DOLIUM. Panama Shells. 73 



with five crowded spiral striae : 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 .82 

 inch. 



I take pleasure in dedicating this species to William Stimp- 

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

 will furnish a most valuable contribution to Malacology. 



Station. — Under stones, near low water mark. 



Habitat. — Panama; C. B. A.I 



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



66. Dolium ring;en8. 



Synonymy. 



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



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



I. 136. 384.pl. 9. f. 3. - - - - 1824. 



Cassis rinffens Sowb. Tank. Catal. p. 21. 1826. 



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



Dolium personatum Menke Synop. p. 62. 1830. 



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



crosst^aJm Valenc. in Humb. Rec. Obs. II. 327. var. 1834. 



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



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



— — — ringftis Reeve Conch. Icon. pi. 4. f. 5. Dec. 1848. 



dentatum Jay Catal. Dec. 1850. 



crassilahre 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. Reeve's 

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

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

 inches long and 7 inches wide. 

 19 



