PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 197 



as loug as the oral. Its orifice is smrouuded by six lobes and ocelli, 

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

 wrinkled, nearly glabrous, translucent, didl 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, 17'""'; length of oral tube, ll*"!"; of anal, 4'"™ to 5"'"'. 



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



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

 BuUt'tiu National Musetim, No. 1.5, p. 147, 1879. 



This name was proposed for the restricted genus Cynthia of Saviguy, 

 characterized by having both apertures quadrangular, and ovaries de- 

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

 coast are as follows : 



Halocynthia 2)yr if or mis (Eathke) = Cynthia pyriformis authors. 



Halocynthia rustica (Linne) = Ascidia monoceros MoUer. 



Halocynthia tuberculum (Fabr.) = Cynthia, carnea (Ag.) Verrill. 



Halocynthia pulchella Verrill = Cynthia pulchella Verrill. 



Halocynthia echinata (Linne) = Cynthia echinata authors. 



Halocynthia partita (Stimp.) = Cynthia partita Stimpson. 



MOLLUSCA. 

 Xylophaga dorsalis (Turton). 



Many li\aug specimens of this species have been found in bits of old 

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

 off' 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. 



Lunatda nana (Miiller) G. O. Sars, MoU. Reg. Arct. Norveg., p. 1.59, pi. 21, lig. 16. 

 Natica nana Miiller, Kroycr's Tidds., vol. iv, p. 80, 184o. 



Three living specimens of this species were dredged on Stell wagon's 

 Bank, north of Caije Cod, in 26 to 32 fathoms, sand, by the U. S. Fish 

 Commission, 1870. It has not previously been recorded from the Amer- 

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

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

 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. 40.5, fig. 1, 1870. 



JJendronotus velifer G. 0. Sars, Mollusca Reg. Arctics Norvegia?, p. ol5, tab. 

 28, tig. 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 D. robustus was described 

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

 size, agreeing with D. velifer, in numerous localities, from off" Cape Cod 



