98 BULLETIN OF THE 



Subgenus COKDIERIA Rouault. 



Cordieria Rouault, Bull. Soc. Ge'ol. de France, 2me ser., V. p. 207, February, 1848. 

 fAp/tanitoma Bellanli, Moll. Terz. Piemonte, pt. ii. p. 241, 1877. 

 ? Scobinella Conrad, Journ. Acad. Nat. Sci. Phila., 2d ser., I. p. 120, August, 1848. 

 Type, S. coelata Conr., /. c, pi. xii. figs. 8, 9. 



The type of Scobinella has the anal sinus of a Pleurotoma and the plaits of a 

 Mitra (4 or 5) diminishing in size forward. Cordieria has two plaits, which 

 are high up, not anterior, like those of Mitra. In some specimens the second 

 plait is not deposited until a little later than the first, and lags behind it, so 

 that it is not always visible. From this fact has been derived the erroneous 

 assumption that the same species may have, indifferently, one or two plaits. I 

 have not seen Aphanitoma, which Tryon unites with Scobinella ; but, whether 

 this be just or not, it appears to me that Scobinella is different from Cordieria 

 and sufl[iciently distinct from Borsonia. As far as I can judge, Tryon was right 

 in suspecting that none of the Borsonias in his Manual belong to the genus. 

 They probably belong to Eucheilodon, Glyphostoma, or Clathurella. The pres- 

 ent species, however, is genuine, and typical to a very high degree. The genus 

 remounts to the Cretaceous. 



Cordieria Rouaultii n. s. 



Plate XXXVI. Fig. 11. 



Shell yellowish white with a pink vertex and the interspaces between the 

 ribs of a pink brown, generally rather pale ; whorls seven or eight, two of 

 which belong to the nucleus ; nucleus glassy polished, smooth, swollen, rounded, 

 its second whorl with an obsolete peripheral keel ; remainder of the shell with 

 rather strong sculpture ; spiral sculpture of three or four strong and a few 

 much finer ridges between the sutures and in front of the anal fasciole ; on the 

 last whorl these continue over the base and canal ; the anal fasciole shows only 

 traces of the finer spiral threads ; transverse sculpture (1) of nine stout short 

 waves, or rounded ribs, with narrower interspaces, beginning in front of the 

 fasciole and obsolete in front of the whorl toward the canal ; (2) of rather 

 coarse, strong, and somewhat irregular incremental lines ; (3) where the fasci- 

 ole borders on the suture, the arched incremental lines are crowded into a 

 series of not very regular plications, which form a band or series in front of 

 the suture ; the fasciole is slightly excavated ; the surface of the shell carries 

 a yellowish opaque thin epidermis ; whorls moderately rounded ; base sub- 

 conical ; canal short, rather large, slightly recurved and flaring at the tip ; 

 anal sinus rounded, rather shallow ; outer lip convexly arched, sharp-edged, 

 with or without a rib behind it, according to the stage of growth, with no 

 varix; aperture narrow, long lirate in the throat; columell a straight, near 

 its junction with the body having two strong plaits, which continue in- 

 ternally to the apex of the shell ; inner lip with a coat of callus, somewhat 



