l)ESt:RirTIONS OF INVERTEBRATE FOSSILS. i^O . 



the Caprina limestone that yielded the S. jAaiiorhis; viz.. 

 Ndfica (ivcUfDta, Roeui. 



TURRITELLA DENISONENSIS, sp. UOV. 



This name is proposed for a large, tall-spired, species of 

 Tnrvitclla that seems to bear considerable resemblance to 

 T. IconeuMS, Con., and is possibly only a variety of that species, 

 ])nt which, instead of havinej all of the whorls convex and 

 evenly rounded, as they are understood to be in leonensis, 

 has only the spire-whorls so, the body-whorl being enlarged 

 and angulated or shouldered, presenting a strongly flattened, 

 sloping face on its upper (posterior) part, a broader flattened 

 face on its middle part, and a less strongly flattened face on 

 its lower part. The casts show weathered remnants of raised, 

 narrow, cariniform lines, separated by broad, depressed inter- 

 vals, in each of which is a similar but feebler line; lines of 

 the body- whorl apparently irregularly turberculated, those of 

 the spire-whorls not obviously so on the only shell-fragment 

 observed. The shell has evidently consisted of not less than 

 ten or eleven whorls. 



Measurements (of cast).— Height about 107, breadth of 

 body-whorl 40 mm.; angle of spire-slopes 21 to 24 degrees. 



Occurrence.— T\\e casts of this shell abound in the Choc- 

 taw limestone, at the top of the bluff of Pawpaw creek east 

 and southeast of Denison, Texas. A single example was found 

 in the Grayson marl, in the cut of the abandoned D. B. and 

 N. O. railway, southeast of the Denison Union depot. 



Vanikoro propinqua, sp. nov. 



Shell rather small, depressed-subglobose, thin or of moder- 

 ate thickness; whorls four, convex, those of the spire not 

 prominently so: body-whorl greatly enlarged, rounded, some- 

 what narrower and more elevated than in V. ambigua, M. & H. ; 

 spire rather low, proportioned almost exactly as in V. amhigua; 

 suture not deeply impressed; axis ('? perforate); aperture 

 rhomboidal-ovate, angular above, obtuse below; ornamenta- 

 tion unknown. 



Dimensions. — Somewhat smaller than V. ambigua, M.& H., 

 the exact dimensions not mensurable owing to the imperfec- 



