MAZATLAN UNIVALVES 257 



Specimens displaying changes of wrinkles. Tablet 1185 con- 

 tains 2 sp. cross-barred, or T-shaped. 1186, 3 sp. curled round, 

 P- or B-shaped. 1187, 2 sp. 7 -shaped. 1188, 2 sp. obscurely 

 F-shaped. 1189, 2 sp. V'^P 6 ^- H90, 1 S P- :--shaped. 

 1191, 2 sp. wrinkles very slightly developed. 



Tablet 1192 contains 3 abnormal opercula. Normal ones are 

 seen with the shells. 



\ 327. NEEITA BEENHABDI, He'd. 



Petit, Journ. Conch. 1850, vol. i. p. 285. five. Conch. Ic. pi. 12, 



sp. 57, f. 57, , b. 

 =JSTerita funiculata, Wee. in Zeit.f. Mai. 1850, p. 169, no. 22. 



(dated "April, 1851.") 



? = Nerita, sp. ind. a, C. B. Ad. Pan. Shells, p. 205, no. 309. 

 Theliostyla Bernhardi, If. $ A. Ad. Gen. i. 380. 



This unpretending, but not inelegant species represents on 

 the Pacific coast the common W. Indian N. tessellata^, from 

 which it differs in the more numerous spiral ribs and columellar 

 granules, and in the irregular style of painting. Shell very 

 variable ; with the spire not a little exserted, or quite flat, the 

 expanded labrum very rarely even projecting beyond. Ribs 

 more or less numerous, generally scabrous, sometimes nearly 

 smooth ; on shells of the same size, they vary from 2 to 5 in 

 the tenth of an inch. Colour black, very irregularly spotted 

 with a variable number of granules, sometimes large, sometimes 

 small : teeth 4, very small and central, sometimes running into 

 lines on the lip, sometimes conspicuous, sometimes nearly 

 obsolete. Operculum ashy, very finely shagreened outside, 

 with a horny layer outside the outer edge, and an inner sinus 

 nearer the middle than in the last species. Tooth scarcely 

 recurved. The largest specimen measures long. '54, lat. '59, 

 div. 120 180. 

 Hab. Peru, Ciiming. Panama ; in extreme profusion, on 



rocks and stones from half- tide level to the low water mark 



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



Mazatlan ; not uncommon ; ISpool Sf Havre Coll. 



Tablet 1193 contains 7 sp. various ages. 1194, 7 do. shewing 

 variations in colour. 1195, 6 do. varying in height of spire. 

 1196, 6 do. young, shewing variations in sculpture. 1197, 6 do. 

 varying in closeness of ribs. 1198, 10 do. shewing changes in 

 the labial teeth and granulations, 1199, 6 separate opercula ; 

 others being in the shells. 



