40 THE NAUTILUS. 



SOME NOTES ON FLORIDA MOLLUSCA. 



BY FRANK A. WHITE. 



Just before the middle of March I went on a trip to the head- 

 waters of the Halifax river, which is one of the coast-wise waters of 

 Florida. On that trip I had the pleasure of picking up two shells 

 of Argonanta argo var. ameriranu. I found them on the Atlantic 

 Beach about thirty miles north from Mosquito Inlet. 



During the past winter and spring there have been over a hundred 

 of these shells picked up in this vicinity. I never heard of but 

 seven having been found on this beach previous to this season. 



I also found Cyrenoide* floridana Ball. These animals were alive 

 and in apparent health, about one hundred feet from the creek and 

 from J to i inch below the surface of the soil. The laud was low 

 and at the time of finding was wet from a copious rain. I also 

 came across a locality where Physa pomilia Conr. are found, in 

 abundance in running water. 



In January, 1895, I spent sometime at Crescent Beach about 

 twelve miles south of Cape Canaveral. One day I walked south 

 about two or two and a half miles to " the rocks" and found a large 

 live Cyprcea exanthema although it differs very much in contour and 

 spots from the " C. exanthema" in my collection. Thinking per- 

 haps some of the measurements might interest the readers of the 

 NAUTILUS I submit the following : 



Length 113, width 60'. mm.; height when lying with aperture 

 down, 46 mm.; aperture at the widest place 19 mm.; spire not 

 covered, and shows five volutions, dental plications on lip 40 ; plica- 

 tions on columella 34; lip only slightly inflexed having the inner 

 side of lip all visible. 



When found the entire shell was a rich dark brown externally ; 

 purple inside where visible. The outside showed no trace of band, 

 spot, or growth-lines but it has faded much although kept in the 

 dark most of the time, and now shows growth-lines more than half 

 way round, across the back it shows three light bands and near 

 both lips light spots. In the summer of 1881 I found one somewhat 

 smaller of the same rich brown color and in just about the same 

 place. I have never known of any of this species being found alive 

 any farther north than " the rocks." 



