36 An7ielida Ghoetopoda 
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 setas. 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 
female stop at the point indicated above ; for although 
they seemed to be adult, yet so did the males, and yet 
Prof. Verrill 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 were 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. EUNICID^. 
DIOPATRA Aud. and M. Ed. 
DiOPATRA CUPRBA Clpd. 
Nereis cuprea Bosc. Hist. Nat. des Vers, vol. i, p. 143. 
Eunice cuprea Quatr. Hist. Nat. des Anneles, vol. i, p. 331. 
Diopatra cuprea Clpd. Annel. Cbetopodes du G. de N., p. 432. 
" " Verr. 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. VI, FIGS. 76-80. PL. VII, FIGS. 81-83. 
Nereis sanguinea Montagu. Linn. Trans., xi, p. 20, pi. iii, f. 1. 
