NO. 2 PYRAMIDELLID MOLLUSKS — BARTSCH 8l 



deeply channeled and is rendered wavy by the strong summits of the 

 axial ribs. The periphery is deeply channeled. The base is well 

 rounded and marked by five spiral cords which become consecutively 

 weaker from the periphery to the umbilical region. These cords are 

 also very feebly nodulose. Aperture ovate ; columella slender, curved, 

 provided with a fold at its insertion ; parietal wall covered by a thick 

 callus that renders the peristome complete ; outer lip thin, well curved. 



The type, U.S.N. M. No. 561666, comes from the Pliocene of North 

 St. Petersburg, Fla. It has almost five postnuclear whorls and meas- 

 ures: Length 1.6 mm., diameter 0.7 mm. U.S.N.M, No. 561667 

 contains two additional specimens from the same source, and two 

 more are in the collection of the A.N.S.P. 



The more slender outline will readily distinguish this species from 

 Fargoa archeri (below). 



I take pleasure in naming this species for Archie Pogue Cales, the 

 discoverer of the Pliocene deposit of North St. Petersburg, Fla. 



FARGOA ARCHERI, new species 



Plate 16, figure 4 



Shell minute, ovate, cream-yellow. Nuclear whorls deeply, almost 

 completely, obliquely immersed in the first of the postnuclear turns. 

 The postnuclear whorls are moderately rounded and marked by 

 strong axial ribs on all but the first turn where they are weak. Of 

 these ribs, 18 are present upon the second, 22 upon the third, and 25 

 upon the last whorl. These ribs extend strongly from the summit 

 to the periphery and are separated by intercostal spaces about as wide 

 as the ribs. The spiral sculpture consists of four strongly elevated 

 cords, which at their junction with the axial ribs form strong rounded 

 nodules on the first three whorls while on the supraperipheral cord 

 they become very much enfeebled. The spiral cord at the summit 

 and its neighbor are more closely spaced than the other two cords 

 and their combination with the axial ribs produce a dumbbell-like 

 appearance. The fourth cord is bounded on both sides by a very 

 deeply impressed groove which makes this stand out conspicuously. 

 Suture deeply channeled, rendered wavy by the strong summits of 

 the axial ribs. Periphery of the last whorl and base strongly rounded. 

 The base is marked by five spiral cords which become consecutively 

 smaller from the periphery toward the umbilical chink. Aperture 

 broadly ovate ; columella thin, curved, and provided with a fold at its 

 insertion; parietal wall covered with a thick callus that renders the 

 peristome complete ; outer lip thin and strongly curved. 



