288 



LOUISE HOVf GREGORY. 



ing of one half of a cross section through a segment toward the 

 anterior end of the body, showing the position of the sex organ 

 in its relation to its surroundings. 



Animals killed during the months of April, May, June, July 

 and August differed from one another with respect to the form 

 and contents of the sex organ, as well as to the condition of the 

 body cavity. 



All specimens killed in April and the early part of May were 

 found to be pure females. Fig. i is a cross section through the 

 body of a specimen killed April 27, showing the organ, which is 

 a pure ovary. Fig. 2 is a magnified drawing of the ovary in 



Fig. i. This is a typical organ found 

 during the early months. It is a long, 

 somewhat pear-shaped body, one end 

 extending into the body cavity, the other 

 end being attached by a band of tissue 

 to the lateral muscles. At this same 

 end is found the blood vessel. The 

 cells are irregularly arranged and are 

 in different stages of development ; the 

 majority of them contain very large 

 nuclei with one or more nucleoli. In 

 this organ there seems to be no definite 

 arrangement of cells, large and small 

 being intermingled. In the early part 

 of April the organ is much smaller 

 but it has the same characteristics as 



the one described. In none of these animals are the sex pro- 

 ducts found free in the body cavity. 



The animals killed during the months of May, June and July, 

 with one exception, were hermaphrodites. During these months 

 large masses of spermatozoa, and ova varying from the small 

 oogonium to the large ovarian egg, were found free in the body 

 cavity. Fig. 3 is a section through the body cavity of a speci- 

 men killed July 13, showing the different stages in the develop- 

 ment of the ova as well as the masses of spermatozoa, both found 

 free from the organ. A and B are sections through the outer 

 surface of two large ovarian eggs. In the next section they have 

 an appearance similar to that of C, D and E. 



FIG. 2. Magnified draw- 

 ing of ovary in Fig. I. bv, 

 blood vessel ; ov, ova. 



