ZOOLOGY AND EOT AN Y, MICROSCOPY, ETC. 101 



grows in the tissue of the leaf, is wavy, thin, and hyaline, and the 

 pyonids are ovoid and nearly entirely buried in the palisade-tissue of 

 the leaf. The cells of the envelope of the pyenid are small, irregular, 

 and with a rather thick membrane ; the innermost layer gives rise to the 

 spores. 



Rabenhorst's Cryptogamic Flora of Germany (Fungi). — The two 



last-published parts (29 and 30) of this work are still devoted to the 

 Discomycetes. The first sub-order is completed by the families Pseudo- 

 phacidiese (Pseudophacidium, Coccophacidium, PseudograpMs, Clithris, 

 Cryptomyces, and Dothiora). The second sub-order, or Stictidege, is made 

 up of the following families : — Eustictese (TrocMla, Ocellaria, Neevia, 

 Xylographa, Briardia, Stegia, Propolis, Phragmonsevia, Cryptodiscus, 

 Propolidium, Xylogramma, Mellitiosporium, Nsemacyclus, l^Stictis, and 

 ScMzoxylori) ; Ostropeee (Laquearia, Ostropa, and Itohergea), The third 

 sub-order or Tryblidiese commences with the families Tryblidiacese 

 (Tryhlidiopsis and Tryhlidium), and Heterosphaeriese (HeterospTiseria^ 

 Odontotrema, and Scleroderris). 



Protophyta. 

 a. Schizopliyceee. 



' Dieranochsete a new genus of Protococcacese.* — Under the name 

 Dicranochsete reniformis, Herr G. Hieronymus describes a new genus and 

 species of Protococcaceas, growing as an epiphyte on Mosses and Hepaticae, 

 and on decaying grass-leaves. It is hemispherical or reniform, with the 

 indentation facing the substratum ; at the base of this indentation is a fine 

 hyaline dichotomously branched bristle, composed, like the cell-wall, of 

 gelatin. In the summer swarm-spores are formed by continued bi- 

 partition of the protoplasmic cell-contents and of its nucleus. They 

 are naked, and have apparently four cilia and a red pigment-spot. They 

 germinate directly without conjugation. 



The author claims also to have established that CMamydomyxa 

 lahyrinthoides belongs to the same cycle of development as Protococcus 

 macrococcus, P. aureus, Urococcus insignis, and Peridinium cinctum. 



Structure of Diatom- valves.f — Mr. J. Deby has made a minute 

 examination of the structure of diatom-valves, by imbedding in a 

 mixture of zinc chloride and zinc oxide, or of magnesium chloride with 

 magnesia, and then making excessively fine sections of the dried mass. 

 His conclusion is that the valve consists of several layers, but is not 

 everywhere perforated in the fashion of a sieve, the result differing 

 therefore from that of Van Ermengem, and from Prinz's observations, in 

 which the membranes which close the pores had completely dis- 

 appeared. 



New Species of Navicula. — Mr. F. Kitton describes the following 

 new species : — Navicula venustissima. Valve elliptical, apices more or 

 less produced, marginal striae close, slightly radiant, moniliform, space 

 between the stride and median line irregularly punctate, puncta some- 

 times confluent, length 0-008 in. to O'Ol in. In dredgings from 

 Samarang, Java, and Aberdeen Bay, Hong Kong, made by Mr. A. 

 Durrand. The dredgings in which the above species was found also 



* JB. Schles. Gesell. Vaterl. Cultur, 1887, pp. 293-7. See Bot. Centralbl., xxxv. 

 (1888) p. 321. t Jouru. Quekett Micr. Club, ii. (1888) pp. 308-16. 



