146 FISSURELLA. 



More depressed than F. picta, with wider perforation. It is an 

 abundant species, and is well represented in figs. 46, 47 of plate 33. 

 The radiating riblets are usually somewhat granose. 



As varietal manifestations of F. maxima I am inclined to rank 

 the following described forms : 



Var. CONCINNA Philippi. PL 32, fig. 33 ; pi. 45, figs. 7, 8. 



Shell oblong, narrower in front, thick, whitish rayed with purple ; 

 perforation large, oblong, bidentate on either side ; margin rounded, 

 pale, crenated outside. 



Length 43, width 25, alt. 10 mill. ; length of foramen 6 mill. 



The form is narrower than F. oriens, and proportionally broader 

 behind. I count about 28 rounded large ribs alternating with the 

 same number of smaller ones, of about a third the size of the first, 

 with very narrow interstices between them. The growth-lines form 

 wavy wrinkles (the ribbing is unfortunately poorly rendered by the 

 artist). On a whitish ground there are about fourteen purple rays. 

 The edge is thick, rounded, not at all level and horizontal as in F. 

 latemarginata, and bordered by a narrow yellowish or brownish 

 crenated border. The interior is as usual, white. (Phil.) 



Chili. 



F. concinna PHIL. Abbild. iii, p. 66, t. 2, f. 5. 



Reeve's figure of this form is copied on pi. 32, fig. 32 ; I do not 

 know whether it really represents the species. The other figures are 

 Philippi's. I have specimens of maxima which answer to the de- 

 scription -and figures very well. 



Var. HONDURASENSIS Reeve. PI. 35, fig. 6. 



" Distinguished by the superficial wrinkled character of the spread- 

 ing ribs and the dark olive and black dotted marking around the 

 orifice." 



Hondurus f 



F. hondurasensis REEVE Conch. Icon. t. 7, f. 48. 

 This seems to me to be merely a young maxima. The locality 

 may be regarded as doubtful. 



F. PHILIPPIANA Reeve. PL 33, fig. 40 ; pi. 58, figs. 24, 25, 26. 



Shell ovate-oblong, rather depressed, black, sculptured with very 

 numerous radiating unequal riblets and elevated incremental striae ; 

 foramen oblong, horizontal, submedian ; margin black, crenulated. 



In its coloration and the narrow crenate border this species is 



