up a portion of the testicular 

 portion of the generative organ, a number of spermatozoa, and 

 stages of spermatogenesis. The various structures as seen in the 

 fresh state are shown in fig. 14. The spermatozoa possess a pear- 

 shaped head, which is very highly refringent, and has a distinct 

 outline ; round the posterior thicker end of the head is a trans- 

 lucent protoplasmic body, which is produced into a long tail. 

 These spermatozoa were not moving, and were not present in 

 vast numbers as is usually the case. The specimen from which 

 they were taken had been dead a few hours. I have not been 

 able to obtain a sufficient supply of material to make a com- 

 plete study of the spermatogenesis ; the few stages I could make 

 out are shown in fig. 14. In some cases two spermatozoa were 

 connected by their tails, and on the connecting thread thus 

 produced were slight dilatations composed of clear protoplasm. 

 In other cases a cell somewhat spherical in shape gave off two 

 processes, one of which was the tail of a spermatozoon, while 

 the other terminated in a point, the head of the spermatozoon 

 belonging to the process having probably become detached in 

 the operation of teasing. There were also seen cells in which 

 were present one or more structures resembling the heads of 

 the spermatozoa. These structures and the heads of the 

 spermatozoa stain deeply in carmine; they doubtless consist 

 of nuclear substance, but I have not been able to trace their 

 origin from the nuclei of the cells in which they occur. It is 

 evident that the cells and spermatozoa described were derived 

 from the spherical cells of the testicular capsules. These cells 

 apparently develope the heads of the spermatozoa which then 

 grow out from the cells, trailing a thread of protoplasm which 

 forms the tail. The curious thing about the spermatogenesis 



