DOLIUM. Panama Shells. 73 



with five crowded spiral strire : apex acute : spire conic : whorls 

 eight, scarcely convex : aperture ovate : labrum much thickened, 

 with a few plaits inside : columellar lip irregularly plaited : 

 with a short well notched canal. 



Mean divergence about 38 ; length .72 inch ; breadth .32 

 inch. 



I take pleasure in dedicating this species to William Stimp- 

 son, Esq., whose researches on the Mollusca of this country 

 will furnish a most valuable contribution to Malacology. 



Station. Under stones, near low water mark. 



Habitat. Panama ; C. B. A. ! 



We obtained 19 specimens, of which a few only were alive. 



66. Dolium risigens. 



Synonymy. 



Cassis ringens Swains, in Bligh Catal. App. p. 4. May 1822. 

 Dolium dentatum Barnes Ann. Lye. Nat. Hist. N. York 



I. 135. 384. pi. 9. f. 3. 1824. 



Cassis ringens So wb. Tank, Catal. p. 21. 1825. 



Bucdnum Wood Ind. Test. Supp. pi. 4. f. 1. 1828. 



Dolium personatum Menke Synop. p. 62. 1830. 



Malea latilabris Valenc. in Humb. Rec. Obs. II. 325. 1833. 



crassilabris Valenc. in Humb. Rec. Obs. II. 327. var. 1834. 

 Dolium latilabre Kiener Iconog. p. 14. pi. 4. f. 7. 1835. 



Dolium plicosum Menke in Zeitsch. Malak. p. 138. 1845. 



ringens Reeve Conch. Icon. pi. 4. f. 5. Dec. 1848. 



dentatum Jay Catal. Dec. 1850. 



crassilabre Menke in Zeitschr. Malak. p. 182. Apr. 1851. 



One of our specimens is 4.25 inches long, but most of them 

 are small. One, with an excessively thickened lip and a deep 

 groove behind the lip, is only 2.3 inches long. Mr. Eeeve's 

 figure represents a fine specimen 5s inches long. One in the 

 Mus. Amh. is 6 inches long. Mr. Barnes notices a specimen 9 



inches long and 7 inches wide. 



6 



