MAZATLAN UNIVALVES 467 
Tablet 2122 contains 3 sp. very rich dark shade.—2123, 3 sp. 
yellowish ground with dark markings.—2124, 3 do. markings 
lighter.—2125, 3 do. greenish ground, dark markings.—2126, 
3 do. lighter.—2127, 3 do. triangulation appearing.—2128, 3 do. 
triangles distinct.—2129, 3 do. greenish ground.—2130, 3 do. 
light flesh colour.—2131, 3 do. markings more scattered.— 2132, 
3 sp. markings interrupted in the middle.—2133, 3 sp. young.— 
2134, 2 sp. mended after fracture. 
Tablet 2135 contains 3 sp. of a solid variety, prevailing 
yellowish tint, markings faint.—2136, 3 do. markings very slight. 
594. Oxriva Ductosi, Rve. 
Conch. Ic. pl. 19, sp. 44, f. 44. 
Of this species only two small fresh specimens were found, 
which belong (so Miss Steere informs me) to the variety which 
has been described as O. Schumackeriana, Beck. It has the 
colouring of the dark variety of O. venulata, with the shape of 
O. reticularis ; but is at once known from both by the distant, 
strong parietal teeth. The few columellar plaits are uncolour- 
ed, while the band above is deeply stained. Long. ‘82, long. 
spir. °2, lat. °34, div. 70°. 
Hab.—Philippines and Society Island; Cuming.—Mazatlan ; 
extremely rare ; L’pool Col. 
Tablet 2137 contains the larger sp. 
Genus OLIVELLA, Swains. 
Treatise 1840, p. 322.—H. §& A. Ad. Gen. vol. i. p. 145. 
Olivina, D’ Orb. Voy. Am. Mer. p. 417. 
Glandinaria, Nutt. ms. 
Oliva, pars, auct. 
595. OLIVELLA UNDATELLA, Lam. 
Oliva undatella, Zam. in Ann. Mus. vol. xvi. 1810, p. 326, 
no. 55:—An. s. Vert. vol. x. p. 630, no. 58.—Ducl. Mon. Oliv. 
pl. 5, f.5—10 :—do. in Chén. Lil. Conch. pl. 6, f. 5—10 :—Zool. 
Beech. Voy. p. 131, pl. 36, f. 23, 26,27.— Rve. Conch. Ie. pl. 25, 
f. 73.—Mke. in Zeit. f. Mal. 1851, p. 24, no. 105.—C. B. Ad. 
Pan. Shells, p. 55, no. 39. 
