COLUMBELLA. Panama Shells. 97 



100. Coluinliclla pyginma. 



Synonymy. 



Columhella pygmma Sowb. in Proc. Zool. Soc. Lond. p. 119. June 1832. 



Miill. Synop. Nov. Test. Viv. p. 00. May 1836. 



Sowb. Thes. Conch, p. 141. No. 89. pi. 



40. f. 163. 1844. 



Station. — On dead shells in saudy mud, at a deptli of 10 

 fathoms ; Cuming I Sowerby. 



Our specimens were found under stones at low water mark. 



Habitat. — St. Elena ; Cuming 1 Sowerby : also Miiller. 



St. Elena ; Jay. 



Panama ; C. B. A. I 

 We collected on the reef 185 specimens of this pretty species. 



101. Columbella rug^osa. 



Synonymy. 



Columbella rugosa Sowb. in Proc. Zool. Soc. Lond. p. 115. June 1832. 



Mull. Synops. Nov. Test. Viv. p. 84. 1836. 



Sowerhyi Duel, in Chenu, HI. Conch, pi. 19. f. 5. 6. ? 1843. 



bicolor Kiener Iconog. p. 46. pi. 16. f. 4.? 



rugosa Sowb. Thes. Conch, p. 130. No. 53. pi. 38. 



f. 114-5. 1844. 



There are three principal varieties, which freely graduate 

 into each other. The first has a few distant tubercles on the 

 lower whorls : the second has ribs on the first part of the last 

 whorls, but they are rather short and wide : in the third these 

 ribs of the last whorl are narrow and long. Specimens of a 

 diminutive size are very common. About two thirds of those 

 which we collected are from .60 inch to .75 inch long ; about 

 one fourth of them range from .35 inch to .50 inch in 

 length. The epidermis is brown, and very thin but tough. 



Station. — Under stones ; Cuming 1 Sowerby. 

 Our specimens were found under stones between half tide 

 and the low water mark of neap tides. 



JULY, 1852. 25 Abu. Lto. Nat. Hist. 



