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398 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 
some examples grow to even greater size, being 1.25 inches long. In 
our syecimens (See Trans. Conn. Acad., v, pl. 44, fig. 10 a) the rostrum 
is usually longer and narrower than in the specimen figured by Sars, 
approaching in this respect his figure of N. glacialis, but with the 
cartilage-pit as large and broad as in his N. arctica. In fact, the ma- 
jority of our specimens may be described as intermediate between the 
two forms figured by Sars. 
Nezra obesa Lovén (1846) —=N. pellucida Stimpson (1852). 
Associated with the preceding, in most of the localities named, I have 
found another form, often .5 of an inch or more in length, which I con- 
sider identical with Necra obesa of Lovén, and which often agrees well 
with the figures of this species given by G. O. Sars, but with the ros- 
trum more commonly somewhat shorter. The cartilage-pit has the same 
form as the one figured by Sars. The young of this shell is the Newra 
pellucida of Stimpson, without doubt. I have repeatedly dredged it in 
his original locality. 
Neera obesa, as thus determined, is closely allied, in form and struet- 
ure, to N. arctica and var. glacialis. Its texture is thinner, more deli- 
cate, more translucent, and smoother, or with less conspicuous lines of 
growth, and freer from adherent mud. These differences are not merely 
due to age, for I have examined both forms, of various sizes, from .10 of 
an inch or less, in length, up to the full-grown specimens. 
The largest specimens of N. obesa are, however, rarely more than .50 
of an inch in length. The shell is usually very swollen and ventricose, 
rather abruptly contracted posteriorly at the base of the rostrum, which 
is rather narrow and not very long, but varies considerably in length 
and breadth. The cartilage plate is prominent, and projects inward so 
as to form a distinct angle. 
Neera jugosa S. Wood. 
G. O. Sars, op. cit., p. 88, pl. 6, figs. 9 a-e. 
This species is easily distinguished from all others found on our coast 
by its concentric raised lamelle. Station 894, 365 fathoms, off Newport, 
Red.* 
Nezra rostrata (Spengler) Lovén. 
G. O. Sars, op. cit., p. 89, pl. 6, figs. 7 a, b. 
Several fine, large specimens of this species were dredged by us about 
70 to 75 miles south of Martha’s Vineyard, in 85 to 115 fathoms, and 90 
to 100 miles south from Newport, R. I., in 120 to 500 fathoms. It is 
easily distinguished from the forms above mentioned by its very long 
and narrow posterior beak or rostrum, and by the oval form of the shell. 
It has a nearly smooth surface. 
Neera multicostata Verrill & Smith, sp. nov. 
This is a large and very distinct species, easily distinguished from all 
others known on our coast by the strong radiating ribs which cover the 
