HELIX CORYDA. 43 



or elevated, conoiclal, apex obtuse, sutures well marked ; whorls 5, 

 slightly convex, moderately widening, the last more or less depressed, 

 rounded at the periphery, rather flattened beneath, abruptly more or 

 less deeply deflexed anteriorly ; aperture very oblique, wide oblong, 

 truncate ; peristome strong, labiate within, its margins but slightly 

 converging; outer lip sub-expanded; baso-columella lip broad, white, 

 flat, thickened within, inserted in the center of the base; parietal 

 wall the same color as the base, 



Alt. 17, diam. 21 mill.; alt. 13, diam. 23 mill.; alt. 11, diam. 16 



mill. 



Eastern Cuba. 



H. alauda FER. Hist., t. 103, f. 2, 3, ; Prodr. 319. PFR. Monogr. 

 i, p. 268 ; v, p. 303 ; Conchyl Cab. t. 71, f. 12. d'ORB. Moll. Cuba, i, 

 p. 149, t. 9, f. 8-10. REEVE, f. 261. ARANGO, Fauna Mai. Cu- 

 bana p. 72. - H. strobilus FER., Prodr. 317, Hist. t. 103, f. 1. PER. 

 Symb. iii, p. 72 ; Conchyl. Cab. t. 72, f. 22, 23. REEVE, f. 580. IT. 

 mamilla LEA, Obs. i. p. 166, t. 19, f. 64. H. purpuragula LEA, loc. 

 cit.p. 163 t. 19, f. 60. H. avellana FER. Hist. t. 103, f. 4, 5. H. 

 lie-be DESH. in Per. Hist, i, p. 211, t. 37 A, f. 5. H. bizonalis GRAT. 

 Actes de la soc. Lin. de Bord. xi, p. 412, f. 7. ( H. pudibunda Beck 

 and H. solida MKE. teste Pfeiffer). 



Arango is undoubtedly right in declaring that the separation of 

 this form into several species cannot be maintained. There is the 

 greatest variation in form, size and color-pattern, but the extremes 

 are united in every direction by intermediate specimens. 



The coloration may be according to any of the patterns described 

 below, or may be any combination of two or more of them. 



(l.)Pure white with or without pale yellowish streaks; often 

 quite globose, the aperture frequently deeply deflexed above. 



( 2.) White or yellowish, with two broad spiral zones of deep 

 brown. 



(3.) Whitish, with very numerous, irregular, dense, deep brown 

 lines following the incremental striae ; heavy, globose, dark within 

 the outer lip, peristome heavy, white. The outside coloration of 

 this form ( which is not figured on the plate ) is very similar to that 

 of H. dennisoni PFR. but the parietal wall is striped like the base of 

 the shell. A modification of this type has the longitudinal streak- 

 ing pale chestnut-yellow, interrupted by spiral white bands. It is 

 quite globose. Another modification has the same longitudinal 

 streaking, streaks more confluent, less distinct, often pale chestnut 



