458 MAZATLAN UNIVALVES 



f. 11. — Schuh. Sf Wagn. in Chemn. Suppl. p. 150, pi. 2-33, 



f. 4096.— C. B. Ad. Pan. SheUs,no. 68, p. 75. 

 Monoceros cingrilatiis, Jilke. in Zeit.f. Mai. 1850, p. 180, no. 46. 

 Buccinum cingulatum, Wood, Ind. Test. pi. 24, f. 167. 

 Turbinella cingulata, Kien. Icon. Conch, p. 36, pi. 20, f. 1. — 



Less. Rev. Zool. Jul. \%-\1.—Kust. Conch. Cah. p. 31, pi. 7, f. 8. 



This remarkable sbeU is distinguished at once from ^lono- 

 ceros by its plaited columella as in Lathirus, and its very strong, 

 twisted, unguiform operculum which can scarcely be distin- 

 guished from that of Turbinella cfestos. The labrum has a 

 broad shallow posterior sinus, and two deep narrow ones on 

 each side of the stoutly projecting horn (sometimes '65 long). 

 It is internally faintly lirate, much advanced in the middle 

 (to the level of the horn), serrated at the edge, where it is 

 tessellated by the extremities of the darker bands. The shell, 

 substantially white with broad and fine dark bands, is covered 

 with a smooth, adherent, brown epidermis; and is almost 

 always encrusted with coralline, Vermetidte, &c. Labium 

 thick, cornigated near the plaits, with an infrasutural lengthen 

 ed tooth, forming a slight sutural canal. Spire rather elevated 

 or depressed. Shoulder somewhat rounded, or sharply keeled 

 The largest sp. measures Zon/7. 2"38, 1, sp. '94, lat. 1*78, div. 80" 

 An elevated sp. „ 1-8, „ '88, „ 1-24, „ 70" 



A depressed sp. ,, 1"72, ,, '54, „ 1"3, „ 90". 



Sah. — ^W. Mexico, Hwmholdt Sf Bonpland, teste Lam. non 

 Val. — Panama ; in clefts of rocks at low water ; Cuming. — 

 Do. and Taboga, not uncommon ; C. B. Adams. — Mazatlan ; 

 extremely abundant ; L'pool ^' Havre Coll. 

 Tablet 2080 contains 3 sp. shoulder somewhat rounded, ele- 

 vated. — 2081, 4 do. normal, (one with operculum.) — 2082, 3 do. 

 depressed. — 2083, 3 sp. shoulder sharply angulated, elevated. — 

 2084, 3 do. normal.— 2085, 3 do. depressed.— 2086, 2 sp. lip 

 mended after fracture.— 2087, 2 sp. horn in process of renewal. 



Genus FASCIOLAEIA, Lam. 



584. Fasciolaeia peixceps, Sow. 



Sow. TanTc. Cat. App. p. 16.—Xien. Conch. Ic. p. 6, no. 4, 

 pi. 12, \Z.— Rve. Conch. Si/st. vol. ii. p. 184, pi. '2?>\.—Lam. 

 An. s. Vert. vol. ix. p. 436, no. \0.—Ml-e. in Zeit. f. Mai. 

 1851, p. 17, no. 82. 



