TROCHIDAE 



117 



Indies, Although fairly good specimens are found without their soft parts 

 in southern Florida and Bermuda, this species has been extinct in those areas 

 for several hundred years. Living individuals may be found abundantly in 

 the West Indies where they are used in chowders by some people. Cittariwn 

 Philippi 1 847 is this genus. 



Livona pica Linne West Indian Top-shell 



Figure 3:] 



Southeast Florida (dead) and the West Indies (alive). 



2 to 4 inches in length, heavy, rather rough, and with splotches of pur- 

 plish black on dirty-white. Umbilicus round, narrof and very deep. Inner 

 edge of lip with rich cobalt-blue mottlings. Operculum horny, large, round, 

 multispiral and opalescent blue-green in life. 



— Ten+ac(e 



Figure 34. West Indian Top-shell, Livona pica Linne. a, shell with animal ex- 

 tended (3 inches); b, outline of head X2. (From Clench and Abbott 1943 



in Johnsonia.) 



Genus Norrisia Bayle 1880 

 Norrisia norrisi Sowerby Norris Shell 



Plate 1 8m 



Monterey, California, to Lower California. 



1 34 inches in length, slightly wider, heavy, smoothish with a glossy 

 finish, especially on the underside. Lip sharp. Aperture thickened within 

 and pearly. Umbilicus ovate, very deep, colored a greenish blue on the 

 columellar side, bordered on the other side by glossy black-brown which 

 fades into rich chestnut over the remainder of the shell. Operculum, multi- 

 spiral, externally ornamented with spiral rows of dense bristles. Animal 

 tinged with red. Moderately common among the kelp weed beds. 



