Abstract
The Lower Productus Limestone of West Pakistan yields an abundant and well-preserved fauna of fusulinid Foraminifera. The fusulinids are found in the lower part of the Amb Formation of the Zaluch Group of Early Permian age described by Teichert in 1966. About 50 samples of the fusulinids, collected by C. Teichert in 1961-62 and R. E. Grant in 1964-65, contain the genus Monodiexodina. Each sample of fusulinids is relatively homogeneous in morphologic characters, having a fairly normal distribution of values through a limited range for most characters. There are large differences between many of the samples with little or no overlap in the dimensions of some characters at specified volutions. Distinct species could be described by conventional methods based on a few speci ens or even on reasonably large samples, and statistically meaningful differences could be demonstrated. Cutbill and Forbes' 1967 discussion on the significance of the prolocular diameter and its effect on comparisons by volution has led to a re-evaluation of the data on these samples. Comparison of measurements at equal radii instead of by volution brings out many similarities between samples. For example, two samples that are quite distinct when compared by volution cannot be distinguished at equal radii. The biologic significance of the prolocular diameter needs reconsideration. Microspheric and megalospheric forms End_Page 525------------------------------ are accepted as representing the same species, and Le Calvez and others have shown that several megalospheric generations can develop between microspheric generations. The megalospheric generation groups may not all develop the same size of proloculus. One species could be represented by microspheric forms as well as a wide range of megalospheric forms. Apparent differences which are related directly to prolocular diameter are not considered sufficient evidence for specific discrimination. End_of_Article - Last_Page 526------------
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