ARREST OP DEVELOPMENT. 105 



d. 

 Syn. Hermaphrodisme bisexuel, Geoff. 



Although there is no evidence that true hermaphrodism is an 

 arrest of development, it has been thought advisable, in the 

 absence of all knowledge as to its nature, to place it in the same 

 series as those remarkable conditions known as Androgyny and 

 Gynandry, with which it appears to have some connexion. 



True hermaphrodism is not uncommon as a malformation 

 amongst unisexual Invertebrates. Sometimes one side of the 

 body is male and the other female; this is the usual form 

 amongst insects. Another form of true hermaphrodism has 

 been frequently observed amongst fish, in which a portion of 

 one or both ovaries is differentiated into a test is. The following 

 preparations are of this kind : 



446. The ovaries and external generative aperture of a Codfish 



injected. A large piece of convoluted testicle is inti- 

 mately connected with the wall of the right ovisac, in the 

 middle of its outer margin. It is uncertain whether the 

 seminal ducts in this case open into the ovisac ; but in a 

 precisely similar case described by Dr. J. A. Smith* there 

 were five distinct ducts perforating the ovisac and open- 

 ing into the cavity of the ovarium. 



Presented by W. Lynn, Esq., 1825. 



447. A similar preparation, in which the posterior end of the 



left ovary is united with a convoluted mass of testicle 

 almost equalling the ovary in size. 



Presented by Sir A. Carlisle, 1821. 



448. A similar preparation, but not injected, in which a portion 



of convoluted testicle is attached to the anterior end of 

 the left ovary. The testis is about half as large as the 

 ovary. The right ovisac has been opened to show the 

 tufts of ova. Presented by Sir E. Home, Bart., 1802. 



449. The ovaries of a Fish, probably a small Cod, with a very 



small convoluted mass of testes attached to the anterior 

 extremity of the right ovary. Mus. Brit. 



* Journal of Anatomy and Physiology, 1870, p. 256. 



