MAZATLAN UNIVALVES AOL 
interstitiis latis, spiraliter vix striulatis, bast vix striata ; 
apertura subpyriformad ; labro acuto, secundum costas vx 
stnuato : labio inconspicuo. 
Mangelia acuticostata, Proc. Zool. Soc. June, 1856. 
Resembles M. neglecta, C. B. Ad. which however is de- 
scribed as having an elevated spiral line on the middle of the 
whirls, and basal strie. Zong. ‘138, long. spir. ‘074, lat. ‘07, 
div. 35°. \ 
Hab.—Mazatlan ; 1 sp. off Spondylus ; L’pool Col. 
Tablet 1914 contains the specimen. 
Genus CITHARA, Schum. 
Ess. no. 106, 1817.— Woodw. Man. p. 115. 
Cythara, H. § A. Ad. Gen. vol. i. p. 98. 
Mangelia, Rue. Conch. Ic. (non Risso) maxima pars. 
474, ?CrtHARA ————, sp. ind. 
Tablet 1915 contains a brokenyghell with 7 long, straight, 
sharp ribs and very crowded spifél strie ; mouth sublinear ; 
labrum thickened, except at the notch. There is no trace of 
teeth within. 
Hab.—Mazatlan ; 1 sp. off Spondylus ; L’pool Col. 
Famity CONIDZ. 
Genus CONUS, Linn. 
The Mazatlan Cones do not appear to be rich either in 
species or individuals ; nevertheless, if not valuable to collec- 
tors, they were interesting through possession of the epidermis, 
and often of the opercula. These are very small for the shell, 
elongated and narrow ; with the apex terminal, usually decol- 
lated, and often much broken. When repaired, as in ether 
families, it sometimes assumes the concentric type. 
475. CoNUS REGULARIS, Sow. 
Conch. Ill. pl. 29, f. 29, pl. 36, f. 45.—Rve. Conch. Ic. pl. 26, 
sp. 126.—Lam. An. s. Vert. vol. xi. p. 132, no. 189.— Hien. 
Icon. Conch. p. 124, no. 103, pl. 23, f. 3, var.—Jke. in Zeit. 
