GASTEROPODA. 187 
Somewhat similar to T. higatus, but much smaller, more delicate, 
more nacreous within, and partially umbilicated. It is still more like 
Margarita cinerea, but is more solid, and more delicately marked. 
Figure 208, the shell in profile; 208a@, base of the shell; 2083, 
details of the sculpture, enlarged. 
Trocuus ama@nus (Gould). 
Testa parvula, depressa, globoso-conica, levis, nitida, Susca, punctis lites 
ubique irrorata, et maculis piceis cum flavidis alternantibus ad 
suluram et ad peripheriam ornata: spira anfractibus quatuor ad 
quinque convexis, ad suturam constrictis : basis convexa, imperforata, 
concentricé striata: apertura sub-circularis ; regione columellari com- 
planata, alba; columella anticé dentifera ; labro acuto, striato ; fauce 
hvida, margaritaced. 
‘Lrochus amenus, Goutp ; Proceed. Boston Soc. Nat. Hist., 11. 107. 
April 1849. Expedition Shells, 58. 
SHELL quite small, depressed, globose-conic, smooth and shining 
above, with only delicate lines of growth above, and with very deli- 
cate concentric strie beneath; whorls four or five, convex, slightly 
constricted at suture, which is linear impressed ; colour chocolate, 
whole shell speckled with minute yellowish spots, with a series of quad- 
rate black dots, articulate with yellow, adjacent to the suture, gene- 
rally another series of smaller ones at the periphery, and sometimes 
still another at base; base imperforate; columellar region flattened, 
having a slight umbilical indentation, bony-white, having towards the 
base a transversely oblique, faint rib, which causes a slight tooth or 
gibbosity on the columella; edge of the outer lip bevelled ; within livid 
pearly, having numerous raised lines. 
Diameter three-tenths of an inch; axis one-fifth of an inch. 
Inhabits the Feejee Islands. 
A pretty shell, allied to some of the Mediterranean species, like 7’ 
