of the Virginian Coast. 35 
Nereis virens Sars. 
Nereii virens Sars. Beskrivelser og iakttagelser, etc., p. 58, pi. x, f. 27. 
" " Ehlers. Borstenwiirmer, p. 559, pi. xxii, figs. 29-32. 
" " Verrill. Invert. An. Vin. Sound, p. 590, pi. xi, figs. 47-50. 
Nereis grandis Stimp. Invert, of Grand Manan, p. 34, f. 24. 
Nereis yanlciana Quat. Hist, des Anneles, vol. i, p. 533, pi. xvii, figs. 7-8. 
Alitta virens Knbg. Annulata Nova, p. 112. 
" " Mgrn. Nord. Hafs-Ann., p. 183.— Annulata PolycLajta, p. 172, 
pi. iv, f. 19. 
One specimen only was collected. 
Nereis limbata Ehlers. 
PL. VI, FIGS. 70-75. 
Ehxers. Borstenwiirmer, p. 567. 
Verrill. Invert. An. Vin. Sound, etc., p. 590, pi. xi, f. 51 ; also p. 318. 
My specimens, in most particulars, agree perfectly with 
Ehlers' description, but there are some not unimportant 
difierences. Ehlers states that the dorsal cirri do not 
extend beyond the lingulse. This is the case with my 
specimens until the liiigula is enlarged and flattened. 
Again Ehlers states that the dorsal cirrus, borne by the 
lingula, is never terminal. I find that on a few of the 
posterior segments it is terminal (tigs. 70-71). I have re- 
ceived from Prof. Verrill specimens referred by him to 
Ehlers' species which agree perfectly with mine. Verrill 
(1. c. p, 318) says of the females that " the middle region 
does not become difierent from the anterior, as in the 
male." Up to the time of the reception of the above 
specimens of adult males, it was my belief that the sexual 
forms were alike, and that no great change occurred in 
either. In fact, the changes iu the adult male are as well 
marked as in any species observed by me. Certain changes 
also occur in the females. The eyes are enlarged so as 
nearly to touch each other. On the 18th setigerous 
segment small membranous plates appear at the base of 
