GASTEROPODA. 133 
MELanra TETRICA (Gould). 
Testa oblonga, turrita, ponderosa, fusca, liris paucis cincta: spira 
truncata, anfractibus superstitibus tribus ad quatuor convexiusculis, 
postice sub-angulatis et spinis validis acutis quinque ad basim decur- 
rentibus armatis, interdum muticis: sutura profunda: apertura arcteé 
elliptica ; intus livida. 
Melania tetrica, Goutp; Proceed. Boston Soc. Nat. EMisti i 222: 
June 1847. Expedition Shells, 44. 
SHELL oblong, turreted, solid, dusky brown, composed of three or four 
whorls, besides several at the summit removed by erosion. Whorls 
elongated, somewhat convex, obtusely angular above. On the angle 
are about five long, sharp, stout, diverging spines, which are gene- 
rally more or less eroded, and sometimes entirely removed, leaving the 
shell unarmed. There are a few unequal, longitudinal folds or ridges, 
generally originating from the base of the spines and extending but 
a short distance. Suture profound. There are also coarse, raised, 
revolving striw, larger towards the base, and alternately larger and 
smaller. Aperture narrow, elliptical; lip sharp; interior livid. 
Length one inch and one-fourth ; breadth five-eighths of an inch. 
Inhabits the Feejee Islands. 
More slender than the preceding, and with more convex whorls. 
It has nearly the same form as M. bellicosa, Hinds, but is larger, less 
plaited, and has fewer spines. It is especially distinguished by its few 
stout spines directed outwards. Some specimens are much like M. 
Winterz, Von den Busch. 
Figures 153, 153 a, two views of the shell; 153 6, an unarmed speci- 
men. 
MELANIA TERPSICHORE (Gould). 
Testa elongato-turrita, solidula, olivacea, plagis flexuosis fuscis picta, 
34 
