Miscellanies. 393 



19. Monograph of the Limniades, and other Fresh Water Uni- 

 valve Shells of North America: by S. S. Haldeman, Philadelphia. 

 Judah Dobson, July, 1840. No. 1. 8vo. 



The specimen number of a series bearing the above title, reached 

 us last January, and was duly acknowledged in the list appended to 

 the 78th number of this Journal, 



The object of the work is to fill the space left unoccupied by the 

 labors of Messrs. Lea and Conrad on the Unionidse, and Mr. Binney 

 on the Helices. The plates are executed in fine style, on copper, 

 drawn by Miss Lawson, and colored very beautifully, with five or six 

 examples of each species. The following species of Paludinae are 

 contained in the first number, — decisa, Say; subcarinata. Say; inte- 

 gra, Say ; ponderosa, Say ; genicula, Conrad. Mr. Haldeman des- 

 cribes five new Mollusca and parasitic animals, viz. Anculosa littori- 

 na, from Holston river, Va. ; Cerithium (Potamis) Californicum, 

 hab. California, Mr. Nuttall ; Cyclas elevata, hab. near N. Orleans ; 

 Hirudo (Clepsina) scabra, found on Planorbis bicarinatus ; Cercaria 

 hyalocauda; parasite of Physa heterostropha. He also proposes to 

 establish a new genus Discus, for the reception of Planorbis armi- 

 gerus, Say ; its characters are the same as Planorbis, with the addi- 

 tion of the teeth situated within the aperture of the shell. Each 

 number will contain five plates and descriptions, and costs $1 per 

 number, and may be had of Mr. Dobson. 



20. Leonhard's Geology. (Geologic des Gens du monde, par K. 

 C. de Leonhard, canseiller intime, professeur a Puniversite de Hei- 

 delberg : traduite de V Allemand sous les yeux de Vauteur, par P. 

 Grirahlot et P. A. Toulonzau. Tome deuxieme, Paris et Stutt- 

 gart, 1840, pp. 484, 8vo.) 



This is the second volume of a series of three, in course of publi- 

 cation, by the celebrated author of the Hand-book of Mineralogy, 

 and Editor of the Jarbuch fur Mineralogie, &c. We have not seen 

 the first volume, and are therefore unable to speak of it in connec- 

 tion with the present ; but the second is evidently a continuation of 

 the first, and not an independent treatise. It commences with an ac- 

 count of the prismatic divisions and vesicles of the volcanic and Plu- 

 tonic rocks, and their action on the other rocks. He then proceeds 

 in the usual order, through the superincumbent strata to the top of 

 the coal. But the work is enriched throughout by every attraction of 

 style and illustration, and the author has brought, to the elucidation 

 of his subject, all the resources of a highly cultivated and accomplish- 

 ed mind. He is by no means confined to the mere technical details of 

 his science, but draws interest from every source. Thus, at the con- 



