PEOCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 197 



as long as the oral. Its orifice is surrounded by six lobes and ocelli, 

 like those of the other. Test moderately thick and firm, somewhat 

 wrinkled, nearly glabrous, translucent, dull yellowish, blotched more or 

 less with russet-brown. The internal organs show through faintly as 

 yellow and dark markings. Height, in expansion, 32^""^; greatest 

 diameter, IT™-^; length of oral tube, ll^i"; of anal, 4'"'» to 5""^. 

 Johnson's Bay, near Eastport, Me., 12 fathoms, stony, August 8, 1872. 



Halocynthia Verrill= Cynthia Savigny (non Fabr., 1808). 

 Bulletin National Museum, No. 15, p. 147, 1879. 



This name was proposed for the restricted genus Ci/nthia of Savigny, 

 characterized by having both apertiu'es quadrangular, and ovaries de- 

 veloped on both sides. The species now known from our northeast 

 coast are as follows : 



Halocyntlda ijyriformis (Eathke) = Cyntliia pyriformis authors. 



Halocynthia rustica (Linne) = Ascidia monoceros Moller. 



Salocynthia tuberctdum (Fabr.) = Cynthia carnea (Ag.) Yerrill. 



Halocynthia pulchella Verrill = Cynthia jpulchella Yerrill. 



Halocynthia echinata (Linne) = Cynthia echinata authors. 



Halocynthia partita (Stimp.) = Cynthia partita Stimpson. 



MOLLUSCA. 



Xylophaga dorsalis (Turton). 



Many lining specimens of this species have been found in bits of old 

 wood, dredged in Casco Bay; in 100 to 110 fathoms, about thirty miles 

 oft' Cape Ann ; and in various parts of Massachusetts Bay and Cape 

 Cod Bay. It has previously been recorded by Mr. J. F. Whiteaves from 

 Gaspe Bay. Found on the European coast south to the Adriatic. 



Lunatia nana (Moller) G. O. Sars, Moll. Eeg. Arct. Norveg., p. 159, pi. 21, tig. 16. 

 Xatica nana Moller, Kroyer's Tidds., vol. iv, p. 80, 1843. 



Three living specimens of this species were dredged on Stellwagen's 

 Bank, north of Cape Cod, in 26 to 32 fathoms, sand, by the XJ. S. Fisli 

 Commission, 1879. It has not previously been recorded from the Amer- 

 ican coast; but it was dredged in 1872 by Messrs. Smith and Harger, in 

 45 fathoms, on Le Have Bank. It is easily distinguished from all oiu- 

 other species of the group by its horny operculum and closed umbilicus. 

 Except in the last character, it resembles L. immaculata. Its color is 

 ivory-white, shining. 



Dendronotus robustus Verrill, Amer. Jonru. Science, vol. 1, p. 405, fig. 1, 1870. 



Bendronotns velifer G. O. Sars, Mollusca Reg. Arcticaj Norvegite, p. 315, tab. 

 28, fig. 2, tab. XV, fig. 4 (dentition), 1878. 



The species well-described and figured in the excellent work of Sars 

 is identical with the American form. Our I), robustus was described 

 from a specimen not fully grown ; but we have since dredged it of larger 

 size, agreeing with 2). velifer, in numerous localities, from oft' Cape Cod 



