INVERTEBRATE PALEONTOLOGY. 337 



thium inaquiliratvm, C. secale, and C. mundulmn, Deshayes, from the Paris- 

 basin Tertiary; all of which very nearly resemble it in form and surface- 

 markings Our shell, however, has a more quadrangular aperture than any 

 of these, and also differs in having the lower edge of its columella raised in 

 the form of a much more distinct, less oblique, ridge, as well as in showing 

 traces of one or two much smaller ridges above. 



Locality and position. — Moreau River; from the Fox Hills group, appar- 

 ently very rare. 



PYRAMIDELLIDiE. 



Genus CHEMNITZIA, dOrbigny. 



Synon.— Chemnitzia, d'Orbigny (1850), Paleont. Francaise Terr. Jurass., II, 30 (not (1839) Moll. Cauar., 77, 

 which is = Turbonilla, Rfsso, 1826).— Conrad (1860), Jour. Acad. Nat. Sci. Philad. 

 (new ser.), IV, 287.— Gabb (1861), Synop. Moll. Cret. Form., 40.— Stoliczka (1808), 

 Palreout. Indiea, II, 280 ; and in part of many others. 



Etym. — Dedicated to the couchologist Chemnitz. 

 Examp. — Chemnitzia melanopsis, Conrad. 



Shell of comparatively large size, and elongate-conical, with spire many- 

 whorled and not reversed at the apex ; last volution generally moderately 

 large and somewhat produced below; aperture ovate, sometimes faintly effuse 

 at the base ; peritreme not continuous ; outer lip sharp, with usually a faintly 

 sinuous outline near or above the middle; inner lip a little thickened, or 

 rather thin; columella somewhat arcuate, and without plaits, folds, or umbilical 

 perforation ; surface ornamented with regular, vertical, more or less arcuate 

 or sigmoid costse or lines, sometimes crossed by revolving striae — rarely 

 nodular. 



The name Chemnitzia has been so variously used that it becomes a 

 matter of some doubt to what genus it should be applied, or even whether it 

 ought not to be discarded entirely. As first proposed by d'Orbigny in. 1839 

 in Webb and Ber-thollet's Natural History of the Canaries, it was founded on 

 a very small, elongate-conical, costated shell, with a sinistral apex (C. campa- 

 ndlce, zz Melunia campanellce, Phillipi), which, according to all authorities, 

 belongs to the genus Turbonilla, Risso, 1825 or 1826. As this was 

 d'Orbigny's typical and only species, it would seem beyond question that his 

 genus Chemnitzia of 1839 is a synonym of Turbonilla, Risso. 



At a later date, however, d'Orbigny, in his great work "Voy. dans 



FArafr. Merid., V," included a number of other small recent species under 



his name Chemnitzia, some of which are congeneric with his original type, 



while others belong to several other genera, according to later classifications. 



43 li 



