236 



Annelida Chcetopoda 



the ventral cirrus, and a similar somewhat larger plate on 

 the lower ramus (f. 73). On the segments thus changed 

 the cultrate (sexual) setse nearly replace all other forms. 

 In males, with feet changed to the same extent, there 

 were no cultrate setae. In both male and female, the anal 

 segment is crenulated, and shorter than in the asexual 

 form (f. 71). In both, the feet were much swollen at base. 

 It would not be safe to assume that the changes in the 

 femal6 stop at the point indicated above; for although 

 they seemed to be adult, yet so did the males, and yet 

 Prof. Yerrill has shown that the changes in the adult 

 male are much greater than appeared probable from the 

 condition of my specimens. The change in the anal 

 segment occurs first. Many specimens, in which the 

 sexual elements w^ere perfectly distinct, were unmodified, 

 save in the anal segment. 



Low water, mud and sandy mud: often in very soft 

 mud, brackish water, being the only annelid that I found 

 living under such conditions. This last station was very 

 near high water mark. 



Fam. EUmCID^. 

 DIOPATRA Aud. and M. Ed. 

 DiOPATRA CUPREA Clpd. 

 Nereis cuprea Bosc. Hist. Nat. des Vers, vol. i, p. 143. 

 Eunice cuprea Quate,. Hist. Nat. des Anneles, vol. i, p. 331. 

 Diopatra cuprea Clpd. Annel. Chetopodes du G. de N., p. 432. 



Verb. Invert. An. Vin. Sound, p. 593, pi. xiii, figs. 67, 68. 



I have never seen Bosc's work. The synonomy given 

 above rests on the authority of Claparede. 



Common, especially near high water mark. 



MARPHYSA Quat. 



Marphysa sanguinea Quat, 



PL. YI, FIGS. 76-80. PL. VII, FIGS. 81-83. 



Nereis sanguinea Montagu. Linn. Trans., xi, p. 20, pi. iii, f. 1. 



