278 PROCEEDINGS OF THE ACADEMY OF [Feb., 



rule. Length 6.5 mm., width 2.3 mm. Lower Claiborne Eocene. Moseley'.s 

 Ferry, Burleson Co., Tex aldrichieUa, n. sp. 



Spire evenly, conically acuminate, the body whorls never exceeding four in num- 

 ber; embryo always larger and well developed 9 



9 — Revolving cariniB as in aldrichieUa, very coarse; fasciolar surface with a more 

 or less distinct revolving thread; embryo as wide as high, conical, acutelv 

 pointed, with three smooth and one costulate whorls; shell stout and thick. 

 Length 5 mm., width 2 mm. Lower Claiborne Eocene. Elm Creek, Lee 

 Co., Tex [Glyphostoma] harrisi Aid. 



Revolving carina? very much finer; shell narrower and more slender; embrj'o 

 well developed, higher than wide, acutely conical, with four smooth and 

 one costulate whorls ; fasciolar surface without a revolving thread ; columella 

 with four or more folds as usual in this group. Length of specimen with 

 three body whorls 4.5 mm., width 1.5 mm. Lower Claiborne Eocene. Elm 

 and Vesey creeks, Lee Co., Tex elongatida, n.sp. 



Revolving carinse fine as in elongatula, the shell similarly slender, differing in 

 having two costulate embryonic whorls, a fine revolving thread in the 

 fasciolar surface and but two columellar folds; body whorls but two in 

 number in the type. Length 2.3 mm., width 1 mm. Red Bluff Eocene. 



biplicatula, n. sp. 



A species which is strikingly similar to the Lower Claiborne harrisi 

 was figured by Cossmann (Essais Pal. Comp., deux, liv., PL VI, fig, 35) 

 under the name Scobinella Imvi'plicata Gabb. It is said to have been 

 found at Jackson, Miss., by Meyer, but I have seen no plicate species 

 from that horizon. Cossmann's generic diagnosis of Scobinella is also 

 drawn from this figured "plesiotype," and for this reason does not 

 apply to the Scohinella of Conrad at all. The true Iceviplicata is a 

 Eucheilodon and is perfectly synonymous with reticulata Gabb, The 

 reticulatoides of Harris is, however, a true Scobinella, the name being 

 therefore somewhat unfortunate as Scobinella and Eucheilodon are 

 amply distinct genera. 



Under the description of Pleurotoma infans (Geol. Surv. Ala., Bull. I, 

 p. 75) Meyer refers to a Vicksburg form under the name var. brevis. 

 This form is really not described at all and must be considered a list 

 name, it being simply stated that it is decidedly stouter than infans. 

 Even this statement, however, will not apply to the vicksburgella 

 defined above, which is more slender and elongate than infans and 

 differs radically in the form and sculpture of the embryo, 



Mr, Harris states {Bull. Am. Pal., Vol. 3, p, 24) that the Glyphostoma 

 harrisi of Aldrich is a synonym of infans Meyer. This is incorrect, as 

 subsequently held by j\Ir, Aldrich ; the two species are not at all closely 

 related. 



