File Details
- Depositor
- Karen Dykes
- Date Uploaded
- 2021-12-08
- Date Modified
- 2021-12-08
- Fixity Check
- passed on August 08, 2024 at 14:06
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Height: 1891
Width: 2375
File Format: tiff (Tagged Image File Format)
File Size: 13491864
Filename: pp_050.tif
Last Modified: 2024-08-09T04:14:34.047Z
Original Checksum: 87c402a8dd312e4c721a89f5a1ae056e
Mime Type: image/tiff
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| Transcript |
- July 18 [1958] London
Heard one excellent lecture by
Prof. [Professor] A. Graham. on the function of
the gastropod radula. He defined 4 types
Rhipidoglossa [underlined]: example Gibbula [underlined] (Monodonta also)
complex buccal musculature, mouth
pulls open from sides + a series of 5 or 6 pairs
of muscles Protract a long [drawing of a rod] shaped
buccal cartilage. Over this lies the
subrodula membrane to the ant. [anterior] + upper
edge of which the radula is attached.
The sub radula membrane is held taught [taut]
at the lower end, thus as the cartilage is
pushed out the membrane is pulled across it
+ with it the radula. At the same time
sphincter type muscles hold the buccal
chamber from expanding. This brings
the radula in firm contact with the
substrate. Another important cartilage
is a crescentic jaw cart. [cartilage] in front
in the upper lip, so to speak. This
is operated by a series of muscles that
press it backward against the
buccal cart [cartilage] + then retrace etc. The
result is that with the radula held
firmly against the substrate, the
buccal cart. [cartilage] is moved back + forth
under it. As the rounded end
of this cart [cartilage] passes under the teeth
the side teeth spread wide apart,
+ after its passage they grasp
inward, The action is like grasping
inward with your arms + the
tooth marks are parallel inward
striations. [drawings of radula and teeth]
A series of 15 prs [pairs]
of muscles of very small
size + great innervation seem to act
as proprioceptors + maintain sensitive
contact with the substrate. 33 prs [pairs]
of muscles in all are involved.
spelling?
Taeneoglossa [underlined] [Neotaenioglossa] - Prosobranchs ex [example] Viviparus [underlined]
Entire process very similar
but the muscle equipment is
simplified to 15 pairs with the
tensor proprioceptors lost. The
feeding tracks are much less delicate
but are transverse as in Gibbula [underlined] or
Monodonta [underlined]
Stenogloasa [underlined] - Urosalpinx
Some protraction, but does not
move the buccal cartilage under
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