What is unique or rare about the VM Zodiac signs?

[ReneZ]

Second attempt of my deleted post.

The problem is: I distinctly remember that I have seen, way in the past, a zodiac illustration with two lobsters. This was at a time when digitised manuscripts were extremely hard to find on the WWW.

Searching in the ML archive, I found this post:

Tue, 14 Apr 1998 01:25:21 -0700 (PDT)
[...]
Dear all,

among the astronomical images which can be found at
the Unesco site I recently mentioned, there is one which
has a Scorpius image with two scorpions, while the
VMs has two lobsters for Cancer.
(You are not allowed to view links. Register or Login to view.)

I asked an expert and he told me that such duplication is not
unusual in Arabic zodiac illustrations. (The Ms from which the
above illustration originates is a Latin translation made in Italy,
of an Arabic work, by one IBN al-HAYTHAM).

Not much, but just a little hint that some Arabic original may
be behind the zodiac section of the VMs.

Cheers, Rene

So, I started to wonder if I misremembered.

The MS in question turns out to be the Vatican MS Urb.Lat.1384, and the two scorpions are on f.19.
You are not allowed to view links. Register or Login to view.

This is not the image of the two lobsters that I remember, so I need to keep on wondering where it was....