40 THE NAUTILUS. 



The shell mounds — the Kitchen middens of prehistoric tribes — are 

 usually overgrown with tropical scrub, and are rich in land shells 

 as well as mosquitoes and sand flies ; and on one of these at Shaw's 

 Point I rediscovered Zonites dallianus which I first found there 

 three years ago, and, at the time, supposed to be the very different 

 Zonites minusculus. In places the brackish water was swarming 

 with Cerithium minimum, and mnscarium, Melampus coffea, Macovin 

 constricta, Natica duplicata and its companion Melongena corona, 

 Lucina Jamaicensis, Cerithidea scalar iformis, Modiola plicatnla, var. 

 semicostata, Mytilus hamatus, and the two Cyrenas, jioridana and 

 carolinensis. The ponds were alive with Physa heterostropta var. 

 pomilia, Succinea luteola, which seems about as completely aquatic 

 as any of the pond snails, Planorhis tumidus, which is a form of the 

 protean and widely distributed trlvolvis; and on the keys several of 

 the Polygyras were abundant. 



Our ten days of collecting came to an end all too soon, for although 

 we had worked very hard and gathered in some 200 species and 

 perhaps 25,000 specimens, Me had not had time to write a half 

 dozen notes, and we had only made a beginning at what we Avanted 

 to accomplish. We packed our material and bid good-by I'eluct- 

 antly to the land of jialmettoes, warm breezes and sparkling Avaters, 

 carrying with us bright, happy memories that will only grow pleas- 

 anter as time passes away. 



ON ATLANTIC CREPIDULAS. 



BY WITHER STONE, PHILADELPHIA, PA. 



During the summer of 1891 while at Cape May, IST. J., I made a 

 considerable collection of Crepidulas of all ages and varieties with 

 a view to studying the relationship of the several species found on 

 the New Jersey coast; and some of the possibilities suggested by an 

 examination of this material may prove of interest. 



We have on this portion of the Atlantic seaboard four nominal 

 species, of which three, C.Jornicaio, convexa and glauca, grow upon 

 the outside or convex surfaces of the shells upon Avhich they occur. 



