446 Bibliographical Notices. 



which he believes have hitherto been either imperfectly elucidated 

 or altogether neglected. 



The neck or true body of the worm is thickly studded with oval 

 corpuscles, the average long diameter of which is y^2 n( ^ °f an inch, 

 and the short diameter fjjjgtfht These corpuscles are composed of 

 a shell of carbonate of lime inclosing an internal granular matter. 

 Mr. Gulliver thinks it probable that they are the ova of the worm. 

 They are almost exclusively confined to the body, not one of them 

 being found in the caudal vesicle; but the tissue of the latter is 

 throughout pervaded by oil-like spherules. 



In a description of the configuration and arrangement of the hook- 

 lets, the author shows that the two sets, though alike in form, are 

 quite distinct in size, and arranged alternately ; and that each claw 

 has a blunt lateral process, which has been mistaken for an ovum ; 

 and this process, when seen foreshortened, has the appearance of an 

 oval body distinct from the claw. 



The paper is illustrated by several figures, exhibiting the form and 

 structure of the corpuscles supposed to be the ova, of the tentacles, 

 as well as of body, caudal vesicle and cyst of the Cysticercus, from 

 the omentum of the Mexican deer. 



Genera Plantarum secundum Ordines Naturales disposita, auctore 

 Stephano Endlicher, 1836—1840. 



A work to which reference could be made with almost a certainty 

 of finding the complete characters of any genus of plants has long been 

 a desideratum with botanists, and from the labour, not to say know- 

 ledge, requisite for the production of such a book, many of them have 

 almost despaired of its ever appearing. We feel therefore peculiar 

 pleasure in congratulating botanists in general, and more particu- 

 larly Prof. Endlicher, on the completion of the above gigantic under- 

 taking, the earlier portions of which have been long enough in our 

 hands to give us practical experience of its usefulness. This book 

 is closely printed in very large 8vo, consisting of 1483 pages, and 

 containing nearly 7000 genera, and is so arranged as to form either 

 one or two volumes at the pleasure of its possessor. A collection 

 into one place of the descriptions given by the first observers of the 

 several genera would have constituted a valuable work ; but here we 

 "find the characters of each genus in an order reduced to the same 

 form so as to contrast with each other, and thus point out in a 

 peculiarly satisfactory manner the distinctions of each genus from 

 every other. This is a point far too much neglected by botanists 

 in the description of species as well as genera, and we are therefore 

 rejoiced to find that it has been so carefully attended to in the work 

 before us. 



The author states that it is his intention to publish supplements, 

 containing corrections and additions, as often as a sufficient quan- 

 tity have been collected, and expresses a hope that all botanists will 

 communicate to him such new genera as they may describe, or errors 

 which they detect. We have no doubt that this very reasonable re- 

 quest will be most cheerfully complied with, and that thus we shall 



