Mollusca.] 
NATURAL HISTORY. 
479 
n. COCHLEOPHORA. 
26. Trochus CiERULEsCENs, Lam. Hist. vii. 18. 
Icon. Ency. Mcth. pi. 444. f. 2. a, b. 
Inhab. J^outh-west Coast. 
Lamarck describes this shell from a specimen found by P6ron. 
27. Trochus nobuliferus, Lam. Hist, vii. 18. 
28. Monodonta conica, (n. s.) 
Testa conica, acuta, imperforata, spiraliter striato-costata, 
rufa ; costis subtuberculatis, albo-nigro-articulatis ; aper- 
tura sulcata. 
Inhab. Mus. Brit. 
Shell conical, axis longer than the diameter, the whorl flattened 
with six spiral raised substrise, which are transversely divided 
into blackish purple beads with white interspaces, the apex rather 
acute ; the base, rather convex, axis imperforated ; the aperture 
subquadrangular, inside furrowed ; the base of the columella lip 
with a prominent tooth and distinct groove behind it, the upper 
part rugose ; axis eight-twelfths, diameter six-twelfths ot an inch. 
This shell does not appear to be uncommon on the coast of Australia. 
29. Monodonta granulata, (n. s.) 
Testa depressO’Conica, umbilicata, purpurea, albomarmorata, 
spiraliter papillata ; papillis quadri-seriatis, umbilico 
Icevi ; injima facie papillata, apertura sulcata. 
Inhab. Mus. Brit. 
Shell rather depressed, conical, purple variegated with white, 
generally concentrically wrinkled, and ornamented with granulated 
spiral ribs, the ribs of the upper part of the last, and of all the other 
whorls rather distant, and forming four series ; those of the under 
part rather closer, and smaller. The axis unbilicated, smooth, the 
aperture roundish, the outer lips furrowed, the columella lip smooth 
with a groove at its base, axis four-twelfths, diameter five-twelfths 
of an inch. 
SO. Monodonta denticulata, (n. s.) 
Testa depresso-conica, umbilicata, rufa,nigro punctata, spU 
raliter sulcata, subgranulata, umbilico extus crenato. 
Inhab. — " Mus. Brit. 
