1903.] NATURAL SCIENCES OF PHILADELPHIA. "93 



SOME PELAGIC POLYCH^TA NEW TO THE WOODS HOLE FAUNA. 

 BY J. PERCY MOORE. 



The pelagic annelid fauna of southern Xew England has received 

 but little attention and, with the exception of larval forms, some 

 Sillidffi and the epitokous phases of some nereids, etc., practically noth- 

 ing relating to it has been recorded. With the exception of Tomopteris 

 all of the genera discussed in the following pages are new to the region. 



AmpMnome pallasii Quatrefages. 



From several logs covered with goOse barnacles (Lepas anatifera) 

 which came ashore in Vineyard Sound on August 4 and 5, 1903, a large 

 number of examples of this species were taken. Most of them meas- 

 ured from 2 to 2^ inches in length, and their size and peculiar bluish- 

 brown color served to conceal them admirably among the stalks of 

 the barnacles and in the crevices to which they clung. Several were 

 observed to squeeze between the valves of barnacles and to feed on 

 their soft parts, and the digestive tracts of others were filled with a 

 soft pasty substance apparently composed of the tissues of those 

 animals. 



There can be no doubt that these specimens are of the species de- 

 scribed and figured under the above name l^y Ehlers in his Florida 

 Anneliden, and which is probably a regular Gulf Stream waif. Under 

 the name of A. rostrata (Pallas) IMcIntosh^ describes an AmpMnome 

 taken from a floating log near the Bermudas. From his description 

 the Woods Hole specimens differ most obviously in having the short 

 notopodial seta with serrated tips more slender instead of stouter 

 than the longer notopodial setffi, and in the different form of the ter- 

 minal knobs of the very short spines. The shape of the cephalic carun- 

 cle and the arrangement of the seta? also present slight divergences, but 

 in all other respects the resemblance is very close. Prof. Mcintosh 

 apparently considers the two species identical. 

 Hipponoe gaudichaudi Aud. and M. E. 



On the same floating logs that yielded the Amphinome ^\•ere found 

 many fine examples of this species, which agree perfectly with the 

 original description and with Mci ntosh's ^ detailed account and figures. 



1 Challenger Reports, XII, p. 21. 



2 Challenger Reports, XII, p. 30 



