225 



the anterior-half of the body- whorl, the ribs are reduced to stout 

 nodosities. There are three stout varices on the spire. 



Aperture nearly circular ; peristome complete with a groove 

 around its inner margin, the exterior of the outer lip formed by 

 the very thick varix ; base rounded. 



Dimensions. — ^Length, 4'5 ; width, 1; height of aperture, 1. 



Locality. — Eocene ; Muddy Creek (one ex.). 



This species is separable from *S'. Hamiltonensis, by its smaller 

 size, slenderness, and discontinuity of the costa?, &c. 



This and the next two species I have referred to De Boury's 

 genus Hodiscala, despite the absence of a basal disk, though some 

 of De Boury's species which have the disk feebly developed may 

 be regarded as connecting these extreme forms with the typical 

 species. 



3. Sealaria (Nodiseala) prionota, spec. nov. 



Shell turrited, slender, acute, stout, imperforate ; ordinary 

 whorls eight, slightly convex, costated and sparsely variced ; 

 nuclear whorls unknown. 



The transverse ornament consists of stout rounded nearly 

 straight costse, which are a little produced upon and adpressed to 

 the preceding whorl, so that the sutural line is conspicuously 

 sinuate-dentate ; on the body-whorl they extend on to the base, 

 are a little angulated and nodosely enlarged at the periphery. 

 There is only one varix on the spire. The spiral ornament con- 

 sists of very narrow flat threads, with linear punctated inter- 

 spaces (about 20 on penultimate whorl), which are continuous 

 across the costa?. 



Aperture obliquely oval ; peristome entire, grooved around ; 

 the exterior lip formed by the very thick varix. Base rounded, 

 without carina or special sculpture. 



Dimensions. — -Length, 8 ; width, 2-5 ; length of aperture, 2. 



Locality/.— 'Eocene. Muddy Creek (one ex.). 



S. j^f'ionota differs from >S'. Hamiltonensis in being less slender, 

 coarsely punctated, and by its crenate-dentate suture. 



4. Sealapia (Nodiseala) Hamiltonensis, sjoec. nov. 

 Shell elongate-turrited, acute, stout, imperforate ; ordinary 

 whorls seven ; flatly convex, costated and sparsely variced, 

 suture linear ; nuclear whorls two, smooth, rounded. The trans- 

 verse ornament consists of thick, filiform, nearly straight costse, 

 slightly attenuated at the posterior suture, but continuous from 

 whorl to whorl ; on the anterior-half of the body-whorl, they are 

 slightly nodosely elevated in the middle, but are evanescent at 

 the base ; there are about 10 on the body-whorl, but about 12 on 

 the penultimate-whori. Varices very irregularly disposed rarely 

 more than two or three on the spire. 



