[39] ANNELIDS OF PROVINCETOWN, MASS. 737 



MYXICOLA {Koch) Malmgren. 

 Myxicula Steenstrupi Kroijer. 



Myxicola Steenstrupi KrOyer. Bidrag til Kuuds., om Sabellerne, p. 35. 185G. 



Malmgren. Nord. Hafs-Auu., p. 408. 1865. PL xix, tig. 00. 

 Annulata Pulychaita, p. 227. 1867. 

 Myxicola Sarsi Kroyer. Op. cit., p. 9. 1856. 



Sars. Christ. Vid. Selsk. Forh., p. 130. 1861. 



Body white or yellowish white. The anterior segmeiits, 3-6, may be 

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

 one, two, or three circular brown specks on the sides of each 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 each side, 

 according to the size of the specimen. The branchiae are greenish yel- 

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

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

 branchiffi. 



Dredged in 25 fathoms ; sand and shells. 



Family SERPULID^. 



HYDEOIDES Gunneriis. 



Hydroides dianthus Verrill. 



Serpula dianthus Verrill. Invert. An. of Vin. Sound, p. 620. 1874. 

 Hydroides dianthus Verrill. Proc. Acad. Nat. Sci., p. 300. 1878. 



Webster. Annel. Chast. of the Virginian Coast, p. 266. 1879.— 

 Of New Jersey, p. 128. 1880. 



ater, on shells, etc. 



SPIRORBIS Daudin. 



Spirorbis borealis Daudin. 



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



Genus incertce sedis. 



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

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

 peculiarities that it seems desirable to describe it as far as possible. 



THAUMASTOMA h. g. 



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

 pendages. Proboscis protrusible, digitate at extremity. No jaws. First 

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

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

 S. Mis. 110 47 



