TROCHUS.—P arte VI. 
and the marginal scales are shorter and rather broader in 
proportion. 
Species 30. (Mus. Cuming.) 
Trocuus IMPERIALIS. Troch. testé umpliter umbilicata, 
abbreviato-conoided, alveariformi, purpureo-cinered, ad 
apicem rubra; anfractibus convexo-turgidis, deinde 
concaviusculis, undique seriatim muricato-imbricatis, 
ad marginem radiatim squamatis, squamis planis, 
magnis ; basi circa umbilicum levigatd, medio dense 
muricato-imbricata. 
IMPERIAL Trocuus. Shell largely umbilicated, 
shortly conoid, hive-shaped, purple-ash, red at the 
THE 
apex; whorls convexly turgid, then rather concave, 
everywhere prickly imbricated in rows, radiately 
scaled at the margin, scales flat, large; smooth around 
the base, densely prickly imbricated in the middle. 
Trochus solaris imperialis, Chemnitz, Conch. Cab. p. 135. 
pl. 173. f. 1714; and pl. 174. f. 1715. 
Trochus heliotropium, Martyn. 
Hab. New Zealand. 
The very characteristic West Indian type which we have 
just been describing in 7. dongispina and latispina, is mag- 
nificently represented in New Zealand by the single species 
under consideration, 7. imperialis ; and this peculiar form 
of Trochus, constituting Link’s genus Astralium, has not 
been collected in any other part of the world. 
