169 
more dilated than in the last) terminating in a small 
umbilicus ; body whorl not carinated. %§. Devon, on 
Alge. 
T Armatus. D. p. 829. (young.)—T. Catcar. 
Mont. Sup. p. 137. ¢. 29. f. 3.—Ch. f. 1786,7.— 
Detruinvta C. F. p. 312.—Whorls four, the upper 
ones depressed and forming a flat summit; pale pink, 
round, with large smooth lanceolate spines, radiating in 
straight lines from the body ‘and part of the second 
whorls, about thirteen in number; base convex, with 
a central cavity; aperture orbicular. +. Jona.— 
Possibly a young Rugosus. 
T. Decussatus. Mont. p. 322. ¢. 12. f. 4.—F. p. 
299,—An T. Petuucipus. Lin. T. 3. p. 66. t. 13. f. 
33,4.7—T. Arenaria. D. p. 839.—Subpellucid, 
somewhat glossy, white, the apex not very pointed ; 
whorls five. rounded, well defined, strongly striated 
longitudinally and decussated by extremely fine striz ; 
aperture suboval, contracted above, outer lip thin, mner 
lip not spreading. g%...0,012, Salcomb Bay, rare. 
T. Marearita. Lowe. in Z. J. 2. p. 107. t. 5. f. 
10,11.—F. p. 299.—HeEx1x M. Mont. Sup. p. 148. 
—Wern. Mem. 1, p. 408. #. 8. f. 5.—Marcarita 
H. 
