Miscellanies. 



395 



Gomphonema Americana 

 " lanceolatum 



" nasutum 



" undulatum 



Himantidum gracile 

 Navicula Americana 



" amphigomphus 



" amphioxys 



" Bacterium 



" Baileyii 



" costata 



" decora 



" dilatata 



" gastrum 



" grammatostoma 



" Hitchcockii 



" legumen 



" oblonga 



" porrecta 



" pumilis 



" silicata 



" Sillimanorum 



" tumidula 

 Staurosira construens 



" pinnata 



Tabellaria amphilepta 



" nodosa 



" biceps 



Spongia ramosa 



" serpentina 

 To this list can be added a 

 species. 



Spongia setosa 

 Thylacium ossiculum 



" semiorbiculare 



B. Recent. 

 Achnanthes pactrypus 

 Actinocyclus hexapterus 

 Cocconeis oceanica 

 Dictyocha panduriformis 



" splendens 

 Echinella moniligera 

 Fragillaria catena 



" pinnata 



' Gomphonema subtile 

 Grammatophora Mexicana 

 Navicula Campylodiscus 



" bicarinata 



" crucigera 



". laeta 



" reticulata 

 Podosira moniliformis 

 Spongia capitata 



" clara 



" Neptuni 



" obtusa 



" uncinata 

 Globulus porosus 

 Spirulina vivipar 

 Biloculina tenella 

 Textilaria plicata 



jreat number both of recent and fossil 



J. W. B. 



3. Acarus Crossi ; Experiments of W. H. Weekes, Esq. — We have 

 been favored by the kindness of W. G. Lettsom, Esq., of the British 

 legation at Washington, with an early copy of a paper read by Mr. 

 Weeks, March 15th, 1842, before the London Electrical Society, on 

 the Acarus Crossi. It is now about four years since the scientific world, 

 was excited in an unusual degree by the Voltaic experiments of Mr. 

 Andrew Crosse, in which Acari appeared on and about the apparatus 

 and subject of experiment, during a long continued electrical action. 

 The general belief seems to have been, that in spite of all precautions. 



