MAZATLAK UNIVALVES 241 



300. VlTEISELLA LIRULATA, 71. S. 



V. t. discoided, hand parvd, anfractibus iv. et dimidio, 

 quariim tres insculpti, regidariter augentibus, spiraliter tenue 

 liratis ; spird plamita, suturis conspiciiis, apeHwrd Irutundata, 

 umbilico maximo, anfractus monstrante. 



Distinguislied from V. monilifera by its large size, more 

 regular growtli, and somewhat coarser spiral lirse, which are 

 not decussated. The mouth in the only specimen found is 

 rather broken, but it appears to have been nearly round. It 

 gives evidence of having been a coloured shell, and may pos- 

 sibly be a Skenea. Long. 'Qr21, lat "085 by "065, div. 180. 



Sab. — jVIazatlan ; i dead sp. off Chama ; Upool Col. 

 Tablet 1151 contains the specimen. 



301. VlTEINELLA SUBQT7ADEATA, n. S. 



V. t. discoided, albd, seu subhyalind, planatd, Icevi, nilidd .■ 

 anfractibus iv. et quadrante ; interdum strid juxta suturam 

 impressam ; umbilico maximo ; anfractu ultimo prope umbili- 

 cum et infra j^erip/ieriam. subangulato ; aperturd suhquadratd, 

 anfr. penult, vix attingente, lahro ad suturam et in medio valde 

 siiiuato, piostice dilatato, excurvato. 



In shape like V. monilifera, but without sculpture. Though 

 smooth, the junction of the adult portion (one whirl and a 

 quarter) is clearly marked. The aperture is beautifully sinu- 

 ated in the middle and at the sutiire, -n'ith the labnun much 

 excurved between the two. The smallest specimen is "025 

 across. The largest measures long. '017, lat. "04 by '033. 

 Biv. about 175". 



ffab. — Mazatlan ; 16 sp. off Chama and Spondylus ; Upool Col. 



Tablet 1152 contains 4 sp. differing in age and texture. 



302. VlTRINELLA BTFILATA, 11. S. 



V. t. subdiscoided, anfractibus iv. et dimidio, rotundatis ; 

 anfractu ultimo tenuissime spiraliter striata, striis [duabus, 

 juxta et supra peripheriam majoribus ; umbilico maximo ; aper- 

 turd vix anfr. penult, attingente, vix subquadratd, labro ad 

 suturam et in medio sinuato, post ice excurvato. 



Differs from V. lirulata in the fineness of the scidpture, 

 tumidity and comparative elevation of the spire, and in the 

 development of two stria) above the rest. Of these, the larger 

 June 1856. x 



