of the Virginian Coast 



235 



Nereis virens Sars. 



Nereis virens Sars. Beskrivelser og iakttagelser, etc, , p. 58, pi. x, f . 37. 

 " " Ehlers. Borstenwiirmer, p. 559, pi. xxii, figs. 29-32. 

 " " Verrlll. Invert. An. Vin. Sound, p. 590, pi. xi, figs. 47-50. 

 Nereis grandis Stimp. Invert, of Grand Manan, p. 34, f. 24. 

 Nereis yankiana 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 Polychseta, p. 172, 

 pi. iv, f. 19. 



One specimen only was collected. 



Nereis limbata Ehlers. 



PL. VI, FIGS. 70-75. 



Ehlers. Borstenwiirmer, p. 567. 



Verrlll. 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 

 differences. Ehlers states that the dorsal cirri do not 

 extend beyond the lingulse. This is the case with my 

 specimcQS 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 (figs. 70-71). I have re- 

 ceived from Prof. Verrill specimens referred by him to 

 Ehlers' species which agree perfectly with mine. Yerrill 

 (1. c. p. 318) says of the females that " the middle region 

 does not become different 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 in 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 



