354 Viscount (I'Archiac and M. de Verneuil's 



central part. The aperture has the form of a complete instead of a truncated ogive, and striae like those 

 of the typical variety are not perceptible. 

 Wissenbach. 



4. Belleroplwn elegans, de Fer. et d'Orb., PL VII. f. 15-18. Tab. nost., XXIX. f. 2. 2 a. 



Shell globular, nautiloid, entirely covered with fine, longitudinal, pretty regular striae decussated by 

 less prominent transverse striae, which turn backward slightly, passing over a scarcely evident central 

 varix striated like the rest of the shell. Aperture large, rounded. Left lip reflected upon the two 

 sides of the last turn but one of the spire and partly masking a very small umbilicus. 



PafTrath ; rare. 



Rostelluria ? 



We refer to this genus, not unhesitatingly, an impression which we found in the Grauwacke of Priim 

 in the Eifel. 



1. Buccinum arculatum, nob. Buccinites arculatus, Schlot. PI. XIII. f. 1. Tab. nost., XXXII. f. 1. 



We unite under the name of Buccinum arculatum several shells different enough at first sight, of 

 which a figure given by Schlotheim may be regarded as the principal type. 



The last volution being very much inflated at the base, gives the shell a regular conoidal form. The 

 volutions are bounded above by a very broad area, generally flat, sometimes slightly concave or even 

 convex. This area is bounded externally by a more or less distinct, rounded varix which accompanies 

 it to the top of the spire. The volutions are flattened or very slightly convex. In the elongated variety 

 a depression is seen below the varix, which is more rounded, the area is contracted and has a tendency to 

 disappear. In the most inflated variety, which we have figured, the first volutions are ornamented with 

 small, longitudinal folds, inflected toward the middle, and pretty regularly oblique toward the axis. 

 Upon the last volution, these folds have only the character of striae of growth. On the contrary, in the 

 very elongated specimens they are less regular upon the first volutions, and the whole shell only presents, 

 lines of growth. The different varieties show upon the middle part of the volutions four or five obsolete, 

 transverse, undulated grooves parallel to the suture. The aperture little, slightly truncated, and effuse at 

 the base, is rather narrow. The left lip is covered with a callosity which rises to the upper angle and hides 

 a very small umbilicus, and then spreads over its lower extremity without forming a distinct canal. 

 Columella wide, flattened, and furnished at its base with a more or less distinct fold. Right lip sharp- 

 edged, simple, slightly sinuous and oblique to the axis. Upper angle sharp, but widened by the extension 

 of the varix. 



Altitude of the variety figured, 93 millim. Diameter of the last volution, 53 millim. 

 , Paffrath ; very common. 



2. Buccinum Schlotheimii, nob. Buccinites subcostatus, Schlot. PI. XII. f. 3. Macrocheilus arculatus, 

 Phil. Pal. Fos., PI. LX. f. 194.*. Tab. nost., PI. XXXII. f. 2. 



Shell turriculated, mucronated at the summit, more or less inflated toward its medio-inferior part and 

 contracted at the base, composed of nine volutions, of which the first are covered with fine, 

 longitudinal, rather oblique, undulated and pretty regular folds, while the last usually present only 

 lines of growth. Suture simple, deepish. Aperture narrow, very contracted at its upper angle, 

 a little dilated and rounded at its base. The truncation is scarcely evident. Left lip covered to 

 the top by a wide callosity, rarely well-preserved. Columella very much flattened, offering in some 

 individuals two rather distinct folds which are confounded at the base by a very short rounded one. 



Height of the largest specimens, 137 millim. ; diameter of the last volution, 50. 



This species is not less variable than the preceding, and we might even say that it is connected with it 

 by intermediate forms which would have determined us to unite them if we had not found some charac- 



