115 



INK) CICATRICOSLS. 



Plati LX1V. 

 DESCRIPTION 



Shell Mibovate; anterior margin very short, hardly 

 extending beyond the beaks regularly rounded; pos- 

 tehor margin rounded, or very obtusely angulated; 

 umbo t levated; Cosset behind the beaks moderate, 

 wider than long, not angulated before; disk deeply 

 wrinkled or undulated, with a series of transverse 

 elevations, sometimes separated by small longitudinal 

 lines, so as to resemble, as it were, drops of a liquid, 

 extending from the umbo to the base; within white; 

 cardinal teeth direct. 



BYNONYMES. 



IT. < n vTBirosis, Say. New Harmony Disseminator, 1*29. 

 17. vAHicosrs, Lea. Trans. Amer. Philos. Hoc., new series, vol. 

 u. p. 100, p|. 11, fig. xx. 



OBSERVATIONS. 



" \ common species, distinguishable by the single 

 ■eriea of transverse elevations on the middle. The 

 allied species are U. cardisce and U. incurvus* nob. 

 Amongst the numerous species sent to me by Mr. 

 Barnes, previously to the publication of his paper, 



* I think these two species have long since been published 

 under the names -of cordata and iniorta, I therefore suppress the 

 descriptions." Say 



