246 MAZATLAtt UNTYALVEP 



309. VlTBINELLA CARINULATA, n. S. 



TT, t> snbglobosd, subdepressd, tenui, subdiapkand ; suturd im 

 pt*essd ; umbilico hand magno ; regione umbilicali magnd, 

 concavd, radiatim rugosd ; anf . ult. carinulis v. haud promin- 

 entibus, quarum duce infra et supra peripheriam haud planatam 

 site sunt, dues in spird haud planatd, alter a regionem umbili- 

 ealem describens ; sulcis spiralibus in basim, carinulis simu- 

 loMtibus ; aperturd subelongatd, ad basim angulatd, avfr. penult, 

 pa-rum attingente. 



Known from V. cincta by the non-prominence of the keels, 

 rounding and keeling of the spire, and greater elevation. The 

 only specimen found is not mature, scarcely a whirl being 

 formed of the adult portion. Long. '22, lot. '03 by '023. 

 div. circ. '165. 



Hal). Mazatlan ; 1 sp. off. Spondylus ; Upool Col. 

 Tablet 1160 contains the specimen. 



310. PVlTEINELLA NATICOIDES, n. S. 



? V. t. subglobosd, subdepressd, nitidd, subdiapkand, albd ; 

 anfractibus iv. et triente, quarum primi convexiusculi sunt, 

 ultimi sutura, vix impressd ; striulis incrementi exillimis, max- 

 ime suturam versus, haud conspicuis ; umbilico prof undo, an- 

 gusto, a carind extante callosd definitd ; aperturd anfr. penult, 

 parum attingente, labio subexpanso, a carind angulato. 



This curious shell might be either called by the above name 

 or Natica vitrinelloides, as it partakes of the characters of 

 both genera ; though the texture and difference of convexity 

 in the first three whirls incline the balance in favour of the 

 former genus. Thus the shell alone cannot decide between 

 animals widely removed. It looks like a flattened, white, 

 glossy Natica, with the straight umbilicus bounded by a con- 

 spicuous keel which runs into the aperture. Long. '03, lat. .047 

 by '04, div\ 160. 

 Hab. Mazatlan; 2 sp. off Spondylus & Chamar ; L'pool Col. 



Tablet 1161 contains the largest specimen. 



311. PYlTEINELLA PLANOSPIEATA, n. S. 



?V. t. magnd (quoad genus), tenuissimd, subdiaphand, albd; 

 spird planatd, ad carinas valde angulatd, spiraliter striatd ; 

 ad basim tumente, convexd, profunde sed ncn late umbilicatd ,- 



