[25] ANNELIDS OF PROVINCETOWN, MASS. 723 



Family GLYCERID^. 



EHYNCHOBOLUS Claparede. 



Ehynchobolus dibranchiatus Verrill. 



Glycera dibranchiata Ehlers. Borstenwiirmer, p. 670, pi. xxiv, figs. 1, 10-28. 1868. 



Grube. Jahres-Beiiclit der ScMes. Gesell. fiir vater liin Cultur, p. 64. 1869. 

 Ehynchobolus dibrancliiatus Vkrrill. Invert. An. of Vin. Sound, etc., p. 596, pi. x, 

 figs. 43,44. 1874. 

 Webster. Annel. Chaet. of the Virginian Coast, etc., p. 245. 1879. Armel. 

 Chset. of New Jersey, p. 117. 1880. 



Very common in sand at low water. 



GONIADA Audouin and M. Edwards. 



GoNiADA GRACILIS Verrill. 



(Pl. V, Figs. 49-52.) 



Eone gracilis Verrill. Invert. An. of Vin Sound, etc., p. 596. 1874. 

 Goniada gracilis Verrill. Proceedings U. S. National Museum, p. 174. 1879. 



We found in the fine sand of the harbor, at about half-tide, a number 

 of specimens evidently referable to Goniada, and which we regarded as 

 undescribed. Professor Verrill, however, regarded them as belonging 

 to the species described by him as JEone gracilis, since changed to Goni- 

 ada gracilis, as above. 



The apex of the head (fig. 49) is nearly hexagonal. 



The antennae are composed of three articles, of which the inner forms 

 over half the entire length ; the outer articles are about equal in length ; 

 the diameter decreases progressively; external article very delicate. 



The first and sixth segments of the head bear each a pair of minute 

 eyes ; those on the sixth segment not always demonstrable in alcoholic 

 specimens. 



The dorsal cirri on a few of the anterior segments and the ventral 

 cirri back of the middle of the body are rounded ; elsewhere they are 

 somewhat flattened, as is, also, the lower lip of the lower ramus. 



The dorsal ramus appears at the 27th segment. 



The setae of this ramus are short, simple, a little curved at the apex. 



From the 2Gth-30th segment the long compound setae of the ventral 

 ramus become much elongated, the appendix, especially, being very long 

 and delicate. (Compare fig. 50 with tig. 52.) 



This may be a sexual peculiarity ; but, as all the specimens taken were 

 sexually mature, we had no means of determining this point. 



The normal color would seem to be yellowish-white ; this changes to 

 pure white in the males after the 30th, and to flesh-color, varying from 

 light to dark, in the females, after the 20th segment. The eggs are 



