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



Angles occupied by a deepish channel. A central, longitudinal depression upon each face. Fine, 

 regular, equal, close-set striae cover the whole shell. They turn back abruptly at their passage over 

 the lateral channel, at the bottom of which they are less distinct ; and they produce a simple undula- 

 tion where they traverse the central depression of each face. 

 We regard this specimen, which comes from Kemmenau near Ems, as the cast of the posterior part of 

 a species which we have found at Nehou (La Manche). This last, which we have also represented (at f. 4), 

 shows, upon the preserved part of the shell, little transverse ridges formed of rows of very fine and very 

 regular granulations, separated by smooth grooves (f. 4 b). These granulations have been more or less 

 destroyed by rubbing, and they are then represented by small irregular pores, also placed in rows (f.4c). 

 And lastly, in those parts from which the shell has completely disappeared, the stria observed upon the 

 cast are similar to those on the specimen from Kemmenau. As to its flattened form, we think it is the same 

 now as it was originally, and that it is not the result of compression after the death of the animal. It 

 may be admitted that there have been ConularicB of different forms, as there are among the HyalcECE and 

 Chodora of the present seas. 



The specimens represented by figs. 3, 5 and 6, PI. CCXL. of tlie Mineral Conchology, come pretty near 

 to our species. In fact, they differ, says Mr. Sowerby, from that represented by f. 4, the only one which 

 has served to establish the characters of the C qiiadrisulchta ; but we should be disposed to think them 

 still nearer to that figured at PI. XII. f. 22. of the ' Silurian System,' to which we preserve the name 

 given by Defrance, not believing it to be the same as the C. quadrisulcata from Coalbrook Dale. This 

 opinion appears to us to be further confirmed by that of J. Sowerby himself, and it also agrees with the 

 difference of geological position. 



From the Grauwacke of Kemmenau ; Nehou (La Manche, France) ; rare. 



2. Conularia ornata, nob.. Tab. nost., XXIX. f. 5, 5 a. 



Shell pyramidal, rectangular, consisting of four equal faces with a longitudinal channel on each angle. 

 Faces slightly convex, ornamented with oblique, equal, regular folds, finely plicated at their summit 

 and disposed in very open zigzags. On the middle of the faces, the folds diminish to overlay each 

 other in an alternately inclined manner, instead of continuing from one edge to the other. The row 

 of this sort of anastomosing folds, forms a longitudinal central elevation, though not very distinctly 

 marked. The folds reach to the edge of the corners, alternating and terminating at the base of the 

 channel with one or two small granulations. The transverse grooves which separate the folds are 

 perfectly smooth. 



This species is distinguished from C. quadrisulcata (Min. Conch. PI. CCXL. f. 4. and Geol. Trans., 

 vol. V. PI. XL. f. 2. Non id. Sil. Syst., PI. XII. f. 22.) in having wider folds with wider spaces, and 

 in the smoothness of the grooves which separate them. 



Refrath, Eifel; rare. 



3. Conularia Gerolsteinensis, nob.. Tab. nost., XXXI. f. 5, 5 a. 



Shell in form of a quadrangular pyramid, with a compressed, rhomboidal base. Surface rather irre- 

 gular, covered with transverse, capillary, very close-set, granular striae. These striae, whose con- 

 vexity is toM'ard the aperture, become more and more arched as they approach the summit, and 

 they correspond to the bottom of the grooves which follow the angles of the pyramid. 

 The extreme tenuity of the striae of this Conularia distinguishes it sufficiently from its congeners. 

 Judging from an impression which comes from the same beds, this shell was prolonged at its summit 

 into a recurved point, and it appeared to terminate anteriorly in part of a rounded vault. 

 Eifel ; rare. 



There is found in the limestone of Nehou a Conularia, C. Brongniarti, nob., (Tab. nost., XXXI. 

 f. 6, 6 a, 6 h.) which is of a similar compressed form with the Conularia Gervillei, but it is distinguished 



