INSTITUTE OF SCIENCE, PHILADELPHIA. 83 



The specimen figured comes from the Ripley sands at the summit of the 

 Cretaceous formation in Tippah Co., Mississippi. 



This is an extremely elegant shell, notable for its brilliant surface. I feel 

 little doubt that it is identical with Tuomey's imperfectly described and un- 

 figured species of 1855. In the figure the spiral lines of the early whorls and 

 on the pillar are less prominent than they are on the shell, being perfectly 

 visible through the glaze on the specimen, but too much covered to affect the 

 sculpture of the surface. I am indebted for specimens for study and figuring 

 to Dr. C. A. White, in charge of the Division of Mesozoic Paleontology of the 

 U. S. Geological Survey. 



Liopeplum subjugosum Dall. 

 Plate 6, figure 12 a. 

 ? J/o/u/a jiio-osa Tuomey, Proc. Acad. Nat. Sci. Phila. vii. p. 169, 1S55 ; not of Sowerby. 

 Valuta subjiigosa Gabb, Proc. Acad. Nat. Sci. Phila. for iS6i, p. 149. Cretaceous of 



Alabama. 



Shell thick, brilliantly glazed with five (or more) whorls ; nucleus small, 

 whorls turrited; spiral sculpture of a few weak threads on the foremost part 

 of the shell on and near the siphonal fasciole and mostly buried in callus ; 

 transverse sculpture of (on the last whorl) fourteen or fifteen rounded, thick, 

 strong waves, beginning at the shoulder, which they coronate, and extending 

 about one-third of the way forward with equal or narrower interspaces ; these 

 ribs or waves cease quite suddenly, and on the preceding whorls their anterior 

 terminations are covered by a spiral elevated ridge of callus, which over- 

 shadows the obscure suture from which it is separated by a narrow space, thus 

 forming between the ribbed shoulder of one whorl and the spiral callus of 

 the other a deep channel ; aperture long and narrow, the canal not con- 

 stricted ; outer lip simple, nearly straight in the middle, receding deeply be- 

 tween the suture and the shoulder, thus making a sinus for the glaze-secret- 

 ing process of the mantle ; pillar concave in the middle, a little twisted, with a 

 strong siphonal fasciole upon which in the adult is a thick mass of callus on 

 the anterior half, on which ride one weaker posterior and three strong an- 

 terior plaits, behind which on the body of the whorl there is only a thin layer 

 of callus. Approximate dimensions of adult: Lou. 45.0; Ion. of aperture 28.0 ; 

 max. diam. 16.0 mm. 



Ripley sands of Tippah Co., Miss., Mr. Stanton. 



These specimens, being very soft, are mostly crushed or broken, but the 

 characters can be made out and the remarkable and elegant sculpture cannot 

 be mistaken. The brilliancy and lustre of the glaze would make this shell, if 

 perfect, one of the most beautiful and attractive of our fossils. The specimen 

 figured had the sculpture of the back best preserved, but this and other treas- 

 ures of the Ripley sands will doubtless be fully illustrated by Dr. C. A. White 

 in his promised study of that fauna. 



