Bibliographical Notices. 473 



dried Algae which have appeared under the auspices of eminent al- 

 gologists. It contains twenty-five species, of which in general the 

 specimens are excellent, and some of great interest. M. Areschoug 

 is very desirous of entering into correspondence with British algolo- 

 gists, and would most thankfully receive any communication. The 

 following species are contained in the present fasciculus : — 



1. Fucus serratus, L. 14. Conferva cannabin a, Areschoug. 



2. canaliculars, L. 15. fucicola, Velley. 



3. vesiculosus, L. var. 16. pannosa, Areschoug. 



4. Gigartina plicata, Grev. 17. bombycina, Ag. 



5. Dictyosiphon foeniculaceus, Grev. 18. rupestris, L. 



6. Asperococcus Turneri, Hook. 19. vadorum, Areschoug. 



7. Cladostephus spongiosus, Ag. 20. Mougeotia genuflexa, Ag. 



8. Callithamnion Rothii, Lyng, 21. Mesogloia rubra, Ag. 



9. Polysiphonia bulbosa, Suhr. 22. Corynepbora marina, Ag. 



10. byssoides, Grev. 23. Calothrix fasciculata, Ag. 



11. Enteromorpha intestinalis, Lk. 24. Oscillatoria asstuarii, Lyng. 



12. clatbrata, Lk. 25. Licbina confinis, Ag. 



13. Conferva Linum, Roth. 



De Hydrodictyo utriculato dissert atio Botanica. Dr. John Ehr. 

 Areschoug. Lundse, 1839. 



The present academical treatise throws new light on a very inter- 

 esting subject. It has been long known that a new individual of 

 Hydrodictyon utriculatum is developed from each cell in the form of 

 a minute net produced within the cell. The mode of development, 

 however, as far as we know, has not before been observed. No men- 

 tion of it is made by Meyen, who regrets that when he had abundant 

 specimens at his disposal he had not at hand a sufficiently good mi- 

 croscope. 



According to M. Areschoug, the cells, when nearly at maturity, 

 contain a number of active spherical granules, which in the process of 

 reproduction become elliptical, and are attached by their extremities, 

 where an articulation is soon produced, so as to form pentagons or 

 hexagons. Each granule becomes a cell of the new Hydrodictyon. 

 It is much to be wished that so interesting an observation should be 

 confirmed by others who have an opportunity of examining the 

 plant in every stage of its growth. 



Icones Plantarum Rariorum Horti Regii Botanici Berolinensis. Heraus- 

 gegeben von H. F. Link, Fr. Klotzsch, Fr. Otto. First and Second 

 Parts (each with two sheets of text and six coloured figures). 

 Berlin, 1840. 



The beautiful manner in which this commencement of a new work, 

 with figures of the rarer plants of the Royal Botanical Garden of Ber- 

 lin, is got up, and the admirable drawing and execution of the figures, 

 leaves us only to wish that the sale may be sufficient to enable the 

 undertaking to be long carried on in the same style. The text of 

 the present work is thus arranged : the generic, then the specific cha- 

 racters in Latin being followed by the description, observations on 



