56 



Bulletin 39 



238 



the inner lip; outer lip thin, with a shallow anal sinus, lying in 

 the sutural fasciole. 



Length 54, diameter 20, last whorl 38 mm. 



This elegant species ma}- be compared with the T. jaquensis 

 Sowerb}' from the Santo Dominican Miocene and the recent T. 

 lavinia Dall from the West Coast of Mexico. The Dominican 

 species lacks the sutural cord, as well as differing in details of its 

 sculpture. T. lavinia^ appears to be more closel}" related, differ- 

 ing in its finer sculpture and proportions. 



Gatun Stage: Hill la, Banana River. 



Turricula lavinoides var. [imonensis, n. var. Plate 4, figure 12 



Shell of medium size and with about 10 whorls; nuclear 

 whorls about 2 in number, at first smooth, becoming finelj^ rib- 

 bed on the last half; post-nuclear whorls spirally and axially 

 sculptured; anal fasciole concave, smooth, with a strong spiral 

 cord, just in front of the appressed suture; axial sculpture of 

 about 8 sharp or pointed ribs on the periphery of each whorl, 

 lacking entirely from the anal fasciole and from the base of the 

 last whorl; spiral sculpture of 3 cords on the early spire-whorls 

 becoming more numerous on the later, due to the intercalation 

 of additional spirals; on the last whorl, the spirals number about 

 22, including those on the canal; anterior canal long and straight; 

 anal sinus shallow; outer lip thin. 



Length 47, diameter 18, last whorl, 32 mm. 

 67 27 47 



This shell when full-grown appears distinct from the lavi- 

 noides but young specimens cannot be easily separated. This 

 variety differs from the t3^pical form, by its sharp, narrow, and 

 widel}- spaced axial ribs, which produce a sharp, angled and 

 not rounded shoulder to the periphery of each whorl. The anal 

 fasciole is also wider and more smooth. 



Gat.un Stage: Toro Cays. Port Liman^ coralline limestones. 



