162 FISSURELLA. 



tinct. Margin prettily crenulated, dotted at irregular intervals on 

 the very edge with black. 



Length 32, breadth 2H, alt. 11 mill. 



Length 30, breadth 18, alt. 9 mill. 



Length 28, breadth 19. alt. 11 mill. 

 Lagoon Head (Mainland of Lower California opposite Cedros Id.) 



This species, collected by Henry Hemphill in 1889, seems quite 

 distinct from other forms I have seen. The crimson interior is es- 

 pecially notable. 



F. MICROTREMA Sowerby. PI. 34, fig. 55. 



Shell ovate, somewhat attenuated anteriorly, rather depressed, 

 rough, radiately thinly ridged, some of the ridges rather prominent ; 

 orifice minute; brown, sprinkled with a very few whitish spots, 

 ridges purple-red ; dark green around the orifice ; interior greenish. 

 (Eve.) 



Real Llejos, Central America. 



F. microtrema SOWB. P. Z. S. 1834, p. 125 ; Conch. Illust., f, 50. 

 REEVE Conch. Icon. f. 44. SOWB., Thes., p. 190, f. 54, 55. 



Sowerby says : foramen small, black margined, situated above 

 the middle, calloused inside, the callus white, black-margined. 

 Like asperella but with the minute ribs imbricated. 



Rochebrune has reported this species from the Cape Verde Is. ; 

 but his identification is probably incorrect. (See Nouv. Arch, du 

 Mus. 1881, p. 271.) 



F. ASPERELLA Sowerby. PI. 31, fig. 23. 



Shell ovate, somewhat attenuated anteriorly, rather depressed, 

 radiately striated and obsoletely ribbed, roughened throughout with 

 raised dots ; orifice ciblong-ovate ; variegated with olive and red, 

 rayed anteriorly with white. (Eve.) 



Lobos Island, Peru. 



F. asperella SOWB. P. Z. S. 1834, p. 127 ; Conch. Illust., f. 71. 

 REEVE, Conch. Icon. f. 58. SOWB., Thes. p. 190, f. 56. 



F. MONILIFERA Sowerby Jr. PL 58, fig. 28. 



Shell oval, conic, rugose, with radiating alternately black and 

 fulvous beaded riblets. Hole large, oval, somewhat narrowed in the 

 middle. Internal callus with a red line. This must have been a 

 beautiful shell in living condition, the alternate ribs consisting of 



