363 



cata, ovato-conica, rubiginosa ; anfr. 3 planiusculis, ultimo 

 magno, ventricoso, sub-angulato ; sutura vix impressa ; apertura 

 ampla, ovata ; labro antice vix dilatato, postice baud sinuato ; 

 columella incolorata vel rufo-tincta. Long. -|; lat. -^^ poll. 

 Inhabits Saline County, Arkansas. 



A small, apparently variable species, without any attractive 

 characters. The angle around the last whorl is more or less 

 marked, or even wanting. Small specimens appear to be much 

 like M. Nickliniana. 



Melania succinulata. T. elongata, acuminata, ovato-cornea, 

 tenui, inornata, flavo-cornea ; anfr. 7-10 convexiusculis, apica- 

 libus ad suturam carinatis, ultimo f long, testae, antice sub- 

 attenuata ; apertura angusta, ovata, contorta, antice sub-dilatata. 

 Long, f ; lat. ^ poll. Inhabits Ohio. 



A smooth, delicate species, much thinner than usual, and 

 when well cleaned nearly as transparent and amber-colored as a 

 Succinea. It may be compared with M. clavaformis. 



Melania robulina. T. solida, ovato-rhomboidea, cornea fas- 

 ciis fuscis cincta ; anfr. 6, series duos nodulorum gerentibus, 

 antica ad suturam immersa ; apertura rhomboidea antice in ros- 

 trum producta, postice callo munita. Long. 1 ; lat. f poll. 

 Inhabits Cumberland River, Tennessee. 



Of the same size as M. armigera, Say, but differs in colora- 

 tion ; the rostrum is much longer, and the posterior series of 

 tubercles much more developed. 



The Secretary presented, in the name of Mr. Charles 

 Girard, observations upon Planarian Worms, with descrip- 

 tions of several new species of Echinoderms. 



Having had lately an opportunity of examining a large num- 

 ber of Vortex Warreiiii, a marine planaria, and of investigating 

 some points of its organization, I have observed a fact to which I 

 would call the attention of the Society. I found within the body 

 living young, larvee, the form of which very much resembled that 

 of the full grown animal, with the single difference that the ante- 

 rior extremity was less obtuse. There were as yet no traces of 

 eye specs. The whole body of these larvae appeared to be com- 



