﻿PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 373 



ture noue, except indistiuct lines of growth ; surface smooth and shiu- 

 iug" throughout. 



Leugth of the auimal iu life about 15'"™ to 20""" ; leugth of shell, 12.5™"'; 

 breadth, 10""". 



Stations 870 to 872, south of Martha's Vineyard, in 80 to 155 fathoms, 

 fine sand (10 specimens, living). 



The shell of this species, in form, closely resembles that of the Eu- 

 ropeau L. perspicua (not of Gould), but the differences in the mantle and 

 dentition will clearly separate it. Specimens of both sexes occurred, and 

 they had the same form and color externally. 



The '■'■ LameJlarla perspicua'''' of Gould was based, in part at least, upon 

 Marsenina (jlahra. A species of LameUaria occurs at Eastport, Me., 

 wliich may be distinct from the preceding. 



Marsenina prodita (Loven) Beigh. 



G. O. Sars, Moll. Reg, Arct. Norv., p. 151, pi. r2, iigs. 5 a-c; pi. v, figs. 7 a, h 

 (dentition). — Verrill, Trans. Conn. Acad., v, pi. 42, figs. 2, '2 a. 



This species was taken, living, at Eastport, Me., by Prof. S. I. Smith 

 and myself, in 1804 and 1808. It is easily recognized by its comi3ara- 

 tively prominent, acute spire, turned to one side, by its obliquely elon- 

 gated aperture, and hy the margin of the outer lip being slightly inflexed 

 near the suture. It has not been previously recorded from the American 

 coast, south of Greenland. 



Marsenina glabra Verrill. 



Oxinoii glabra Contbouy, Boston Joiirn. Nat. Hist., ii, p. 90, pi. 3, fig. 16, 1838. 

 LameUaria persineua (pars) Gould, Binney's ed., p. 337, fig. 607 (?). 

 Marsenina micrompliala Bergli. — G. O. Sars, op. cit., p. 151, i)l. 21, figs. 10 a-d. — 

 Verrill, Trans. Conn. Acad., v, pi. 42, tigs. 1, \a. 



This species is not uncommon at Eastport, Me., where I collected it in 

 1859, 1801, 1803, 1801, 1808, 1870, and 1872. It was dredged last year 

 by our party, on the " Speedwell", off Cape Cod, in 31 fathoms. It has a 

 much smaller and less prominent spire than the preceding, and a more 

 regularly oblong-oval aperture. The shell is smooth, white, thin, and 

 delicate in both species, but more translucent in the present one. 



There can be no doubt, from the description and figure, that the Oxino'e 

 glabra of Couthouy was a ALarsenina indistinguishable from this species, 

 which is the commonest of the group on our coast. The M. microm- 

 pliala, well described and figured by Sars, appears to agree perfectly 

 with our form, both iu the animal and shell. 



Gould appears to have confounded two or more species under his L. 

 perspicua. His figure (158) in the first edition does not represent this 

 species ; the figure 007 of Binney's edition is different, and may be this 

 shell. As a genuine LameUaria^ having its shell entirely inclosed in the 

 mantle, also occurs on our coast, not rarely at Eastport, Me., it is not 

 improbable that Gould may have had its shell among those examined 

 \)j him. Its identity with L. perspicua of Europe is very doubtful, 

 however. 



