I20 Bulletin 39 29^ 



with about 17 on the last v/horl and the canal; aperture suboval, 

 with a heavy but not thickened outer lip, internally lirated. 

 Length 27, diameter 11, last whorl 17, spire 4.5 mm. 



This shell is related to the Phos elegans Guppy of the Mio- 

 cene of Jamaica and Santo Domingo. Our shells differ from 

 t3^pical examples of elegans from Santo Domingo, in being larg- 

 er, and more coarsely sculptured. 



Varix-like thickenings occur scattered along the spire-whorls. 

 The protoconch of typical elegans and limo7ie7isis are practically 

 identical. The recent West Coast Phos 'Veraquensis Hinds is a 

 related but more finely sculptured species. 



Gatun Stage: Port Limon. 



Bocas del Toro. 



Phos estrellensis, n. sp. Plate 9, figures 17, 18 



Shell small, slender, solid; spire much longer than the ap- 

 erture, pointed; whorls of the spire 6 or more, convex in profile 

 with deep sutures; sculpture of narrow, straight ribs which com- 

 mence on the columellar area and pass across the whorl to the up- 

 per suture; there are 12 or 13 ribs on the last whorl which are 

 evenl}^ and widelj^ spaced except on the back of the outer lip 

 where they are smaller and more numerous; the spirals consist 

 of a primary set of threads or cords with a single, smaller second- 

 ary thread in each interspace except on the base and the canal; 

 the primary threads crossing the ribs form small, whitish tuber- 

 cles; the spire-whorls have 4 primary spirals and there are 11 on 

 the last whorl, exclusively of the canal; aperture sub-elliptical, 

 produced anteriorly to form the straight anterior canal; outer lip 

 thickened and internally lirated. 



Height 20, diameter 8, aperture 9 mm. 



A small, slender species, coarsely sculptured like the larger 

 and broader Phos Moorei variety costaricensis. It is limited in 

 our collections to the Gatun beds of the Estrella River. 



Gatnu Stage: Coll. 6, y, Estrella River. 



