MAZATLAN UNIVALVES 241 
300. ViITRINELLA LIRULATA, 7. 8. 
V. t. discoided, haud parva, anfractibus iw. et dimidio, 
quarum tres tnsculpti, regulariter augentibus, spiraliter tenue 
liratis ; spird planatd, suturis conspicuis, apertura ?rotundata, 
umbilico maximo, anfractus monstrante. 
Distinguished from V. monilifera by its large size, more 
egular growth, and somewhat coarser spiral lire, which are 
not decussated. The mouth in the only specimen found is 
rather broken, but 1 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. 
-Hab.—Maazatlan ; 1 dead sp. off Chama; L’pool Col. 
Tablet 1151 contains the specimen. 
301. VITRINELLA SUBQUADRATA, 2. S. 
V. t. discoided, alba, seu subhyalind, planata, levi, nitida ; 
anfractibus iv. et quadrante ; interdum striad juacta suturam 
impressam ; umbilico maximo; anfractu ultimo prope wmbili- 
cum et infra peripheriam subangulato ; aperturd subquadrata, 
anfr. penult. vie attingente, labro ad suturam et in medio valde 
sinuato, postice 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 suture, with the labrum much 
excurved between the two. The smallest specimen is °025 
across. The largest measures long. ‘017, lat. ‘O4 by °033. 
Div. about 175°. 
Hab.—Mazatlan ; 16 sp. off Chama and Spondylus ; L’pool Col. 
Tablet 1152 contains 4 sp. differing in age and texture. 
302. VITRINELLA BIFILATA, 7. S. 
V. t. subdiscoided, anfractibus iv. et dimidio, rotundatis ; 
anfractu ultimo tenwissime spiraliter striato, strits duabus, 
juata et supra peripheriam majoribus ; umbilico maximo ; aper- 
turd vie anfr. penult. attingente, vie subquadratd, labro ad 
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 strie above the rest. Of these, the larger 
June 1856. P L 
