56 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 66 



TurriteUa planigyrata Guppy, Geol. Soc. Lontlon, Quart. Jourii., vol. 32, p. 519, 



1876. 

 TurriteUa planigyrata Guppy, Agr. Soc. Trinidad and Tobago, (Society Paper 



No. 444), vol. 10, p. 451, 1910. 

 Not TurriteUa planigyrata Guppy, Maury, Bull. Amer. Paleont, vol. 5, p. 29.3, 



pi. 48 fig. 14, 1917. 

 TurriteUa planigyrata Maury, Bull. Amer. Paleont., vol. 10, no. 42, p. 232, pi. 



42, figs. 6, 7, 8, 1925. 



'" Conic cylindric, striate by fine spiral lines, whorls very slightly 

 convex, the later ones nearly flat; aperture subquadrate. Caroni 

 series, Savanetta. A very distinct species, remarkable for its almost 

 entire want of ornamentation, and the flatness of its whorls. I have 

 lately received another specimen of TurriteUa from Mr. LeRoy, 

 which is more like 7\ i??ihrieafa^'' (Guppy 1867), 



There are in the United States National Museum four specimens 

 (U. S. Nat. Mus. Cat. No. 115626), Montserrat (Guppy), and one 

 specimen (U. S. Nat. Mus. Cat. No. 115452), Caroni series, Savanetta 

 (Guppy), designated as types. All of these bear the same specific 

 characterization. In addition, there are five specimens in the collec- 

 tion from Springvale (station 9195), one of which represents the 

 lower whorls of a specimen larger than any forms in Guppy's types. 



None of the specimens possess the earliest whorls. The earliest 

 whorls on the specimens at hand are slightly convex at the 

 equator, gradually sloping to the upper and lower suture. In 

 ascending the spire the whorls gradually flatten out and gently 

 ascend from the upper part of the whorl to the base. It is 

 quite probable that the very earliest whorls are medially cari- 

 nate. The spiral sculpture is very unique, consisting of very narrow, 

 flat-toj)ped bands promiscuously alternating either with narrower 

 bands or fine spiral lines. On the earlier whorls, these spirals are 

 very close-set, separated by spiral striae but on the later whorls 

 these intervals widen. On the earlier whorls, the sutural area is 

 broadly concave, interrupted only by the small presutural spiral, 

 but on the lower and adult whorls the preceding whorl weakly over- 

 hangs the lower suture. The base of the whorl is similarly sculp- 

 tured, except for a narrow, roundly excavated furrow situated a 

 little below the angled shoulder. 



Dimensions: Larger specimen of Guppy's types (U. S. Nat. Mus. 

 Cat. No. 115626) measures: Length — tip broken oft' — 41 mm.; diam- 

 eter 15 mm. The diameter of a larger specimen from station 9195 

 (U. S. Nat. Cat. No. 352679) measures 23 mm. 



This species is very closely related to T. cartagenensis Pilsbry and 

 Brown from the Republic of Colombia, South America, but the latter 

 species has a slight concavity in the upper half of the larger whorls, 

 and the spiral sculpture is a little more open than in Guppy's species. 



