Monthly Microscopie! | PROGRESS OF MICROSCOPICAL SCIENCE, 47 
admit this view. We should have been glad to reproduce the 
“conclusion” part of this memoir, but it is so distinctly offensive that 
it would be out of place in a purely scientific journal, as it also is most 
certainly damaging to the authors’ case. 
The Structure of Chitons.—M. W. Marshall has sent us a reprint 
of a paper of his on this subject which appeared in the ‘ Archives 
Néerlandaises’ (t. 4). The author, besides dealing with the question 
of the homologies of the shell and treating of the opinions of Dr. J. 
E. Gray and M. Middendorff, goes with some minuteness into the 
question of the anatomy of the genus. The tests he describes as 
composed of two parts, covered with an epidermis: the articulament 
and the segment. 'The former is composed of four layers; the deepest 
of these consists of calcareous prisms placed perpendicularly to the axis 
of the animal, and further it presents the several zones having different 
degrees of colour; the second layer is harder and thicker and is com- 
posed simply of very fine granules, it is porcellanous, translucent, and 
of a bluish-white colour; the third layer is, like the first, composed 
of prisms placed at right angles to the axis, viewed in section they 
have the appearance of being finely striated ; the upper layer is of a very 
peculiar nature. The author says that each articulus buccalis is seen to 
consist of ten peculiar triangular bodies whose points converge to form 
the point of the articulus. Each of these triangles in its turn appears 
to be formed of a number of needles, so arranged that they help to give 
the triangular shape to the body, and are themselves constituted like a 
feather of a shaft and minute crystalline barbs, and possibly barbules. 
M. Marshall gives a series of figures depicting these singular structures. 
Microscopical Anatomy of the Liver—Dr. H. D. Schmidt, of New 
Orleans, published in a late number of the ‘New Orleans Journal 
of Medicine’ a very diffuse paper on the structure of the liver, and 
illustrated his views by plates. The author’s views are of importance, 
and his method of injecting the liver is of interest. We hope, 
therefore, in an early number of this Journal to reproduce a con- 
siderable part of his paper. We may mention, however, that the me- 
moir is of great length, and that the author’s conclusions differ from 
those generally accepted in this country. Curiously enough, he sides 
neither with Dr. Beale nor Dr. Handfield Jones; but, differing from 
both, he makes the biliary ducts take their origin in a minute plexus 
of capillaries. He also describes very minutely the lymphatics of the 
liver. 
A New Form of Calamitean Strobilus.—Professor Williamson, of 
Owen’s College, Manchester, sends us the reprint of his paper on this 
subject, lately read before the Literary and Philosophical Society of 
Manchester. We could not, without the aid of the handsome plate 
accompanying the paper, give a just abstract of the author’s descrip- 
tion, but the following is a general outline of the specimen which 
Professor Williamson found in the collection of Mr. Butterworth, of 
High Crompton :—When the specimen came into the possession of Mr. 
Butterworth, it consisted of but three oblate joints or segments of what 
had once been a larger structure. In its general aspect it appears 
