Prof. H. Mohl on the Structure of Dotted Vessels. 393 



longitudinalis piscis 16 uncias, perpendicularis 5^, transversalis 1|. 

 Radii:— Br. 6; D. 12|10 ; A. 3|9 ; C. 17; P. 14"; V. l\5."— Pisces 

 Austr., p. 26. 



Parkinson's sketch represents the ground colour of the 

 body as aurora-red, with an oblong- vertical spot of a deeper 

 tint on each scale. The Scitena aurata of G. Forster, pi. 208, 

 taken in Queen Charlotte's Sound on the 18th of October 

 1774, may be the same species, though the fin-rays do not ex- 

 actly correspond, being, as near as they can be made out from 

 the figure, D. 12|12, A. 3|6 ; nor are the scales of the opercular 

 pieces shown. Forster ascertained the native name of this 

 fish to be " ghooparee." 



[To be continued.] 



XLIII. — Some Remarks on the Structure of Dotted Vessels^. 

 By Professor Hugo Mohl. Translated from 'Linnaea,' 

 vol. xvi. p. 1, 1842, hj the Rev. M. J. Berkeley, M.A., 

 F.L.S. 



[Witli tv,-o Plates.] 



Notwithstanding the numerous observations wliich have 

 been published on the structure of dotted vessels, the more 

 recent treatises on the anatomy of plants show that no gene- 

 rally received notions prevail at present on the subject. It 

 may not therefore be superfluous if in the following pages I 

 submit to a more complete investigation some points in their 

 structure to which my attention was turned last year when 

 preparing a dissertation on the subject. 



That the difference between my views and those of other 

 phytotomists may be more easily seen, I shall briefly bring 

 together the notions which have been more recently expressed 

 on the subject. 



Although many of the earlier observ'ers, especially Leeu- 

 wenhoek, Kill, Van Marum, and Hedwig,were acquainted with 

 the dotted vessels, they were first expressly distinguished 

 from the spiral and scalary vessels by Mirbel. He consi- 

 dered their dots as elevations which projected on the exterior 

 of the vessels, and were perforated by a real aperture. He 

 was not acquainted with the articulations of these vessels, 

 and he altogether denied the transition of different forms of 

 vessels into one another. As he distinguished the border 

 from the dot, and was acquainted with the uniform membrane 

 extending between the dots, although his observations in 

 many respects were not correct, he nevertheless laid a founda- 



* Getiipfelten Gefasse (glandular fibre ;ind in part dotted ducts, 'Lindi. 

 Introd.' 1832.) 



Ann. i^ Mag. N. Hist. Vol. ix. 2 D 



