FISSURELLA. 163 



minute regular black beads. A pink line defines the inner callus. 

 The worn but still pretty specimen is in Mr. Hanley's collection. 

 (Sowb.) 



Habitat unknown. 



F. monilifera SOWB. Thes. Conch, iii, p. 188, f. 175. 



F. LONGIFISSA Sowerby Jr. PL 58, figs. 27. 



Similar to F. macrotrema but vividly red rayed. Hole elongated, 

 tripartite, narrow. Inside callus rose-bordered. The fissure of this 

 brightly-rayed shell is so peculiarly long and narrow as to distin- 

 guish it from the preceding, which it otherwise resembles. (Sowb.) 



Habitat unknown. 



F. longifissa SOWB. Thes., p. 191, f. 66. F. macrotrema var. 

 Conchol. Illust., f. 41. 



A specimen before me is from the Gallapagos Is. It is very 

 closely allied to F. macrotrema. 



F. OBSCURA Sowerby. PL 31, fig. 25. 



Shell ovate-oblong, radiately costate, the riblets obtuse and rather 

 wide. Inside greenish, margin undulating, crenulated, paler. Out- 

 side radiately painted with varied colors, a few black dots radiating 

 around the hole. Hole subelongated, wider in the middle, the 

 callus surrounding it inside bordered with red. 



Length M, width 0'7 inch. (Sowb.) 



Gallapagos Is. 



F. obscura SOWB. P. Z. S. 1834, p. 125 ; Conchol. Illust., f. 27. 

 KEEVE, Conch. Icon., f. 46. SOWB. Thes., p. 191, f. 80. 



*** 



Species from the East Coast of America and the West Indies. 

 F. NIMBOSA Linne. PL 36, fig. 32. 



Shell long-ovate, elevated conical, the summit a little in front of 

 the middle. Sculptured with more or less obsolete radiating riblets. 

 Orifice oblong, a little contracted in the middle, from one-seventh 

 to one-ninth the length of the shell. 



The outline is long-ovate, a trifle narrower in front of the middle. 

 Color grayish-pink, with eleven or more broad black rays. Inside 

 light greenish, with a black line around the edge. The edge is 

 thin and finely crenulated. Length 45, breadth 32, alt. 17 mill. 



Garthagenct, New Granada; Venezuela; W. Indies (?). 



