374 MAZATLAN UNIVALVES 



p. 78: Descr. Cat. p. 3. no. 13. Wood, 2nd. Test. Suppl, 

 pi. 3, f. 7. Fa/, in. Rumb. Eec. Obs. vol. ii. p. 334. Sow. 

 Conch. HI. pi. 104, f. 77Kien. Icon. Conch, p. 15, pi. 28, 

 f. 3. Eve. Conch. Icon. pi. 13, f. 60. Mice, in Zeit. f. Mai. 

 1851, p. 33, no. 112. C. B. Ad. Pan. Shells, p. 32, no. 6. 



Aricia arabicula,, H. fy A. Ad. Gen. i. 266. 



? + Cyprzea punctulata, <3W#, Zool. Journ. vol. i. p. 387. Sow. 

 Conch. III. pi. 4, f. 2QKien. Conch. Icon. p. 114, pi. 21, 

 f. 2. Desli. in Lam. An. s. Vert. vol. x. p. 563, no. 92. 

 (Panama, with C. arabicula, C. IB. Adams.) 



This shell differs essentially from A. Arabica in the concealed 

 spire, white teeth, and shape of the mouth and front, which 

 have a general resemblance to A. caput-serpentis. The varia- 

 tion in tint and markings is considerable ; some few diseased 

 specimens even presenting the aspect of A. obvelata. A very 

 large number were found, repaired after more or less severe frac- 

 tures. The largest specimen measures long. 1*45, lat.l'. 



An elongated sp. ,, 1'17, ,, '9. 



A transverse sp. ,, 1'19, "75. 



The smallest adult *84, '54. 



Hob. Acapulco, Humboldt fy Bonpland. St. Elena and Heal 

 Llejos, under stones, Cummg. Panama ; 7 sp. under stones 

 from 8 20 in. in diameter, at and just below low water mark 

 of neap tides ; C. B. Adams. S. W. Mexico, common ; 

 P. P. C. Mazatlan ; in extreme profusion ; L'pool Sf 

 Havre Col. 



Tablet 1749 contains 4 sp. young and adolescent. 1750, 5 sp. 

 dark, pattern indistinct. 1751, 5 do. distinct. 1752, 5 sp. 

 small size, dark. 1753, 5 sp. lighter, very small. 1754, 5 sp. 

 normal state. 1755, 5 sp. light, pattern distinct. 1756, 5 do. 

 indistinct. 1757, 4 do. very light.* 1758, 3 do. with opaque 

 whitish deposit. 1759, 1 sp. uniform greenish yellow, without 

 spots. 1760, 5 sp. greenish, light markings. 1761, 5 do. dark, 

 pattern distinct. 



Specimens shelving sides. 1762, 5 sp. sides orange, panther 

 pattern. 1763, 2 sp. with numerous spots and dots. 1764, 

 3 sp. spots large, few. 1765, 1 sp. spots small, numerous. 



* One of these appears to belong to the form C. punctulata : but the gradations 

 between it and the typical C. arabicula are so numerous and gradual that I am 

 unable to separate them. Mr. Gaskoin however, whose authority in this genus 

 is paramount, regards tbe species as distinct. 



