HERMAPHRODITISM IN SABELLA MICROPH- 

 THALAMA VERRILL. 



LOUISE HOYT GREGORY. 



In Sabclla microphtha/aina Verrill, a paired, hermaphroditic 

 sex organ appears in each segment of the body posterior to the 

 pharynx. The study of this hermaphroditic condition was sug- 

 gested by Professor Treadwell, who collected the material at 

 Woods Hole, Massachusetts, in 1902-1903. The specimens 

 were preserved in Hermann's fluid and stained in iron hsema- 

 toxylin. 



In general, the arrangement of organs as seen in cross section 





c/f, 



FIG. I. Semi diagrammatic cross section through the anterior portion of the body; 

 bv, blood vessel ; cm, circular muscles ; dint, dorsal longitudinal muscles ; ep, epi- 

 dermis ; int, intestine; n, nerve cord; ov, ovary; vim, ventral longitudinal muscle; 

 vv, ventral blood vessel. 



through the body is similar to that of other annelids. The 

 paired sex organ is found on the dorsal side of the ventro-lateral 

 bands of longitudinal muscles in the anterior end of each segment 

 posterior to the setae. It is supplied with blood from branches 

 of the ventral blood vessel. Fig. i is a semi-diagrammatic draw- 



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