b 



MAZATLAN UNIVALVES 257 



Specimens displaying changes of wrinkles. — Tablet 1185 con- 

 tains 2 sp. cross-barred, or T-sbaped. — 1180, 3 sp. ciirled round, 

 P- or 3-sbaped. — 1187, 2 sp. 7-sbaped.— 1188, 2 sp. obscurely 

 F-sbaped. — 1189, 2 sp. V-siiapcd.— 1190, 1 sp. :--sbaped.— 

 1191, 2 sp. -nTinlilea very sligbtly developed. 



Tablet 1192 contains 3 abnormal opercula. Normal ones are 

 seen with the sbells. 



327. Neeita Beenhaedi, Sdcl. 



Petit, Journ. Conch. 1850, voL i. p. 285. — Rve. Conch. Ic. pi. 12, 



sp. 57, f. 57, a, b. 

 =Nerita funiculata. Mke. in Zeit.f. Mai. 1850, p. 169. no. 22, 



(dated "April, 1851.") 

 P=Nerita, sp. iud. a, C. B. Ad. Fan. SMI.-, p. 205, no. 305. 

 TbeHostyla Bernbardi, M. cj- A. Ad. Gen. i. 380. 



This unpretending, but not inelegant species represents on 

 the Pacific coast tbe common W. Indian N. tessellata? from 

 wbicb it differs in tbe more numerous spu'al ribs and colunlellar 

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

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

 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. Coloiu' 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 horuy layer outside the outer edge, and an inner sinus 

 nearer the midiUe than in the last species. Tooth scarcely 

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

 div. 120"— 180". 



Sah. — Peru, Cuming. — 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 ; L'pool 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. — 



119G, 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. 



