File:EB1911 Lamellibranchia - ctenidia of Nucula.jpg

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Summary

Description

English: Structure of the ctenidia of Nucula. See legend below.

Date

published 1911

Source

“Lamellibranchia,” Encyclopædia Britannica (11th ed.), v. 16, 1911, p. 116, fig. 10.

Author

After Mitsukuri.

Permission
(Reusing this file)

This image comes from the 13^th edition of the Encyclopædia Britannica or earlier. The copyrights for that book have expired in the United States because the book was first published in the US with the publication occurring before January 1, 1929. As such, this image is in the public domain in the United States.

English: Legend:

A.	Section across the axis of a ctenidium with a pair of plates—flattened and shortened filaments—attached.
i, j, k, g,	Are placed on or near the membrane which attaches the axis of the ctenidium to the side of the body.
a, b,	Free extremities of the plates (filaments).
d,	Mid-line of the inferior border.
e,	Surface of the plate.
t,	Its upper border.
h,	Chitinous lining of the plate.
r,	Dilated blood-space.
u,	Fibrous tract.
o,	Upper blood-vessel of the axis.
n,	Lower blood-vessel of the axis.
s,	Chitinous framework of the axis.
cp,	Canal in the same.
A, B,	Line along which the cross-section C of the plate is taken.
B.	Animal of a male Nucula proxima, Say, as seen when the left valve of the shell and the left half of the mantle-skirt are removed.
a, a,	Anterior adductor muscle.
p.a,	Posterior adductor muscle.
v.m,	Visceral mass.
f,	Foot.
g,	Gill.
l,	Labial Tentacle.
l.a,	Filamentous appendage of the labial tentacle.
lb,	Hood-like appendage of the labial tentacle.
m,	Membrane suspending the gill and attached to the body along the line x, y, z, w.
p,	Posterior end of the gill (ctenidium).
C.	Section across one of the gill-plates (A, B, in A) comparable with fig. 11 C.
i.a,	Outer border.
d.a,	Axial border.
l.f,	Latero-frontal epithelium.
e,	Epithelium of general surface.
r,	Dilated blood-space.
h,	Chitinous lining (compare A).

File history

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	16:26, 8 April 2019		747 × 1,116 (311 KB)	Bob Burkhardt	{{Information \|description ={{en\|1=Structure of the ctenidia of ''Nucula''.}} \|date =published 1911 \|source =“Lamellibranchia,” ''Encyclopædia Britannica'' (11th ed.), v. 16, 1911, p. 116, fig. 10. \|author =After Mitsukuri. \|permission ={{PD-Britannica}} }} Category:Nucula Category:Mollusca anatomy

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