MAZATLAN FNITALVES 229 



287. UVANILLA INEEMIS, Gmel. 



U.t. " U. olivacece" simillimd ; sed sculptura fortiore,rugis 

 in spird distantiorihus ; lined granularum intetmd in basi vix 

 monstrarde ; regione umhiUcali albd, cavitateprofundd, carina 

 spirali acutd circumeunte, extus vix excavatd ; callositate tenui 

 diffusa. 



Trochus inermis, Ghnel. p. 3576, no.QI.—Schroet.Einl.Tol.i. 



p. 719, no. 100— Dilho. Bescr. Cat. vol. ii. p. 787, no. 67.— 



Lam. An. s. Vert. vol. iv. p. 127, no. 17.—Kien. Icon. CoTwh. 



pi. 14, f. 2, 2 a. 

 =TroclLiis olivaceus, Phil, in Zeit. f. Mai. 1848, p. 188: non 



Gra>/ in Wood. 



This shell, -n-hicb. Avas brought in some abundance by Capt. 

 Kellett, is not the T. olivaceus, Wood, as Phil, seems to have 

 supposed. There can hardlj^ be a doubt that it is the species 

 figured by Xien. and therefore, it is presumed, of Lam. 

 Whether it be that of the Linntean writers, can scarcely be 

 determined, when the differences are so slight. 



It exactly remembles U. olivacea in almost all respects : 

 but has coarser, more distant rugse on the body of the whirls ; 

 and in the umbilical region is white, more resembling U. un- 

 guis. Base V ith the inner row of granules scarcely developed : 

 umbilicus deeply scooped, covered with a thin diffused callus, 

 bounded by a sharp spiral ridge, scarcely scooped outside. 

 The yoimg shell has a fine keel in the place of the inner row 

 of nodules, marked off by two faint spiral grooves, on the 

 jnedial portion. Whether it be reaJly distinct from U. oliva- 

 cea must await a knowledge of the operculum, and a compari- 

 son of additional specimens. The smallest sp., of 6 whirls, 

 measures long, (apex to basal wing) "86, lat. "98, div. 80". 

 J5aJ.— Mazatlan ; 2 young sp. only ; L'pool Col. 



Tablet 1096 contains the youngest (mo^t characteristic) sp. 



288. TJvANiLLA UNGCJis, Mawe. 



Trochus unguis, Maioe, in Wood Ind. Test. Suppl. p. 16, no. 2, 

 pi. b.—Rve. Conch. Syst. vol. ii. p. 165, pi. 217, f Q.—Kien. 

 Icon. Conch, pi. 13, f. 1 (max.) 



Turbo unguis, Besh. in Lam. An. s. Vert, vol ix. p. 224, no. 42. 



= Turbo digitatus, Besh. Mag. de G-uer. 1841, pi. 36. 



= Trochus amictus, Val. Voy, Venus. 



June 1856. «, 



