94 THE NAUTILU8. 



Tonmliria carujUcnilata (Say). P"" airly common at 5. 

 Cylichna oryza (Totten). Several specimens at 5. 

 Melampus liiieatus Say. Most common at 2. 

 Alexia myosotis (Drap.) Fairly common at 3. 



On a tramp up and down the western end of Long Beach 

 point, Long island, 1 picked up the following interesting 

 forms, besides forty -eight of the commoner species: 



Yoldia limatula (Say). 1 valve. 



Area p&nderosa Say. 3 valves. 



Astarte castanea (Say). Common. 



Tellina tenella (Verrill). 1 valve. 



Tellina. versicolor De Kay. 2 valves. 



Barnea costata (Linne). 1 valve (fragment). 



CavoUna telem^is (Linne). 1 specimen. 



DESCEIPTION OF A NEW SPECIES AND VARIETY OF PLANOEBIS 

 FSOM POST-GLACIAL DEPOSITS.* 



BY FRiVNK C. B.VKER. 



Planorhis parvus urbane nsis n. var. PI. VII, figs. 4-6. 



Shell differing from parvus by having a round aperture, 

 the last third of the body whorl being depressed below the 

 general level of the spire, deeper sutures, channelled in most 

 individuals, and a deeper umbilical region. The body whorl 

 has not quite as great transverse diameter as in typical parvus. 

 In parvus (pi. 1, figs. 1-3) , the whorls are typicall}^ in the same 

 plane, the aperture is oblong or long ovate and the sutures are 

 impressed but not channelled. The umbilical region is also 

 less impressed and has a "reamed out" appearance. 



Height at aperture, 1.00; greatest diameter, 3.00 mm. 

 Holotype. 



Height at aperture, 1.00; gieatest diameter, 3.00 mm. 



* Contribution from the Museum of Natural History, University of Ulinois, 

 No. 1. 



