10 PROCEEDINGS OF THE ACADEMY OF [Jan., 



of this species or any other, where the wall is their only cover, are 

 always subject to such recurring periods of enforced inactivity^ 

 during dry spells and with the long period of the dry season, which 

 may last for several months, during which the sexual organs prob- 

 ably mature. These wall dwellers become active after every shower, 

 and probably aestivate temporarily during the dry spells between 

 showers, so they have many less growing days throughout the year 

 than forms that may move about and feed any day. Each aesti- 

 vation period is marked by a pronounced gro^vth line, and the 

 30 or more such interruptions mentioned above are thus recorded. 

 If the adult stage is reached by the animal before the shell has passed 

 through the tuberculated-and-keeled periphery stage of shell growth, 

 then the adult, with lip developed, has this tuberculated periphery; 

 if this stage has been passed the last whorl is smooth and not tuber- 

 culated along the periphery. In the Sturridge place forms, where 

 the whorls may reach five and one-half, but few show the tuber- 

 culation of the periphery extending out to the lip. 



Lucidella aureola (Fer.). Plate I, figs. 16-26. 



Helix aureola Ferrusac, Nat. Hist, des Mollusques, Vol. 3, 1820-1851, 



PI. 48, fig. 1 (not. PI. 49A, 1). 

 Helicina {Lucidella) aureola Sow., Thes., Vol. Ill, p. 282, No. 56, figs. 94, 



479. 

 Lucidella aureola Swainson, Chemn. ed. nov., PL 5, figs. 20-23. 



This is the most widely distributed species of Lucidella in the 

 island of Jamaica, but it generally occurs in small numbers at any 

 one station. Specimens of this species were examined that were 

 collected in Portland (Port Antonio), St. Andrews (Stony Hill and 

 Constant Spring), St. Catharine (Natural Bridge, Bog Walk), Man- 

 chester (various points near Mandeville), and St. James (Montego 

 Bay at Orange Hill and Rose Mount) as well as a number of other 

 collections of which the locality was not recorded further than as 

 from "Jamaica." Among these, the race from St. James as found at 

 Orange Hill and Rose Mount is a small, dwarfed form which is differ- 

 ent from any seen elsewhere, and is only matched in size by an occa- 

 sional specimen from the region to the southwest of Mandeville, 

 along the Santa Cruz road. With the exception of this St. James 

 race from the vicinity of Montego Bay, the general description of 

 the species (Plate I, figs. 16-21) is as follows: 



Shell depressed conoidal, spire somewhat convex, apex mucronate; 

 uniformly colored some shade of chestnut, paler in the young shells; 

 the shell sculptured with fine revolving lirse and the whorls crossed 

 by oblique wrinkles which follow the growth lines in direction. 



