148 NATUKAL HISTORY OF ARCTIC AMERICA. 



on some of the other tubercles. The form of the body is more or less 

 cylindrical, often two inches or more high and one in diameter, after 

 preservation in alcohol. The tubes are terminal and divergent. Color, 

 in life, reddish. 



The very young specimens are low and nearly flat in contraction, and 

 nearly smooth. 



It is common on the Grand Banks, where it grows to a large size. It 

 lias not been found on the New England coast. 



Lot No. 592, head of Cumberland Gulf, attached to roots of kelp,, 

 May 19, 1878. Both adult and young. 



Halocynthia echinata Verrill. 



Ascidia echinata LINN. FABRICIUS, Fauna Gronlandica, p. 331. 

 Cynthia echinata STIMP., Invert, of Grand Manan, p. 20, 1854. BIXNEY, in Gould, 

 Invert, of Mass., p. 18, pi. xxiii,fig. 3260. VERRILL, Amer. Journ. Sci. i,p. 96,. 

 1871. 



Lot No. 596, Cumberland Gulf, May 10, 1878. 



Besides the two species of this genus brought home by the expedi- 

 tion, the following occur on the American coast north of Cape Cod : 

 H. pyriformis (Eathke), Southern New England to Greenland j iff. ml- 

 losa (Fabr.), perhaps young of the preceding, Labrador to Greenland $ 

 H. tuberculum (Fabr.) = Cynthia carnea (Ag.) Yerrill = C. placenta Pack- 

 ard (young), Cape Cod to Greenland ; H. pulcliella Yerrill (as Cynthia)^ 

 Eastport, Me., to Grand Banks; H. partita (Stimp.), Massachusetts 

 Bay to North Carolina. 



POLYZOA. 



Crisia eburnea (L.) Laraouroux. 



Gulf of Cumberland. One specimen. 



Diastopora patina (Lam.) Smitt. 



Annanactook Harbor, on Laminaria, 7 fathoms, May 19 ; and on 

 Halocynthia rustica, head of Cumberland Gulf, May 5, 1878. 



Alcyonidium mytili Dalyell. 



Gulf of Cumberland, on algae. Godthaab, Greenland, on carapax of 

 Hyas araneus. 



Gemellaria loricata (Linne) Bask; Smitt. 



Gemellaria dumosa STIMPSON, Invert, of Grand Manan. 



Specimens three inches high. Penny Harbor, Cumberland Gulf, low- 

 water, October 4, 1877, lots 226 and 238, covered with fry of Crenella 

 faba ; same locality, May 28, 1878. 



