MAZATLAN UNIVALVES 491 



vol. ii. p. 330. Desk, in Hue. Meth, vers. ii. p. 251, no. 1. 



Blainv. Mai. i. 29, f. 3 (teste Desk. : f. 23, test. C. B. Ad.) 



Eve. Conch. Syst. vol. 2, p. 218, pi. 257, f. 1 (male , C. B. 



Ad.) Duel, in Chnu, III. Condi, pi. 5, f. 7, 8. Kien. Icon. 



Ctadl.p.3,pl.l, f. !.(!, excl.) B. -M". Cat. D' Orb. Moll. 



p. 39, no. 342. Iffo?. in 20ft./ JfaJ. 1847, p. 182, no. 18. 



C. B. Ad. Pan. Shells, p. 98, no. 102. 



Buccinum stroinbiforme, Wood, Ind. Test. Suppl. pi. 4, f. 18. 

 Var. ? = Columbella gibbosa, Val. Rec. Obs. vol. ii. p. 831. 



Chen. HI. Conch, pi. 5, f. 5, 6.* 



Although Sowerby states that C. major is easily distinguished 

 from this species, and says truly of picked specimens, yet 

 C. major is so variable in its shape and size that it is not im- 

 possible that this may be a permanent variety of that species 

 as (v. v.) Kiener supposes. At the same time, as Deshayes 

 remarks, the differences, though slight, acquire importance by 

 their constancy. The present form is somewhat rounder in 

 the spire ; with the pattern developing streaks instead of 

 spots ; having the mouth more or less tinged with orange ; and 

 also (what appears to be the most trustworthy character) with 

 the radiating ridges in the epidermis, finely serrated by spiral 

 lines all over, and not at the upper portion only, as in C. major. 

 The size is more constant than in that species, adults being 

 never found either so large or so small. The opercula appear 

 exactly like those of C. major, both in the normal and abnor- 

 mal conditions. The frequency of the latter, while the shell is 

 quite perfect, shews that the animals are peculiarly liable 

 (in both of the species) to pedal injuries. A broad specimen 

 measures long. *95, long. spir. '28, lot. '62, div. 80?. 



A slender sp. I'Ol, *37, '62, 70. 

 Sab. Acapulco, Humboldt fy Bonpland. Isle of Muerte, 



Cuming. Payta, Peru, Fontaine, D'Orbigny. Taboga, 



1 specimen, C. B. Adams. Mazatlan, Melchers. Do. ; not 



uncommon among C. major ; L'pool Col. 



Tablet 2335 contains 3 sp. young. 2336, 5 sp. broad form. 

 2337, 6 do. normal state. 2338, 2 do. acuminate. 2339, 4 sp. 

 approaching C. major, yellow colour scarcely developed. 2340, 

 4 sp. with opercula in situ, normal and abnormal , also loose 

 opercula. 2341, 2 sp. shewing colour under epidermis. 



* As this shell is figured with a yellow month and light sp ots on the back, it i 

 difficult to say whether it is intended for a variety of C. Btrombiformrs or of 

 C, major. 



