128 PKOaRESS OF MICROSCOPICAL SCIENCE. rlTrise? 
Vienna Academy (LVII. Band Y. Heft), states that he has found 
evidence of the presence of un striated muscular fibre in the ovary. 
The Structure of the Prostate Gland has been well investigated by Herr 
Teleky. In his published paper (Sitzungsber. d. K. Acad. d. Wissen, 
VII. Heft) he states that the ejaculatory ducts traverse the Prostate, 
and are surrounded on all sides with glands to the number of about 
60 or 100. The largest of them is placed above and beside the centre 
of the lobes of the Prostate, and the shortest are situate externally below 
and behind. The structure of these glands differs essentially from 
the uniform type of gland. On transverse section of them is seen a 
row of papillae covered with cylindrical epithelium, and the cells of 
this epithelium seem to penetrate into the connective tissue by means 
of filiform processes. Folds, or papillaform protuberances of the 
mucous membrane contribute to form a number of glandular pouches, 
and thus increase the secreting surface extensively. Each gland is 
surrounded by a capillary vessel, which sends branches to each of the 
papillse. 
The Muscular Structure of the Heart-valves. — Herr Gussenbauer, 
who has lately written a memoir on this subject, states that he has 
been able to confirm the results of Kurschner and others to the effect 
that the auriculo-ventricular valves contain muscular fibres. The 
presence of these fibres is, he says, by no means confined to the heart- 
valves of animals. 
The Nervous System of Nemertes. — ' The American Naturalist ' for 
January contains, among other accounts of recent Scandinavian labours, 
by Dr. C. F. Liitken, a brief note on the recent researches of M. Boeck 
on the above subject. M. Boeck is the son of the professor of the 
same name in Christiania. He points out various errors committed by 
previous investigators, and demonstrates that the cerebral mass (or 
brain) is composed of an outer reddish granular substance and an 
inner yellowish filamentose one. 
Tlie Dermal Teeth of the Chondropterygii is the subject of an 
important memoir by Professor Hannover. The author has established 
— in reference to the microscopical structure and the development of 
these scales — four types of placoid dermal teeth, according to the form 
of the cells. These he styles respectively (1) conical, (2) knoll-like, 
(3) net-shaped, (4) bundle-shaped. In dealing with the dental structure 
of the dermal plates of Ostracion, a detailed description is given " of 
some very curious enigmatical comb-like corneous bodies preserved in 
the museums of Copenhagen, Christiania, and Kiel, but of unknown 
origin ; from their resemblance in microscopical structure to the 
dermal spines of skates," the author is disposed to refer them to this 
group. — Oversigt over det Kongelige danshe vidensJcahener Selslcahs For- 
handlinger, 1866 d 1867. 
Formation of the Spores of Varicillaria. — ' The Annals of Natural 
History ' for December contain a translation of a short paper by Dr. 
Nylander on this subject. This paper should be referred to by those 
interested in the point it deals with. The author in part confirms the 
