MAZATLAN UNIVALVES 471 
congeners from the W. Indies, the differences appear extremely 
slight. The spire is rather narrower in the upper whirls, pure 
white; parietal callosity rather smaller; lower columellar 
plaits ‘rather more projecting, especially in the young shell. 
Spire with 7 whirls, and a faint line of opaque white just below 
the suture. Long. 25, long. spir.*1, lat. 09, div. 45° 
Hab.—Panama; 4 sp. among drift; C. B. Adams.—Mazatlan ; 
traces of 20 sp. off Chama and Spondylus ; L’pool Col. 
Tablet 2187 contains 2 perfect specimens, young and old. 
600. OLIvELLA DaMa, AMawe. 
Voluta Dama, Mawe, in Wood, Suppl. pl. 5, f. 37. (1828.) 
Oliva lineolata, Gray in Zool. Beech. Voy. p.131. (1839.)— 
Rve. Conch. Ie. pl. 23, f. 63. 
Oliva purpurata, Swains. Zool. Ill. pl. 2, f.1: teste Hanl. in 
Wood, ed. 2, p. 212. 
Oliva gracilis, Ducl. Monogr. Oliv. pl. 1, f. 17, 18. 
Olivella lineolata, H. & A. Ad. Gen. i. 146. 
This shell is remarkable for its rich gloss, elevated spire and 
yet stumpy growth, rich violet within the mouth, and great 
twist of the columella inside, not visible in the front view. 
The long spire is nearly covered with a thick enamel; and the 
body whirl is painted with olive brown, orange or faint gray, 
leaving a white pattern more or less triangulated, with long 
infrasutural lines. The labrum is not often found quite per- 
fect, and is much advanced in the middle. The largest speci- 
men measures long. ‘95, long. spir. ‘44, lat. °38, div. 50°. 
Acbroad: sis as 53.0827 0, e, 92, 5430") BOY eg One 
A slender sp. ,, ‘8, a 238s. bes yt SORA alee 
Hab.—Mazatlan ; abundant; L’pool Col. 
Tablet 2188 contains 10 sp. dark olive brown tint.—2189, 9 do. 
lighter shade.—2190, 5 sp. flesh colour.—2191, 3 sp. orange 
tint.—2192, 5 sp. grey tint.—2193, 2 sp. almost white; one 
scarcely displaying either pattern or violet mouth.—2194, 3 sp. 
shewing interior.—2195, 3 sp. slender form.—2196, 3 stumpy 
form.—2197, 2 sp. mended after fracture. 
601. OLIVELLA zonaLis, Lam. 
Oliva zonalis, Lam. An. s. Vert. vol. x. p. 631, no. 61 :—Azn. 
p. 827, no. 58.—Gray, in Zool. Beech. Voy. p. 131, pl. 36, 
