MAZATLAN UNIVALVES 241 



300. VlTEINELLA LIEULATA, n. S. 



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

 quarum tres insculpti, regulariter augentibus, spiraliter tenue 

 liratis ; spird planatd, suturis conspicuis, aperturd ?rotundatd, 

 umbilico maxima, anfractus monstrante. 



Distinguished from V. monilifera by its large size, more 

 regular growth, 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. '027, lat '085 by '065, div. 180. 

 Hal. Mazatlan ; 1 dead sp. off Charna ; ISpool Col. 



Tablet 1151 contains the specimen. 



4- 301. VlTRINELLA STJBQUADRATA, n. S. 



F! t. discoided, alba, sew subliyalina, planatd, l&vi, nitidd; 

 anfractibus iv. et quadrante ; inter dum stria juxta suturam 

 impressam ; umbilico maximo ; anfractu ultimo prope umbili- 

 cum et infra peripheriam subangulato ; aperturd subquadratd, 

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

 sinuato, postice dilatato, excurvato. 



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

 smaoth, 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 suture, with the labrum much 

 excurved between the two. The smallest specimen is '025 

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

 Div. about 175. 

 Hab. Mazatlan ; 16 sp. offChama and Spondylus ; L'pool Col. 



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



302. VlTRINELLA BTFILATA, n. S. 



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

 anfractu ultimo tenuissime spiraliter striato, striis 'duabus, 

 juxta et supra peripheriam majoribus ; umbilico maximo ; aper- 

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

 suturam et in medio sinuato, postice excurvato. 



Differs ' from V. lirulata in the fineness of the sculpture, 

 tumidity ' and comparative elevation of the spire, and in the 

 development of two striae above the rest. Of these, the larger 

 June 1856. x 



