200 LUCAPINA. 



side bluish-white, showing the dark marking of the outside through 

 the thin shell. Hole-callus usually having a greenish streak on 

 each side, truncated behind. Edge crenulated. 



Florida specimens of the typical form measure: 



Length 21, breadth IV, t alt. 4J mill. 



Length 21 breadth Hi, alt. 5 mill. 



Key West, Florida ; St. Thomas and St. Croix, West Indies, 



F. adspersa PHIL., Abbild. etc. ii, p. 34, t. 1, f. 3, (Oct., 1845). 

 F. aegis REEVE, Conch. Icon., f. 72, (June, 1850). SOWB. Thes., p. 

 201, f. l8S.Lucapina t fasciata (Pfr. Where?) DALL, Proc. U.S. 

 Nat. Mus. 1883, p. 336. Fissurellldea fasciata Pfr., DALL, Catal. 

 Moll. S.-E. U. S., p. 172. 



This species may be considered the type of Chlamydogh/phis. It 

 differs from elongata Phil, in the larger size, more convex side 

 margins and less excentric orifice; from cancellata in being lower, 

 and not stained with blue-black around the orifice. 



The external anatomy has been described by Dall (/. c.). From 

 his description my knowledge of it is derived; unfortunately the 

 form of the gills and the dentition is not yet known. The localities 

 given are for specimens in the collection of the Academy. 



In the typical adspersa the color-rays are much interrupted into 

 dots and spots. In the form called aegis by Reeve (pi. 38, fig. 69) 

 the rays are continuous. Intermediate specimens are to numerous to 

 permit me to call cegis a variety. The largest specimen before me 

 measures, length 30, breadth 17, alt. 5 mill. 



F. lentiginosa Rve. (pi. 36, fig. 33) seems to be a synonym of the 

 typical adspersa. 



L. CANCELLATA Sowerby. PI. 63, figs. 1, 2, 3 ; pi. 37, fig. 58. 



Shell oblong-ovate, conical, stained with bluish-black around the 

 orifice and the internal hole-callus. Sculptured with alternately 

 larger and smaller radiating riblets, latticed by concentric raised 

 threads. Orifice in front of the middle, oval, about one-eighth the 

 length of the shell. 



White or pale brown, unicolored or with pale brown rays, or 

 flecked with brown dots. Inside white, hole-callus bluish -black, 

 slightly truncated behind. Length 23, breadth 15, alt. 62 mill. 



Bahamas and Tortugas south to St. Thomas and St. Barts. 



F. cancellata (Solander mss.) SOWERBY, Conch. 111. f. 29. REEVE, 

 Conch. Icon. f. 51. SOWB., Thes., p. 200 f. 189. ARANGO, Fauna 



