1913.] NATURAL SCIENCES OF PHILADELPHIA. 15 



for the two dwarfed races from Sturridge's and Kendal Road, although 

 even at these two localities the whorls may reach six in some cases. 



Variation in size in Lucidella aureola (Fer.). — The forms of 

 this species compared in fig. 3 are from Somerset, Santa Cruz Road 

 and Orange Hill, Montego Bay; and to these has been added a series 

 from the A. N. S. P. old collection labelled simply "Swift Col- 

 lection," and recorded as from "Jamaica" without any definite 

 locality. These divide at once into two groups, of which the Somerset, 



Fig. 3.— -Lucidella aureola. Comparison of the dimensions of the species from 

 four different localities. 



Swift Collection, and Santa Cruz Road lots are larger, the Montego 

 Bay lot is smaller. It will be seen, however, that a single specimen 

 from the Santa Cruz Road series approaches the Montego Bay 

 specimens in size, being of less diameter than any of this Orange 

 Hill (Montego Bay) series. The Swift Collection series are all 

 proportionately higher than those from Somerset, which otherwise 

 they compare well with in size. The Santa Cruz specimens lived 



