daia] notes on some upper cretaceous volutidtE 19 



swollen at the suture, in front of which there is a moderate constric- 

 tion, behind which there is a single spiral cord, obsolescent on the 

 later whorls ; the apical whorls have nine peripheral nodules at the 

 shoulder ; nucleus shelly, minute ; posterior sinus shallow, situated at 

 the suture ( see figure 6) ; anterior portion wanting. Lon. of spire 

 in fragment 38, diam. 20 mm. U. S. Nat. Mus., 20,573. 



A decorticated and much larger specimen from the same locality 

 appears to belong to the same species ; if so, the last whorl develops 

 near the anterior part of the outer lip distant and oblique spiral 

 threads (which appear on a patch of surface remaining), which 

 break up into low rounded pustules and seem not to have extended 

 far from the margin, but probably correspond to the denticulations 

 of the outer lip in the adult. This specimen, with an allowance of 

 14 mm. for its missing apex, measured : Lon. of shell 195, of aper- 

 ture 131; diam. at post, sinus about 48; max. diam. of last whorl 

 about 62 mm. (U. S. Nat. Mus., 20,576, part.) 



Upper Cretaceous of Bullock's Mill, near Dumas, Miss. U. S. 

 Geological Survey. 



This large species is well distinguished by its slender elongate 

 spire, its sculpture and the small number of its riblets. I am quite 

 confident, though not absolutely certain, that the large decorticated 

 specimen represents the adult of what I regard as the type specimen 

 (fig. 6) ; in which case it is probably the largest species of the genus, 

 of which the shell is known. Both specimens were collected at the 

 same time and in the same locality. 



VOLUTOMORPHA LIOICA Dall, n. sp. 



(Figure 8) 



Shell large, solid, with one strong plait between two shallow ex- 

 cavations, probably with two well-marked plaits in the early stages ; 

 spire short, conic, with about fourteen obsolete axial riblets on the 

 antepenultimate and earlier whorls ; sutural callus prominent, the 

 whorl in front of it slightly or not at all constricted; body of shell 

 smooth, anterior third with sparse obsolete sulci, becoming closer 

 on the canal ; posterior sinus deep, narrow, outer lip hardly reflected, 

 but with a few small pustular prominences on its outer edge; the 

 whole shell enameled. Lon. 117, max. diam. 47 mm. 



Collected by the U. S. Geological Survey from the Ripley forma- 

 tion of the Upper Cretaceous at Eufaula, Alabama. V. S. Nat. 

 Mus., 21,127. 



