JoSSLlKlfSa] PROGRESS OF MICROSCOPICAL SCIENCE. 247 
be out of the question. Suffice it to say, the author deals with the 
whole question of the development of the ovum, and that to the 
reliable results of his own prolonged labours he adds the light 
thrown by all recent research on his subject. The twelve exqui- 
sitely drawn folding plates which are appended to the work are, 
we affirm without hesitation, the most luxurious examples of litho- 
graphy that we have ever seen. There are a softness of touch 
and a naturalness of delineation about them which give them an 
unusual degree of fidelity as representations of microscopic struc- 
ture. 
Die Borstemvilrmer \Annelida CJiGeiopodaj nacJi systematisclien und 
anatomisclien miter suchung en, von Ernst Ehlers, M.D. Erster Band, 
mit xxiv Tafeln. Leipzig : W. Engelmann, 1868. — So much con- 
troversy has taken place within the last few years between MM. 
Quatrefages and Claparede relative to these worms, and so much 
work ^has been of late done in this branch of zoology, that all will 
be glad to have so good a treatise as that of Ehlers which is now 
before us. It seems to us that the author has been liberally just 
to his fellows in the field he cultivates ; and we think, too, that he 
has given a great deal of useful attention not merely to outward 
forms of the worms and their appendages, but to their internal 
anatomy. Frequent reference is made by him to the memoirs of 
the two naturalists we have mentioned, and also to those of John- 
ston, Baird, Malmgren, Mecznikoff, Kinberg, Agassiz, Hensen, 
Hasse, Peters, Siebold, Loven, Engelmann, and others. The 
plates in this the second division of Ehlers' work are twelve in 
number, and are extremely well executed. 
PKOGKESS OF MICEOSCOPICAL SCIENCE. 
On tlie Ciliary Muscle in the Domestic Mammalia. — A valuable paper 
on the anatomy of this organ, by Herr W. Flemming, appears in the last 
part of volume iv. of Max Schultze's ^Arcliiv fiir Mikroshopisclie Ana- 
tomie' He has examined this much-disputed structure in the following 
domestic animals : cats, dogs, pigs, horses, oxen, sheep, rabbits, and 
rats. He finds that in all these animals the real points of attachment 
are to the choroid behind, to the sclerotic and cornea in front, and 
some less certain to the iris. The anterior attachment is certainly not 
an " elastic " one, as Levy takes it to be, but an unyielding one ; for 
the muscular fibres are attached partly to the sclerotic and partly to 
the ligamentum pectinatum, which consists of inelastic connective 
tissue. This attachment must be indisputably regarded as its fixed 
point or origin, so that the muscle fully deserves the name of tensor 
choroidei. Li the cat and the dog the iris is acted on by this muscle 
so as to have its circumference drawn backwards by it. This is 
