34 THE NAUTILUS. 



A NEW COLOMBIAN PLEURODONTE. 



BY H. A. PILSBRY. 



Pleurodonte (Labyrinthus) Clappi, n. sp. PI. II. figs. 3, 4. 



Shell imperforate, thick lens-shaped, carinated at the periphery, 

 strong and solid, chocolate-brown, with a purplish cast; surface 

 slightly striated obliquely, and showing a minute and dense but super- 

 ficial spiral wrinkling or malleation over part of the base. Spire 

 dome-shaped rather than conic ; whorls 4| to 5, but slightly convex, 

 slowly widening, the first 2^ whorls punctate, the last angular at the 

 periphery, the angle almost obsolete on the more swollen latter part 

 of the whorl, which is very deeply deflexed in front, and strongly 

 constricted behind the lip, the constriction showing two pits behind 

 the basal lip and a linear scar at the periphery. Aperture extremely 

 oblique, ear shaped, the peristome continuous, the lip broadly re- 

 flexed ; parietal wall bearing a strong and long oblique lamina; 

 outer lip with a compressed, fold-like tooth rising from a swollen 

 base ; basal lip three-toothed, the outer tooth high, oblique and com- 

 pressed, the median stout and squarish, the inner smaller and bilobed ; 

 a small compressed fold stands on the axial reflection, exactly over 

 the umbilicus. 



Alt. 21, greater diam. 35, lesser 30 mm. 



Alt. 19, greater diam. 32^, lesser 28 mm. 



Sierra de Santa Marta, Colombia, at "Alto de Cielo," at about 

 5,000 feet elevation, in forest among rotting leaves on the ground. 



The first specimen taken was a dead shell, eroded and showing a 

 dull red inner layer on the spire, eaten into many small pits on the 

 body-whorl. A second perfect specimen, slightly larger, has been 

 found this year. It is most nearly allied to Helix sieversi v. Martens 

 (Conch. Mittheil. iii, p. 7, 1889; Man. Conch, viii, p. 2G3, ix, pi. 

 22, f. 7, 8), also from the Santa Marta mountains, resembling it in 

 the arrangement of the teeth, but P. Clappi differs from that species 

 in being much larger, with the periphery keeled, the spire lower and 

 dome-shaped, the teeth more strongly developed, and the umbilicus 

 wholly closed. Pleurodonte sieversi measures 12^ by 19^ mm., has 5 

 whorls, a wide-conoidal spire, rounded periphery and minute umbil- 

 ical chink, and there are some differences in the teeth, the inner 



