[39] ANNELIDS OF PEOVINCETOWN, MASS. 737 



MYXICOLA {Koch) Malmfireii. 

 Myxicola Steenstrupi Kroyer. 



Myxicola SUtenstrupi KkOyek. Bidiag til Kuutls., om Salxsllcrne,, i>. 'Xi. 1856. 



Malmgren. Nord. Hafs-Auu., p. 4(»8. IHt).'.. Fl. xix, lig. IM). 

 Auniilcita Pulycht«ta, p. 221. 18GT. 

 Myxicola Sarsi Kkover. Op. cit.. ji. 9. 185{). 



Sars. Christ. Vid. Selsk. Forb.. p. 130. 18(51. 



Body white or yellowish white. The anterior segments, o-(i, luay he 

 brown, or white, or mottled. After the fourth segment there may be 

 one, two, or three circular brown specks on the sides of ea<;li segment. 

 These spots fail on a few of the posterior segments, but on the sides 

 of the anal segment they are numerous, from four to twelve on ejich side, 

 according to the size of the specimen. The brauchias ait; greenish yel- 

 low at base, with their outer two-thirds reddish brown, or tliey may be 

 greenish white throughhout; branchial cirri of the same color as the 

 branchiai. 



Dredged in 25 fathoms; sand and shells. 



Family SERPULID^. 



HYDEOIDES Gunnerus. 



Hydroides dianthus VerrilL 



Serpula dianthus YERRiLh. Invert. An. of Vin. Sound, p. 020. 1874. 

 Hydroides dianihus Verriix. Proc. Acad. Nat. Sci., p. 300. 1878. 



Webster. Annel. Chiet. of the Virginian Coast, p. 26(5. 1879.— 

 Of New Jersey, p. 128. 1880. 



Not common. Low water, on shells, etc. 



SPlliOliBiS Dauflin. 



Spirorbis borealis Daudin. 



Very common at low water, on sea weed, etc. 



Genus incerta' sedlH. 



We collected a single injured specimen, which we have so far been 

 unable to refer to any described family. It presents, however, so many 

 I)eculiarities that it seems desirable to describe it as far as possible. 



THAUMASTOMA n. g. 



Head rounded behind, flattened and elongated in front ; without ap- 

 pendages. Proboscisprotrusible, digitate at extremity. No jaws. First 

 segment with median cirrus. Dorsal setae of first segment much elon- 

 gated, directed forward. Ventral setae of first two segment in two series ; 

 S. Mis. no 47 



