ANNELIDES. 143 



transverse muscle passes from tlie rectum to the opposite side of the body, 

 and the rectum is attached to the adjacent wall by a large bundle of 

 muscular fibers. Muscles of the body-waU form a continuous layer, with- 

 out distinct fascicles. 



NEMEETn^A. 



Amphiporus Stimpsoni Verrill. 



Ommatoplea Stimpsoni Gibard, in Stimj)son, Invert, of Grand Manan, p. 28, fig. 

 18, 1853. 



Gravel beach, low-water, Cumberland Gulf, June 1, 1878, lot 663. 

 ^' Color, deep purplish brown above, lilac beneath." Also from reef in 

 Penny Harbor, October 5, 1877, lot 222. 



Amphiporus, sp. 



Body thick, depressed, somewhat tapered to both ends, 25™"" to 35™™ 

 long, as contracted in alcohol. Head with a small roundish cluster of 

 minute ocelli on the pale antero-lateral margins. Neck with a slightly 

 marked transverse groove, converging backward in form of a Y, on the 

 dorsal surface. Color, in alcohol, dark bluish green ; the under surface 

 and margins of head yellowish white. In life, " bright pea-green." 



Penny Harbor, Cumberland Gulf, lat. 66°, October 4, 1877, lot 225. 

 Arctic Island, low-water, September 13, 1877, lot 66. 



