CHEMNITZIA. 249 



angnlated at the circumference. The aperture, which 

 occupies about one-seventh of the entire shell, is very much 

 longer than broad, subrliomboidal, but well rounded an- 

 teriorly, and not sculptured internally. The outer-lip is 

 simple and acute ; the pillar is rather long, nearly straight 

 (not oblique) and very slightly twisted posteriorly. The 

 breadth of the largest individual we have seen, which 

 measured four lines in length, was only the sixteenth 

 of an inch. 



This species was discovered by Mr. Jeifreys at Oxwich 

 Bay, near Swansea, and has been taken at Shellness in 

 Kent, by Mr. G. B. Sowerby, and Bantry Bay by Mr. 

 M'Andrew. 



0, FENESTRATA, Forbcs aud Jeffreys.'"' 



White ; whorls subangulated, encircled below with two re- 

 volving keels, longitudinally ribbed above. 



Plate XCIII. fig. 6, 7. 

 Odostomia/etiestraia, Jeffreys, Ann. Nat. Hist, new ser. vol. ii. p. 345. 



This species, observes Mr. Jeffreys, who was the first 

 to describe this exquisitely sculptured shell, " was first 

 noticed and named by Professor Edward Forbes at the 

 meeting of the British Association in 1846, but no account 



* Brown's figure of his Pyramis spirolinus (Illust. Conch. G. B. p. 15, pi. J), 

 f. 66) displays much of the peculiar aspect of the C.fenestrata^ but his description 

 does not confirm the identification : — 



" White, abruptly tapering, with seven deeply divided, somewhat triangular, 

 volutions, with a subcarina near the lower margin of each, from whence they 

 suddenly oblique towards the suture ; provided with about fom-teen rather strong, 

 longitudinal ribs, and these are crossed by numerous, rather wide, spiral striae, 

 giving the shell a cancellated appearance, aperture suboval, slightly contracted 

 above ; outer-lip thin ; pillar lip reflected on the columella. Length somewhat 

 more than an eighth of an inch ; breadth about half its length." The type was 

 picked up by the author from the beach at St. Cyrus, Kincardineshire. 

 VOL. III. K K 



