Journal of conchology . and tolerably accurate evaluation are given in Table VI. interms of the major diameter. The shells are those in the 7 and 8 in each LocalityBansteadMarpleBicknorTremadoc The differences of conoidity, closeness of whorls, relative size oflast whorl, etc., are evidently not very great, though the method of 1 Large specimens everywhere seem to have a relatively wider umbilicus. 2 There is no obvious growth change in these figures. The 6 mm. group of Bansteadhelvetica gives loo, 90, 53, 35 ; the 5 mm. group igo, 8g, 51, 34 : the 4 mm. group 100, 89, 52, 3
Journal of conchology . and tolerably accurate evaluation are given in Table VI. interms of the major diameter. The shells are those in the 7 and 8 in each LocalityBansteadMarpleBicknorTremadoc The differences of conoidity, closeness of whorls, relative size oflast whorl, etc., are evidently not very great, though the method of 1 Large specimens everywhere seem to have a relatively wider umbilicus. 2 There is no obvious growth change in these figures. The 6 mm. group of Bansteadhelvetica gives loo, 90, 53, 35 ; the 5 mm. group igo, 8g, 51, 34 : the 4 mm. group 100, 89, 52, 35. Table VI, Majordiameter Minordiameter Majoraltitude Minoraltitude Numberof whorls 100 ... 88 53 ?• • 35 •• . 48 100 ... 87 55 •• . 36 .. • 47 100 ... 89 55 . 36 .. • 49 100 ... 88 54 •• • 35 ?• • 47 302 JOURNAL OF CONCHOLOGY, VOL. I4, NO. lO, APRIL, I915. comparison is one of considerable delicacy.^ Relatively speaking theBanstead shells are flatter, the Bicknor most closely coiled (the.
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Keywords: ., bookauthorconcholo, bookcentury1800, bookdecade1870, bookyear1879
