... shell fragment bears a few long and short NMMNH intercalated P-68443 ribs. No (Fig. suture 60H) is from visible ... fastigiate. give rise Strong to weak, umbilical low, rounded, bullae slightly flexuous prorsiradiate primary ribs ...
... shell , of which I have examined very many individuals . The Bermuda shell was known to Say . He wrote a descrip ... fastigiate than even H. septemvolva Nob . , and there is no obvious calcareous deposit on the labium , as in that ...
... shell , of which I have examined very many individuals . The Bermuda shell was known to Say . He wrote a descrip ... fastigiate than even H. septemvolva Nob . , and there is no obvious calcareous deposit on the labium , as in that ...
... shell , of which I have examined very many individuals . The Bermuda shell was known to Say . He wrote a descrip ... fastigiate than even H. septemvolva Nob . , and there is no obvious calcareous deposit on the labium , as in that ...
... Shell ovate - elongate ; spire elevated , fastigiate , apex acuminate : whorls seven , flattened on the sides , posteriorly rather roundly angulate and gradate- subcanaliculate ; body - whorl a little exceeding half the total length of ...
... Shell ovate - elongate ; spire elevated , fastigiate , apex acuminate : whorls seven , flattened on the sides , posteriorly rather roundly angulate and gradate- subcanaliculate ; body - whorl a little exceeding half the total length of ...
... shell , of which I have examined very many individuals . The Bermuda shell was known to Say . He wrote a descrip ... fastigiate than even H. septemvolva Nob . , and there is no obvious calcareous deposit on the labium , as in that ...
... Shell ovate - elongate ; spire elevated , fastigiate , apex acuminate : whorls seven , flattened on the sides , posteriorly rather roundly angulate and gradate- subcanaliculate ; body - whorl a little exceeding half the total length of ...
... Shell ovate - elongate ; spire elevated , fastigiate , apex acuminate : whorls seven , flattened on the sides , posteriorly rather roundly angulate and gradate- subcanaliculate ; body - whorl a little exceeding half the total length of ...
... fastigiate outline as in Reticulo- ceras davisi ( Pl . 2 , fig . 17 ) . Sinuous , bisulcate constrictions are prominent in the smaller specimens available . Shell sculpture consists of delicate closely spaced lirae ( 5 per mm across the ...