174 CHLOROSTOMA. 



TrocJiH.i (iter Lesson, Voy. de la Goqidlle, p. 344, t. 1(3, f, 2 (1826). 

 — D'Orbigny Voy. dans VAmcr. merid., p. 409. — Gould, U. S. 

 Explor. Exped., t. 211. — Gay, Hist, fisica y polit. de Chile, viii, p. 

 142, t. 4, f. 2.— Philippi, Conchyl. Cab., p. 198, t. 30, f. 1.— 

 Fischer, Coq. Viv. (gen. Turbo), p. 109, t. 30, f. 2. 



The largest American Chlorostoma. Some specimens are mucli 

 depressed. The dimensions are frequently smaller than above 

 given. Fisher gives alt. 50, diam. 54 mill, as the measurements of 

 a specimen in the Paris collection. 



Var. MCESTUM Jonas. PI. 28, figs. 50, 51. 



This form diflfers from the preceding in being smaller, narrower 

 and more elevated. Alt. 28, diam. 26-28 mill. 



Coast of Chili. 



All the specimens I have seen are very much eroded. 



T. mcestus Jonas, Zeitschr. f. Malak., 1844, -.p. 113. — Philippi, 

 Conchyl. Cab., p. 199, t. 30, £ 2.— Gay, Hisf.fis. y polit. Chile, t. 4, 

 f. 3.— Fisc!HER, Coq. Viv., p. 276, t. 91, f 1. 



C. EURYOIMPHALUS Jonas. PI. 27, figs. 39. 



Shell umbilicate, conical, solid, black or purplish ; spire elevated, 

 conical ; whorls about 6, somewhat convex, nearly smooth, the last 

 more or less angulate at the periphery, sometimes obtusely bicar- 

 inate ; aperture rather small, oblique, columella arcuate, spreading 

 above in a white callus ; und)ilicus white within, somewhat funnel- 

 shaped, bearing a spiral rib which terminates in a denticle in the 

 middle of the columella. Alt. 28-33, diam. 28-33 mill. 



Coast of Chili. 



T. euryomphalus Jonas, Zeitschr. f. Malak., 1844, p. 115. — 

 Philippi, Conchyl. Cab., p. 155, t. 25, f. 7. — Fischer, Coq. Viv., p. 

 107, t. 31, f 4. — Turbo Inctaosus var., Kieni:r, Species, t. 31, f 4. 

 — Trochus kieneri Hupe, in Gay, Hist. fis. y polit. Chile, viii, p. 

 144, t. 4, f 1. 



Allied to the following species, but narrower, more elevated, and 

 much less distinctly carinated. It bears about the same relation to 

 C. luctuosum that C. moestum does to C. atrum, and should jier- 

 haps rank as a variety of that species. 



C. luctuosum d'Orbiguy. PI. 28, figs. 45, 46. 



Shell broadly umbilicate, depressed conical, solid, heavy, black 

 or purplish ; spire more or less depressed, sutures linear ; whorls 5 



