Journal of conchology . ightlyreflected ; umbilical cleft narrow, almost concealed. Altitude 845 mm. Diameter 386 mm. Horizon: Woodston, Huntingdonshire, in marls and clays ofPleistocene age. This shell, though closely allied to Paludestrina ventfosa Montagu,of which we at first regarded it as an extreme form, seems topossess characteristics sufficient to separate it specifically. All ourleading conchologists to whom I have submitted specimens unite indeclaring it to be an entirely new species, quite distinguishable fromthe other members of the genus. It occurs in the greatest profusionthrough
Journal of conchology . ightlyreflected ; umbilical cleft narrow, almost concealed. Altitude 845 mm. Diameter 386 mm. Horizon: Woodston, Huntingdonshire, in marls and clays ofPleistocene age. This shell, though closely allied to Paludestrina ventfosa Montagu,of which we at first regarded it as an extreme form, seems topossess characteristics sufficient to separate it specifically. All ourleading conchologists to whom I have submitted specimens unite indeclaring it to be an entirely new species, quite distinguishable fromthe other members of the genus. It occurs in the greatest profusionthroughout the three feet thick deposit of dark estuarine clay whichlies just above the shell-bearing lacustrine marls, along with manyvalves of Cardiuvi ediih and small numbers of Liuincea pereger,Planorbis spiroibis and immature Hygromice. It also occurs, butnot nearly so plentifully, in the lower marls. It was evidently asabundant in this Pleistocene estuary as Paludestrina stagnalis Basteris to-day in many similar habitats. Paludestrina. dcani in the Manchester INIuseum. Photo, by J. ]lilfrid Jackson. I have great pleasure in being permitted to give to this shell thespecific name of dea7ii., as a mark of deep gratitude to Mr. John DavyDean, of Lancaster, one of the most accurate and painstaking of ouryounger conchologists, who first introduced me to the study of con- KENDALL : PLEISTOCENE MOLLUSCA IN NORTH HUNTINGDONSHIRE. 9I chology, and who has been for a period of years consistently myguide, philosopher and friend in matters conchological, and the morejustly so as he was the first to point out to me that this shell was quitedistinct from all the known British Pahidestrinidce. 7, Unio littoralis Lamarck. This large bivalve occurs frequently in the deposit in a more orless fragmentary condition, coming out in large scales of frj^gile, brightpearly material. Unfortunately my trowel pierced right through thetwo perfect specimens which I have met with, but the marl held
Size: 2623px × 952px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorconcholo, bookcentury1800, bookdecade1870, bookyear1879
