ODOSTOMIA. 307 



such condition, that, although we have failed in identifying 

 it, we can positively assert its individual distinctiveness from 

 any of the species we have described — yet since much 

 uncertainty has always existed as to what Montagu really 

 intended, we have held it desirable to carefully describe 

 and delineate the example. 



? PALLIDA, Montagu. 



Oblong-turreted, regularly tapering ; whorls flattish, devoid of 

 longitudinal sculpture ; spire twice as long as the mouth j no 

 tooth. 



Plate XCVIII. fig. 4. 



Turbo pallidas, Mont. Test. Brit. vol. ii. p. 3-25 ; Suppl. p. 133, pi. 21, f. 4. 

 Valuta ambigua, M.iTON and Rack. Trans. Linn. Soc. vol. viii, p. 132. — Dillw. 



Recent Shells, vol. i. p. 510. — Wood, Index Testae pi. 19, 



f. 28. 

 Phasianella pallida, Fleming, Brit. Animals, p. 302. 

 Cingula „ Brit. Marine Conch, p. 185. 



Rissoa „ Bkown, 111. Conch. G. B. p. 13, pi. 8, f. 24. 



The authors we have quoted have derived their whole 

 knowledge of the species from the individual described in 

 the " Testacea Britannica." The specimen, when perfect, 

 had an oblong-turreted figure, and was composed of six or 

 seven moderately tapering fragile whorls, of which only 

 about the four-and-a-half larger ones now remain. 



They are moderately tapering, very little convex, of gra- 

 dual longitudinal increase, very slightly more rounded 

 below, somewhat planulate beneath the oblique and cana- 

 liculated suture. The dull white surface is almost smooth, 

 yet traces exist of what we imagine to have been spiral 

 striae, and there seems an impressed line (perhaps accidental) 

 below the suture of some of the smaller turns likewise. 

 The body would not apparently compose more than two- 

 fifths, at most, of the total length of the perfect shell ; it 

 is well rounded at its periphery, and declines below with a 

 gradual and decidedly convex slope. The mouth would 

 probably occupy one-third of the entire length ; it is of a 



