SABELLA M1CROPHTHALMA VERRILL. 



289 



During Aueust both hermaphrodites and .females were found, 



o & 



the former being the more common. 



Of the entire number examined, one third were distinctly female, 

 and all but three of this number appeared among the specimens 

 killed during April. No pure males were found in the material 

 at my disposal. From these observations, it appears that the 

 sexes are distinct at the beginning and end of the season, while 

 during the middle of the season the sexes are united. 



o 



FIG. 3. Section through body cavity showing free ova and spermatozoa, a, b, c, 

 d, ovarian eggs ; sp, spermatozoa. 



A typical hermaphroditic organ is seen in Fig. 4. It differs 

 from the typical ovary in that it is shorter, broader, and more 

 kidney shaped. Although ova and spermatazoa are found scat- 

 tered throughout the organ, the majority of the ova appear massed 

 together at the broader anterior end, while the larger number of 

 male cells are found at the opposite end of the organ near the 

 blood vessel. The ova are all in about the same stage of develop- 

 ment. The cells on the very outer edge are ready to fall into the 

 body cavity, where they undergo their further development. The 

 male cells are in different stages of J<aryokinesis. In many cells 

 the chromatin appears as a large, deeply stained mass, in some 

 spindle shaped, in others in the form of an aster. In a few cells 

 spermatozoa are found almost mature. Outside of the organ in 



