Mr. W. S. MacLeay's Note on the Annelida. 385 



Epipactis americana ; foliis inferioribus ovalibus superiori- 

 bus lanceolatis, bracteis floribus longioribus, racemo laxo 

 sursum pubescente, hypochilio medio muricato, epichilio 

 ovato acumine lato membranaceo. — Mexico; Juxta Rio 

 del Salto cataractas, locis umbrosis, Aprili, Hartweg; 

 Nova Albion, Douglas ; Texas, Drummond. 

 An American Epipactis is a great novelty ; this appears to 



be the only species found as yet on that continent. It ranges 



from the Columbia river as far as Mexico. 



XLVI. — Note on the Annelida. By W. S. MacLeay, M.A., 



F.L.S., &c* 



These animals differ from true Annulosa in being herma- 

 phrodite, and in general red-blooded f. They are soft vermi- 

 form animals of an articulated structure, and which form the 

 immediate connexion between such Vertebrata as Amphioxus 

 and Myxine, and such Annulosa as Porocephalus and other 

 white-blooded Vermes, which have the sexes distinct. 

 I divide the Annelida as follows : 



ANNELIDA. 



Normal Group. 

 POLYPODA. [NEREIDINA. 



Marine animals, 

 having their body << SERPULINA . 

 provided with di- 

 stinct feet. 



Aberrant Group. 



fLUMBRICINA. 



APODA. 



Body without feet ^ 

 or a distinct head. 



NEMERTINA. 



HIRUDINA. 



Animals free, having a distinct 

 head provided with either 

 eyes or antennae or both. 



Animals sedentary, and having 

 no head, provided with eyes 

 or antennas. 



Animals without eyes or an- 

 tennae. Body externally seti- 

 gerous for locomotion. Arti- 

 culation distinct. 



Animals aquatic, without eyes 

 or antennae. Body not ex- 

 ternally setigerous. Articu- 

 lation indistinct. 



Animals provided generally 

 with eyes but not with an- 

 tennae. Body not externally 

 setigerous. Articulation di- 

 stinct. 



* From 'The Silurian System,' by R. I. Murchison, Esq., p. G99. 



f Milne Edwards is said in the public journals to have discovered that 



