11 



he thinks he has discovered an entirely new footprint of 

 a biped web-footed animal, two and a half inches long, 

 with a stride of about ten inches, and with an impression 

 of a tail. He regards it as much more perfect than the 

 one described by Prof. Hitchcock, and thinks it may even 

 prove that the latter was not made by a web-footed 

 animal. 



This letter was referred to the President. 



Dr. A. A. Gould presented the following descriptions 

 of shells : — 



Helix repercussa. T. sinistrorsa, discoidea, supra plan- 

 ulata, infra concava, plicato-striata et lineis volventibus superne 

 insculpta, castanea ; anfract. utroque 6-|-, ultimo vix angulato, 

 prope aperturam deflecto : apertura despiciens, oblique lunata, 

 peritremate reflexo, postice callo angulato juncto ; lamellis pala- 

 tinis diiabus Intro volventibus, quarum una ad angulum incon- 

 spicuu. 



Diam. 1 ; alt. j^j poll. From Tavoy and Mergui. Rev. J. 

 Benjamin. 



Compared with //. anguina, it is less distorted, more elevated, 

 concave beneath only, whorls more numerous and moi'e closely 

 coiled, obtuse at periphery, not marbled in coloring. 



Helix ramentosa. T. suborbicularis, depressa, tenuis, per- 

 forata, fulva fascia fusca albo marginata ad peripheriam cincta, 

 lineis incrementalibus et sulcis decussantibus pariter obliquis 

 granulata ; anfr. 5^ convexiusculis, ultimo obtuse angulato ; su- 

 tura valdc impressa : apertura oblique oblongo-ovata ; peritre- 

 mate postice acuto, sensim versus umbilicum reflexo, albo; fauce 

 rufescente. 



Axis half an inch ; diameter f inch. California ; from the 

 cabinet of Dr. W. Newcomb. 



Agrees well with H. zonata, Pfr., in which the umbilicus is 

 larger, and no allusion is made to the rasp-like surface. 



Helix damascenus. T. conico-globosa, imperforata, solidula, 

 dilute prunina ad apicem violacea subtus cinerascens, rudis et 



