except that Cobbzus is slightly stouter and has fewer and coarser ribs on septate portion. CGS 10375 finer ribbing orad of last node Paired heavy ribs of bulloz but all ribs weak on nodose part BC. Ventro-lateral nodes strong on BC, die out on exposed part septate whorls BC These "Mabridge" forms differ from S. nodosus ver. guzdrzuquleris but little in form, though are more compressed laterally than Meeks similar guzdoeuqulevis (IX, pl. 25, fig 4). From this same specimen they 10