Musæum regalis societatis, or, A catalogue and description of the natural and artificial rarities belonging to the Royal Society and preserved at Gresham Colledge made by Nehemiah Grew ; whereunto is subjoyned The comparative anatomy of stomachs and guts by the same author.

A Rabbit.

THe Gulet of a RABBIT is inserted into the middle of the Stomach, as in a Rat.

The Stomach shaped almost like a Dogs, but bigger, with respect to the Animal. Its inner Membrane is gather'd up into several little Plates, like those in a Man. At the End next the Pylorus, much thicker, and more Glandulous, Ner∣vous, and Muscular than in any other part.

The Guts, without the Caecum, are four yards long. In number, five. The First, or Jejunum, about four feet long, and 〈◊〉〈◊〉 an inch over.

The Second, or Ileum, as long; and above ½ an inch over. Whereas in some, as the Polecat, Dog, Urchan, the Second Gut is smaller than the First.

The Jejunum is besprinkled with a great number of very small Glands: which when the Guts are blown up and dry, look like a multitude of little Specks. Whence the Gut is more opacous than the Ileum.

Besides these smaller Glands, the Jejunum and Ileum to∣gether, are furnished with four or five Clusters, about as broad as a Two-penys; and every Gland as big as Wallflower-Seeds.

Where the Ileum enters the Colon, it hath a very thick white and Glandulous Body, or Pancreas Intestinale: and the mouth of each Gland very apparent.

The Caecum, of a prodigious size; above ½ a yard long, and and an inch and ½ over where widest.

At the End of the Caecum hangs a certain Label, also con∣tinuously hollow with the Caecum, and may be accounted part of it. Betwixt three and four inches long; and at the upper end, ••/4 of an inch over; in shape like a Man's Finger. Lined quite through with a thick Glandulous Body, like that in the end of the Ileum.

All the rest of the Caecum very thin, and transparent: so as being blown up, it looks like those Skins of Iceing-Glass, formerly us'd for Transparent Flower-Works.

This Gut seemeth at first, to have many Valvulae Conni∣ventes. But by being blown up, is fairly represented one single Valve or Plate, stretched out perpendicularly from the circuit of the Gut, and most curiously winding, in a spiral Line, from one End to the other.

This Gut runs into the Colon, which is above a foot long, where widest or next the Caecum, an inch over; at the other end ½ an inch. It hath a double Vinculum, one on each side; by which 'tis gather'd up into a great number of little Cells, contiguous one to another throughout.

In opening this Animal, being just dead, the Peristaltick motion of the Guts, was very apparent, especially in this Gut. By means whereof, the several Cells aforesaid, were made reciprocally to move in and out; so as while one moved and was convex inward, another next adjacent, mo∣ved and was convex outward; and so on by a kind of un∣dulation, for several inches together.

This Gut is very thick and Glandulous all over, the Glands standing every where close and contiguous: so that the in∣side of the Gut, looks like the Seal-Fishes Skin. The Glands are not flat, as in the Guts above describ'd, but standing up round and high, like an infinite number of Papillae: the Mouths of each visibly open; from whence a Muçus may easily be express'd.

So that all Intestinal Glands are either Flat, or Spherical; both with a Mouth in the centre. Answering to a Button-Mould; the Flat Gland, to a flat Mould; and the Sphaerical Gland to the like Mould. The former may be called Rotu∣lares: the latter Papillares.

The Last Gut is about four feet long; as wide as the Ileum, and near the Anus wider by ¼ of an inch.

This Animal hath none of those Bags observed at the Anus of the Carnivorous kind.