456 



position, of the sexual organs. The female genital organs lie 

 either on one or both sides of the vulva, and the branches are 

 either straight or reflexed. Letting a hyphen represent a straight, 

 and a quotation mark a reflexed branch, we have — 



-52"1- indicates two straight branches, one on either side of the vulva. 

 '52'1' indicates two reflexed branches, one on either side of the vulva. 

 52 '1- indicates one straight branch behind the vulva. 

 52'r indicates one reflexed branch behind the vulva. 

 -52 "1 indicates one straight branch in front of the vulva. 

 '52 '1 indicates one reflexed branch in front of the vulva. 



In case of the male — 



•M- indicates two straight testicles extending in opposite directions. 

 -M indicates one straight testicle extending forwards. 



M- indicates one straight testicle extending backwards. 



M' indicates one reflexed testicle extending backwards. 

 'M indicates one reflexed testicle extending forwards. 



It should be borne in mind that the marks in the case of the 

 male refer exclusively to the form and position of the testicle 

 proper, that is to say, that portion of the generative apparatus 

 beyond the vas deferens. When two testicles are present their 

 limits are easily defined, for the point where they join marks the 

 beginning of the vas deferens. When but a single testicle exists 

 it is marked ofi" from the vas deferens by a constriction in the same 

 way that the vas deferens is marked off from the ductus ejacu- 

 latorius. 



The percentage of the body occupied by the sexual organs is 

 indicated by superior or reference figures placed at the right of and 

 above the fourth term. Thus '50'^ represents a female sexual 

 apparatus whose vulva is central, and whose symmetrically reflexed 

 branches occupy 30% of the length of the body. 



One may quickly familiarize himself with this new formula by 

 imagining that the horizontal line represents the animal under 

 consideration, and that the dimensions are written alongside, 

 opposite the proper parts, — that is, opposite the base of the 

 pharynx, the nerve-ring, the base of the neck, the vulva, and the 

 anus. 



