TROCHUS.—Ptate III. 
Pyramis dentatus, Adams. 
Hab. Red Sea. 
Mr. Adams gives Port Essington as the habitat of this 
well-known species, but I have not been able to confirm 
it, and I fear that some allied Australian species may have 
been mistaken for it. Be that as it may, 7. dentatus is 
well known to be a native of the Red Sea. 
Species 13. (Mus. Cuming.) 
Trocuus attus. Troch. testa excavato-umbilicatd, acute 
conicd, albd, viridi et purpureo conspicue strigatim 
tessellata ; anfractibus plano-declivibus, undique validé 
nodoso-granatis ; basi nitide granosd, sparsim rufo 
punctata. 
THe uieH Trocuus. Shell excavately umbilicated, 
sharply conical, white, conspicuously tessellated in a 
streaked manner with purple and green ; whorls flatly 
sloping, strongly nodosely grained throughout; neatly 
grained at the base, sparingly dotted with red. 
Putiiprt, in Kiister, Conch. Cab. Trochus, p. 217. pl. 32. 
tis Ue 
Trochus turris, Philippi. 
Polydonta turris, Adams. 
9 
Hab. 
Partaking very much of the character of 7. maculatus, 
from which it is chiefly distinguished by its firm sharply 
conical form. 
Species 14. (Mus. Cuming.) 
TROCHUS TENTORIUM. 
abbreviato-conicd, alveariformi, virescente ; anfractibus 
oblique fortiter nodoso-costatis, interstiis dense granoso- 
clathratis ; basi plano-concavd, yranata, roseo sparsim 
minute punctatd, margine rotundato. 
Troch. testd excavato-umbilicata, 
| 
THE PAVILION TRocuvs. Shell excavately umbilicated, 
shortly conical, hive-shaped, greenish; whorls ob- 
liquely strongly nodosely ribbed, interstices closely 
grain-latticed ; base flatly concave, grained, sparingly 
minutely dotted with rose, margin rounded. 
Cuemnirz, Conch. Cab. vol. v. p. 90. pl. 169. f. 1628. 
Polydonta tentorium, Adams. 
Hab. Philippine Islands. 
Dr. Philippi is wrong in citing this species as a variety 
of 7. maculatus. The shell here figured, truly assigned to 
it by Mr. Adams, is of quite another specific type, strongly 
nodosely ribbed, the interstices being closely latticed with 
rows of grains, while it is always of a uniform pale-green 
colour. 
Species 15. (Mus. Cuming.) 
TrocHus concinnus. Troch. testd subprofundé excavato- 
umbilicatd, subpyramidali-conicd, virescente, purpureo- 
rufo tessellata et strigatd ; anfractibus plano-declivibus, 
seriatin dense granatis, ad marginem tuberculato-squa- 
matis; basi dense granoso-liratd, virescente, livido-pur- 
pureo peculiariter radiatim flammata. 
Tue pretry Trocnus. Shell rather deeply excavately 
umbilicated, somewhat pyramidally conical, greenish, 
tessellated and streaked with purple-red ; whorls flatly 
sloping, densely grained in rows, tubercularly squa- 
mate at the margin ; densely grain-ridged at the base, 
greenish, peculiarly radiately flamed with livid-purple. 
Puruprt, Zeitschr. fiir Malak. 1846, p. 105. 
Polydonta squamigera, Adams. 
Hab. ——? 
The lower margin of each whorl is armed with strongly 
developed spouted tubercles, and the base of the shell is 
painted in a characteristic manner with zigzag radiating 
flames of livid-purple, well represented in one of Dr. 
Philippi’s figure. 
