2~O C. L. TURNER. 



small and has no oviduct attached to it. The openings of the 

 sperm ducts at the base of the fifth walking legs are in the same 

 position as those of the normal male but are smaller and are not 

 so prominent. The first abdominal appendages are shaped much 

 like those of the normal, second form male but they are a little 

 smaller and are more slender in the basal third. The second 

 abdominal appendages are like those of the normal female with 

 the addition of a marked triangular shoulder upon the endopodite, 

 indicating a tendency on the part of the appendage to develope 

 specific male characteristics. 



This specimen was dissected and it was found that the internal 

 structures were those of a female. The extra oviducal opening 

 and the openings at the base of the fifth walking legs had no 

 internal tubes connected with them. There was no trace of a 

 spermary. 



Specimen number n is 62 mm. long and is identical in its 

 external peculiarities with specimen number 9. Like specimen 

 number 9 also, it was bearing young embryos upon the swim- 

 merets when taken and was of course a functional female. With 

 the eggs so recently discharged it would be expected that the 

 ovary would be depleted and small. A large genital gland has 

 been found, however, which is irregular in shape and seems to be 

 made up of unlike parts. It is possible that the structure may 

 prove to be an ovo-testis. 



Specimen number 12, 53 mm. long, when taken was bearing 

 embryos which were in an advanced stage. These embryos were 

 reared in the laboratory and forty-nine of the sixty reached a 

 stage in which the secondary sexual characters had become distin- 

 guishable. All the embryos were female and all were normal. 

 As in specimen number 1 1 a large irregular genital gland has been 

 found but there are no ducts except the normal oviducts. Exter- 

 nally this specimen is with the exception of its size almost identical 

 with specimen 1 1. 



Specimens number ij to ig inclusive (Fig. 6) are alike in their 

 peculiarities, all being normal females as evinced by their internal 

 and external organs but bearing in addition one male secondary 

 sexual character, namely a hook on the left third walking leg. 

 The lengths of the specimens number 13 to 19 are respectively 

 63 mm., 47 mm., 49 mm., 47 mm., 42 mm., 45 mm., and 5 omm. 



