350 NOTICES OF BOOKS AND MEMOIRS. 



into two more or less unequal halves, one of which gives origin, by 

 partitions at right angles to the primary one, to a complex of cells 

 enlarging by marginal growth, while the other either is wedge- 

 shaped and divided by walls inclined successively to the left and to 

 the right (Mohria), or else there are formed in its several parallel 

 walls usually at right angles to the primary longitudinal septum 

 {Anemia, and frequently also Mohria). From the lowermost of 

 the two cells formed by the division of the last mentioned half, 

 after some regular segmentation, a peculiarly-shaped marginal cell 

 is formed. This grows forwards parallel to the border of the pro- 

 embryo, and divides from time to time by transverse walls, thus 

 giving origin to a row of cells of which it constitutes the top cell. 

 This, which we shall refer to as the "lateral row," gives origin to 

 the special reproductive tissue [Gea-ehepohter). 



The pro-embryo of Ancimia at this time is reniform with the 

 *' lateral row" on the concave side ; that of Mohria at first broadly 

 spathulate, afterwards roundish. 



Immediately after the completion of the "lateral row" [Mohria), 

 or some time afterwards, [Aneimia) periclinal and the anticlinal 

 divisions appear in it. The cells thus formed divide, in conjunction 

 with the neighbouring superficial cells of the pro-embryo, by means 

 of walls parallel in direction to the plane of the latter, and so form 

 the special reproductive tissue. The marginal cells developed from 

 the "lateral row" form in Aneimia the upper border of that tissue, 

 and these cells, either immediately or after periclinal and anticlinal 

 division, grow out perpendicularly to the margin, dividing by 

 periclinal septa. The upper border in Mohria is, however, present 

 in only a rudimentary condition. 



In both genera the special reproductive tissue is, as a rule, 

 placed laterally with respect to the pro-embryo. On the prothallia 

 of both grow papillae, those of Aneimia on the margin, those of 

 Mohria almost exclusively on the surface. In either case the 

 papillae first appear near the "lateral row." The cover-cell of the 

 anthiridium of Mohria is entirely cast off, that of Aneimia bursts 

 in a steUate manner. From the side of unfertilised prothallia of 

 Ancimia the special reproductive tissue grows out as a shoot of 

 almost uniform breadth, until either fertilisation ensues or the pro- 

 embryo dies. Moreover, adventitious shoots from the special 

 reproductive tissue of older pro -embryos are of almost constant 

 occurrence. S. M. 



Pringsheim's 'Jahrbuch' for 1879 (xii, 1) contains memou'S 

 by F. Hildebrand, ' On the glands of Crudfera: ' (tab. 1) ; by 

 Caspary, * On hereditary knobs and buds in the roots of Brassica 

 Xajjus' ; by J. Moellcr, ' On the anatomy of some medicinal barks ' 

 (Quebracho bianco and Curtidor bark, tab. 2); and by F. K. v. 

 Hohnel, 'On air and sap -movements in plants.' 



