138 Bibliographical Notices. 



maggot had never commenced, so that, at least up to the present 

 time, I have observed none of the species of this group to be vivipa- 

 rous. It is curious how the seminal fluid and the Spermatozoa con- 

 tained in it can arrive in the seminal capsules, situated so far from 

 the vulva; in the first group of the Tachina, ciliatoiy motion cannot 

 advance the semina from the anterior commencement of the sheath to 

 its very end, since the sheath and the other female generative organs 

 do not possess any, and indeed I have liitherto not discovered any 

 ciliatory organs in true insects." 



8. On the genus Scarabus, Montf., by F. H. Troschel. 



9. On some native (German) land snails, by Dr. Aug. Muller. 

 The author notices the occurrence of Helix Scarburgensis near Kiel, 

 on the coast of the Baltic, and points out the impropriety of giving 

 names of places to new species. The other species mentioned are 

 Vertigo plicata and V. pusilla. 



On vegetable Spermatozoa, by J. Meyen. The author directs the 

 attention to the existence of the long-tailed Spermatozoa in the an- 

 thers oi Marchantia polymorpha. 



The first part of a paper on the Motions of Plants (a prize me- 

 moir), by M. Dassen ; this we shall notice with the third part. And 

 a translation of Mr. Owen's paper on Gnathostoma finishes the pre- 

 sent number. 



Works in the Press. 



Natural History and Illustrations of the Scottish Salmonidse. By Sir 



William Jardine, Bart. 



It is proposed, under the above title, to publish a series of plates 

 illustrating the diflferent species of the Scottish fishes, which com- 

 pose this family, accompanied with a volume of descriptive letter- 

 press. 



The plates will amount to from twenty-five to thirty in number, 

 elephant folio, so as to admit of the greater part being represented 

 of the size of life. On these will be figured all the species of migra- 

 tory salmon and of trout, with its varieties, which inhabit or frequent 

 the rivers and lochs of Scotland, together with the char, coregoni, 

 &c. The very dissimilar appearance which this grpup of fishes as- 

 sumes at different ages and at different seasons, has rendered their 

 history extremely difficult to investigate, and has in many instances 

 caused a nominal multiplication of species by several being described 

 in states apparently very different, while the variation was occasioned 

 by the same influence which acts at similar periods on the plumage 

 of birds, and to which may be attributed the great confusion so long 



