1 3 6 M O L L U S C O U S A N IM A L S .
N a t i c a c l a u s a , t. 3 4 . / . 3 . & t. 3 7 . / . 6 . Brod. & Sow. Zool. Jour. i v . 3 7 2 .
In h ab . North Sea, where the shell was discovered by Capt. E . Sabine.
N a t i c a B o r e a l i s , t. 3 7 . / . 2 .
Shell ovate, subglobose, umbilicated, th in , white, smooth, pellucid ; spire conical, ha lf as long as t e
mouth ; whorls rounded | suture deep. Mouth semicircular ; inne r lip rather thickened, slightly reflexed over
the perforation of the axis. Axis S.
In h ah . North Sea. Capt. Edw. Sabine. . , ^ ^
N a tic a globosa o f C apt. King, Zool. Jo u r. v. 344, is very nearly allied to this species, b u t the spire
shorter and the moulh larger, an d th e umbilicus smaller.
N a t ic a s u t u r a l i s . i . 3 7 . / . 4 .
Shell ovate, subglobose, thin, subimperforated, pa le brown, slightly spirally s tria te d ; spire co n ie a l;
whorls rounded, with a deep angular c aual a t the suture . Mouth ovate, elongate, ra th e i extended in f ro n t,
inner lip white, slightly reflexed over the slight perforation o f the axis. Axis I i inch.
In h ab . North Sea. Capi. Sabine and Capt. Beechey.
N a t i c a p a l l i d a , t. 3 4 . / . 15.—Brod. & Sow. Zool. Jour. iv . 3 7 2 .
Inhab. Ic y Cape. • i. i • j
The back dark, and th e apex often eroded like many shells from high latitudes.
N a t i c a s o r d i d a , v a r . g l o b o s a , t. 3 7 . / . 5.— Swain. Zool. III. t. 7 9 .
This species differ, greatly in shape i tbe most elongated variety is figured un d e r the name of
IV. p u u i o l Wood. C a t. S u p . r. S. / . 2 ; the commou state is figured m Swaiuson's Z » » ' ' ' J » ’
the name o t IV. sordida. I have here figured another variety which differs ^
globular ; it may prove d istinct, b u t as I bave only seen a single specimen, I am g P
N . m elastoma. Swain, t. 72. m ay be also a variety of it.
N a t i c a m a m i l l a .
The operculum is homy.
N a t i c a s e m i s u l c a t a .
Shell ovate, suborhieular, solid, pellucid, white, sm o o th ; spire short, convex, rather
convex, w ith s ix ’ot seven narrow regula r compressed lines near the suture, aud few « » - i '
suture compressed; umbilicus simple, rather large aud deep. Moulh very oblique. Axi, 6 , diam.
6 lines.
N a t i c a D E P R E S SA , i . 3 6 . / . 2 .
Shell subhemispherioal, depressed, while, smooth, peUuoid; f
enlarging, la st w ith five spiral bands of small, square chesnut spots, closely con ^ x i s L in c h .
umbilicus very large, e xpanded, with a very broad anterior rib, and deep posterior c y-
Inhab.
N a t i c a o t i s . t. 3 4 . / . 1 3 . t. 37. f . 3 .-B r o d . & Sow. Zool. Jour. iv . 3 7 3 .
TH s species has a notch in th e inner lip like IV. Olauciru. and IV. o e n i.., an dmost of the spec.es which
have h orny opercula.